tor-browser

ZonedDateTime.cpp (96290B)

---

/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*-
* vim: set ts=8 sts=2 et sw=2 tw=80:
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#include "builtin/temporal/ZonedDateTime.h"

#include "mozilla/Assertions.h"
#include "mozilla/Maybe.h"

#include <algorithm>
#include <cstdlib>

#include "jspubtd.h"
#include "NamespaceImports.h"

#include "builtin/intl/DateTimeFormat.h"
#include "builtin/temporal/Calendar.h"
#include "builtin/temporal/CalendarFields.h"
#include "builtin/temporal/Duration.h"
#include "builtin/temporal/Instant.h"
#include "builtin/temporal/PlainDate.h"
#include "builtin/temporal/PlainDateTime.h"
#include "builtin/temporal/PlainMonthDay.h"
#include "builtin/temporal/PlainTime.h"
#include "builtin/temporal/PlainYearMonth.h"
#include "builtin/temporal/Temporal.h"
#include "builtin/temporal/TemporalParser.h"
#include "builtin/temporal/TemporalRoundingMode.h"
#include "builtin/temporal/TemporalTypes.h"
#include "builtin/temporal/TemporalUnit.h"
#include "builtin/temporal/TimeZone.h"
#include "builtin/temporal/ToString.h"
#include "gc/AllocKind.h"
#include "gc/Barrier.h"
#include "gc/GCEnum.h"
#include "js/CallArgs.h"
#include "js/CallNonGenericMethod.h"
#include "js/Class.h"
#include "js/ErrorReport.h"
#include "js/friend/ErrorMessages.h"
#include "js/Printer.h"
#include "js/PropertyDescriptor.h"
#include "js/PropertySpec.h"
#include "js/RootingAPI.h"
#include "js/Value.h"
#include "vm/BigIntType.h"
#include "vm/BytecodeUtil.h"
#include "vm/GlobalObject.h"
#include "vm/Int128.h"
#include "vm/JSAtomState.h"
#include "vm/JSContext.h"
#include "vm/JSObject.h"
#include "vm/PlainObject.h"
#include "vm/StringType.h"

#include "vm/JSObject-inl.h"
#include "vm/NativeObject-inl.h"

using namespace js;
using namespace js::temporal;

static inline bool IsZonedDateTime(Handle<Value> v) {
 return v.isObject() && v.toObject().is<ZonedDateTimeObject>();
}

// Returns |RoundNumberToIncrement(offsetNanoseconds, 60 × 10^9, "halfExpand")|.
static int64_t RoundNanosecondsToMinutesIncrement(int64_t offsetNanoseconds) {
 MOZ_ASSERT(std::abs(offsetNanoseconds) < ToNanoseconds(TemporalUnit::Day));

 constexpr int64_t increment = ToNanoseconds(TemporalUnit::Minute);

 int64_t quotient = offsetNanoseconds / increment;
 int64_t remainder = offsetNanoseconds % increment;
 if (std::abs(remainder * 2) >= increment) {
   quotient += (offsetNanoseconds > 0 ? 1 : -1);
 }
 return quotient * increment;
}

/**
* InterpretISODateTimeOffset ( isoDate, time, offsetBehaviour,
* offsetNanoseconds, timeZone, disambiguation, offsetOption, matchBehaviour )
*/
bool js::temporal::InterpretISODateTimeOffset(
   JSContext* cx, const ISODateTime& dateTime, OffsetBehaviour offsetBehaviour,
   int64_t offsetNanoseconds, Handle<TimeZoneValue> timeZone,
   TemporalDisambiguation disambiguation, TemporalOffset offsetOption,
   MatchBehaviour matchBehaviour, EpochNanoseconds* result) {
 MOZ_ASSERT(std::abs(offsetNanoseconds) < ToNanoseconds(TemporalUnit::Day));
 MOZ_ASSERT(IsValidISODateTime(dateTime));

 // FIXME: spec issue - avoid calling with date-time outside of limits
 // https://github.com/tc39/proposal-temporal/pull/3014
 if (!ISODateTimeWithinLimits(dateTime)) {
   JS_ReportErrorNumberASCII(cx, GetErrorMessage, nullptr,
                             JSMSG_TEMPORAL_PLAIN_DATE_TIME_INVALID);
   return false;
 }

 // Steps 1-2. (Not applicable in our implementation.)

 // Step 3.
 if (offsetBehaviour == OffsetBehaviour::Wall ||
     (offsetBehaviour == OffsetBehaviour::Option &&
      offsetOption == TemporalOffset::Ignore)) {
   // Steps 3.a-b.
   return GetEpochNanosecondsFor(cx, timeZone, dateTime, disambiguation,
                                 result);
 }

 // Step 4.
 if (offsetBehaviour == OffsetBehaviour::Exact ||
     (offsetBehaviour == OffsetBehaviour::Option &&
      offsetOption == TemporalOffset::Use)) {
   // Step 4.a.
   auto epochNanoseconds = GetUTCEpochNanoseconds(dateTime) -
                           EpochDuration::fromNanoseconds(offsetNanoseconds);

   // Step 4.b.
   if (!IsValidEpochNanoseconds(epochNanoseconds)) {
     JS_ReportErrorNumberASCII(cx, GetErrorMessage, nullptr,
                               JSMSG_TEMPORAL_INSTANT_INVALID);
     return false;
   }

   // Step 4.c.
   *result = epochNanoseconds;
   return true;
 }

 // Step 5.
 MOZ_ASSERT(offsetBehaviour == OffsetBehaviour::Option);

 // Step 6.
 MOZ_ASSERT(offsetOption == TemporalOffset::Prefer ||
            offsetOption == TemporalOffset::Reject);

 // Step 7.
 PossibleEpochNanoseconds possibleEpochNs;
 if (!GetPossibleEpochNanoseconds(cx, timeZone, dateTime, &possibleEpochNs)) {
   return false;
 }

 // Step 8.a.
 for (const auto& candidate : possibleEpochNs) {
   // Step 8.a.i.
   int64_t candidateNanoseconds;
   if (!GetOffsetNanosecondsFor(cx, timeZone, candidate,
                                &candidateNanoseconds)) {
     return false;
   }
   MOZ_ASSERT(std::abs(candidateNanoseconds) <
              ToNanoseconds(TemporalUnit::Day));

   // Step 8.a.ii.
   if (candidateNanoseconds == offsetNanoseconds) {
     *result = candidate;
     return true;
   }

   // Step 8.a.iii.
   if (matchBehaviour == MatchBehaviour::MatchMinutes) {
     // Step 8.a.iii.1.
     int64_t roundedCandidateNanoseconds =
         RoundNanosecondsToMinutesIncrement(candidateNanoseconds);

     // Step 8.a.iii.2.
     if (roundedCandidateNanoseconds == offsetNanoseconds) {
       // Step 8.a.iii.2.a.
       *result = candidate;
       return true;
     }
   }
 }

 // Step 9.
 if (offsetOption == TemporalOffset::Reject) {
   JS_ReportErrorNumberASCII(cx, GetErrorMessage, nullptr,
                             JSMSG_TEMPORAL_ZONED_DATE_TIME_NO_TIME_FOUND);
   return false;
 }

 // Step 10.
 return DisambiguatePossibleEpochNanoseconds(cx, possibleEpochNs, timeZone,
                                             dateTime, disambiguation, result);
}

/**
* InterpretISODateTimeOffset ( isoDate, time, offsetBehaviour,
* offsetNanoseconds, timeZone, disambiguation, offsetOption, matchBehaviour )
*/
bool js::temporal::InterpretISODateTimeOffset(
   JSContext* cx, const ISODate& isoDate, OffsetBehaviour offsetBehaviour,
   int64_t offsetNanoseconds, Handle<TimeZoneValue> timeZone,
   TemporalDisambiguation disambiguation, TemporalOffset offsetOption,
   MatchBehaviour matchBehaviour, EpochNanoseconds* result) {
 MOZ_ASSERT(std::abs(offsetNanoseconds) < ToNanoseconds(TemporalUnit::Day));
 MOZ_ASSERT(IsValidISODate(isoDate));

 // Step 1. (Not applicable in our implementation.)

 // Step 2.a.
 MOZ_ASSERT(offsetBehaviour == OffsetBehaviour::Wall);

 // Step 2.b.
 MOZ_ASSERT(offsetNanoseconds == 0);

 // Step 2.c.
 return GetStartOfDay(cx, timeZone, isoDate, result);
}

struct ZonedDateTimeOptions {
 TemporalDisambiguation disambiguation = TemporalDisambiguation::Compatible;
 TemporalOffset offset = TemporalOffset::Reject;
 TemporalOverflow overflow = TemporalOverflow::Constrain;
};

/**
* ToTemporalZonedDateTime ( item [ , options ] )
*/
static bool ToTemporalZonedDateTimeOptions(JSContext* cx, Handle<Value> options,
                                          ZonedDateTimeOptions* result) {
 if (options.isUndefined()) {
   *result = {};
   return true;
 }

 // NOTE: |options| are only passed from `Temporal.ZonedDateTime.from`.

 Rooted<JSObject*> resolvedOptions(
     cx, RequireObjectArg(cx, "options", "from", options));
 if (!resolvedOptions) {
   return false;
 }

 auto disambiguation = TemporalDisambiguation::Compatible;
 if (!GetTemporalDisambiguationOption(cx, resolvedOptions, &disambiguation)) {
   return false;
 }

 auto offset = TemporalOffset::Reject;
 if (!GetTemporalOffsetOption(cx, resolvedOptions, &offset)) {
   return false;
 }

 auto overflow = TemporalOverflow::Constrain;
 if (!GetTemporalOverflowOption(cx, resolvedOptions, &overflow)) {
   return false;
 }

 *result = {disambiguation, offset, overflow};
 return true;
}

/**
* ToTemporalZonedDateTime ( item [ , options ] )
*/
static bool ToTemporalZonedDateTime(JSContext* cx, Handle<JSObject*> item,
                                   Handle<Value> options,
                                   MutableHandle<ZonedDateTime> result) {
 // Step 1. (Not applicable in our implementation.)

 // Step 2. (Not applicable)

 // Step 3.
 auto matchBehaviour = MatchBehaviour::MatchExactly;

 // Step 4.a.
 if (auto* zonedDateTime = item->maybeUnwrapIf<ZonedDateTimeObject>()) {
   auto epochNs = zonedDateTime->epochNanoseconds();
   Rooted<TimeZoneValue> timeZone(cx, zonedDateTime->timeZone());
   Rooted<CalendarValue> calendar(cx, zonedDateTime->calendar());

   if (!timeZone.wrap(cx)) {
     return false;
   }
   if (!calendar.wrap(cx)) {
     return false;
   }

   // Steps 4.a.i-v.
   ZonedDateTimeOptions ignoredOptions;
   if (!ToTemporalZonedDateTimeOptions(cx, options, &ignoredOptions)) {
     return false;
   }

   // Step 4.a.vi.
   result.set(ZonedDateTime{epochNs, timeZone, calendar});
   return true;
 }

 // Step 4.b.
 Rooted<CalendarValue> calendar(cx);
 if (!GetTemporalCalendarWithISODefault(cx, item, &calendar)) {
   return false;
 }

 // Step 4.c.
 Rooted<CalendarFields> fields(cx);
 if (!PrepareCalendarFields(cx, calendar, item,
                            {
                                CalendarField::Year,
                                CalendarField::Month,
                                CalendarField::MonthCode,
                                CalendarField::Day,
                                CalendarField::Hour,
                                CalendarField::Minute,
                                CalendarField::Second,
                                CalendarField::Millisecond,
                                CalendarField::Microsecond,
                                CalendarField::Nanosecond,
                                CalendarField::Offset,
                                CalendarField::TimeZone,
                            },
                            {CalendarField::TimeZone}, &fields)) {
   return false;
 }

 // Step 4.d.
 auto timeZone = fields.timeZone();

 // Step 4.e.
 auto offsetString = fields.offset();

 // Steps 4.f-i.
 ZonedDateTimeOptions resolvedOptions;
 if (!ToTemporalZonedDateTimeOptions(cx, options, &resolvedOptions)) {
   return false;
 }
 auto [disambiguation, offsetOption, overflow] = resolvedOptions;

 // Steps 4.j-l.
 ISODateTime dateTime;
 if (!InterpretTemporalDateTimeFields(cx, calendar, fields, overflow,
                                      &dateTime)) {
   return false;
 }

 // Steps 5-6. (Not applicable)

 // Steps 7-8.
 auto offsetBehaviour = !fields.has(CalendarField::Offset)
                            ? OffsetBehaviour::Wall
                            : OffsetBehaviour::Option;

 // Step 9.
 int64_t offsetNanoseconds = 0;

 // Step 10.
 if (offsetBehaviour == OffsetBehaviour::Option) {
   offsetNanoseconds = int64_t(offsetString);
 }

 // Step 11.
 EpochNanoseconds epochNanoseconds;
 if (!InterpretISODateTimeOffset(
         cx, dateTime, offsetBehaviour, offsetNanoseconds, timeZone,
         disambiguation, offsetOption, matchBehaviour, &epochNanoseconds)) {
   return false;
 }
 MOZ_ASSERT(IsValidEpochNanoseconds(epochNanoseconds));

 // Step 12.
 result.set(ZonedDateTime{epochNanoseconds, timeZone, calendar});
 return true;
}

/**
* ToTemporalZonedDateTime ( item [ , options ] )
*/
static bool ToTemporalZonedDateTime(JSContext* cx, Handle<Value> item,
                                   Handle<Value> options,
                                   MutableHandle<ZonedDateTime> result) {
 // Step 1. (Not applicable in our implementation.)

 // Steps 2-3. (Not applicable)

 // Step 4.
 if (item.isObject()) {
   Rooted<JSObject*> itemObj(cx, &item.toObject());
   return ToTemporalZonedDateTime(cx, itemObj, options, result);
 }

 // Step 5.a.
 if (!item.isString()) {
   ReportValueError(cx, JSMSG_UNEXPECTED_TYPE, JSDVG_IGNORE_STACK, item,
                    nullptr, "not a string");
   return false;
 }
 Rooted<JSString*> string(cx, item.toString());

 // Case 1: 19700101Z[+02:00]
 // { [[Z]]: true, [[OffsetString]]: undefined, [[Name]]: "+02:00" }
 //
 // Case 2: 19700101+00:00[+02:00]
 // { [[Z]]: false, [[OffsetString]]: "+00:00", [[Name]]: "+02:00" }
 //
 // Case 3: 19700101[+02:00]
 // { [[Z]]: false, [[OffsetString]]: undefined, [[Name]]: "+02:00" }
 //
 // Case 4: 19700101Z[Europe/Berlin]
 // { [[Z]]: true, [[OffsetString]]: undefined, [[Name]]: "Europe/Berlin" }
 //
 // Case 5: 19700101+00:00[Europe/Berlin]
 // { [[Z]]: false, [[OffsetString]]: "+00:00", [[Name]]: "Europe/Berlin" }
 //
 // Case 6: 19700101[Europe/Berlin]
 // { [[Z]]: false, [[OffsetString]]: undefined, [[Name]]: "Europe/Berlin" }

 // Steps 5.b-c.
 Rooted<ParsedZonedDateTime> parsed(cx);
 if (!ParseTemporalZonedDateTimeString(cx, string, &parsed)) {
   return false;
 }

 // Step 5.d.
 MOZ_ASSERT(parsed.timeZoneAnnotation());

 // Step 5.e.
 Rooted<TimeZoneValue> timeZone(cx);
 if (!ToTemporalTimeZone(cx, parsed.timeZoneAnnotation(), &timeZone)) {
   return false;
 }

 // Step 5.f. (Not applicable in our implementation.)

 // Step 5.g.
 bool hasUTCDesignator = parsed.timeZone().constructed<UTCTimeZone>();

 // Steps 5.h-i.
 Rooted<CalendarValue> calendar(cx, CalendarValue(CalendarId::ISO8601));
 if (parsed.calendar()) {
   if (!CanonicalizeCalendar(cx, parsed.calendar(), &calendar)) {
     return false;
   }
 }

 // Step 5.k.
 auto matchBehaviour = MatchBehaviour::MatchMinutes;

 // Step 5.l.
 if (parsed.timeZone().constructed<OffsetTimeZone>()) {
   // Steps 5.l.i-iii.
   if (parsed.timeZone().ref<OffsetTimeZone>().hasSubMinutePrecision) {
     matchBehaviour = MatchBehaviour::MatchExactly;
   }
 }

 // Steps 5.m-p.
 ZonedDateTimeOptions resolvedOptions;
 if (!ToTemporalZonedDateTimeOptions(cx, options, &resolvedOptions)) {
   return false;
 }
 auto [disambiguation, offsetOption, overflow] = resolvedOptions;

 // Steps 5.q-r.
 const auto& isoDateTime = parsed.dateTime();

 // Steps 6-8.
 auto offsetBehaviour = hasUTCDesignator            ? OffsetBehaviour::Exact
                        : parsed.timeZone().empty() ? OffsetBehaviour::Wall
                                                    : OffsetBehaviour::Option;

 // Step 9.
 int64_t offsetNanoseconds = 0;

 // Step 10.
 if (offsetBehaviour == OffsetBehaviour::Option) {
   MOZ_ASSERT(parsed.timeZone().constructed<OffsetTimeZone>());
   offsetNanoseconds = parsed.timeZone().ref<OffsetTimeZone>().offset;
 }

 // Step 11.
 EpochNanoseconds epochNanoseconds;
 if (parsed.isStartOfDay()) {
   if (!InterpretISODateTimeOffset(
           cx, isoDateTime.date, offsetBehaviour, offsetNanoseconds, timeZone,
           disambiguation, offsetOption, matchBehaviour, &epochNanoseconds)) {
     return false;
   }
 } else {
   if (!InterpretISODateTimeOffset(
           cx, isoDateTime, offsetBehaviour, offsetNanoseconds, timeZone,
           disambiguation, offsetOption, matchBehaviour, &epochNanoseconds)) {
     return false;
   }
 }
 MOZ_ASSERT(IsValidEpochNanoseconds(epochNanoseconds));

 // Step 12.
 result.set(ZonedDateTime{epochNanoseconds, timeZone, calendar});
 return true;
}

/**
* ToTemporalZonedDateTime ( item [ , options ] )
*/
static bool ToTemporalZonedDateTime(JSContext* cx, Handle<Value> item,
                                   MutableHandle<ZonedDateTime> result) {
 return ToTemporalZonedDateTime(cx, item, UndefinedHandleValue, result);
}

/**
* CreateTemporalZonedDateTime ( epochNanoseconds, timeZone, calendar [ ,
* newTarget ] )
*/
static ZonedDateTimeObject* CreateTemporalZonedDateTime(
   JSContext* cx, const CallArgs& args, Handle<BigInt*> epochNanoseconds,
   Handle<TimeZoneValue> timeZone, Handle<CalendarValue> calendar) {
 // Step 1.
 MOZ_ASSERT(IsValidEpochNanoseconds(epochNanoseconds));

 // Steps 3-4.
 Rooted<JSObject*> proto(cx);
 if (!GetPrototypeFromBuiltinConstructor(cx, args, JSProto_ZonedDateTime,
                                         &proto)) {
   return nullptr;
 }

 auto* object = NewObjectWithClassProto<ZonedDateTimeObject>(cx, proto);
 if (!object) {
   return nullptr;
 }

 // Step 4.
 auto epochNs = ToEpochNanoseconds(epochNanoseconds);
 object->initFixedSlot(ZonedDateTimeObject::SECONDS_SLOT,
                       NumberValue(epochNs.seconds));
 object->initFixedSlot(ZonedDateTimeObject::NANOSECONDS_SLOT,
                       Int32Value(epochNs.nanoseconds));

 // Step 5.
 object->initFixedSlot(ZonedDateTimeObject::TIMEZONE_SLOT,
                       timeZone.toSlotValue());

 // Step 6.
 object->initFixedSlot(ZonedDateTimeObject::CALENDAR_SLOT,
                       calendar.toSlotValue());

 // Step 7.
 return object;
}

/**
* CreateTemporalZonedDateTime ( epochNanoseconds, timeZone, calendar [ ,
* newTarget ] )
*/
ZonedDateTimeObject* js::temporal::CreateTemporalZonedDateTime(
   JSContext* cx, const EpochNanoseconds& epochNanoseconds,
   Handle<TimeZoneValue> timeZone, Handle<CalendarValue> calendar) {
 // Step 1.
 MOZ_ASSERT(IsValidEpochNanoseconds(epochNanoseconds));

 // Steps 2-3.
 auto* object = NewBuiltinClassInstance<ZonedDateTimeObject>(cx);
 if (!object) {
   return nullptr;
 }

 // Step 4.
 object->initFixedSlot(ZonedDateTimeObject::SECONDS_SLOT,
                       NumberValue(epochNanoseconds.seconds));
 object->initFixedSlot(ZonedDateTimeObject::NANOSECONDS_SLOT,
                       Int32Value(epochNanoseconds.nanoseconds));

 // Step 5.
 object->initFixedSlot(ZonedDateTimeObject::TIMEZONE_SLOT,
                       timeZone.toSlotValue());

 // Step 6.
 object->initFixedSlot(ZonedDateTimeObject::CALENDAR_SLOT,
                       calendar.toSlotValue());

 // Step 7.
 return object;
}

/**
* CreateTemporalZonedDateTime ( epochNanoseconds, timeZone, calendar [ ,
* newTarget ] )
*/
static auto* CreateTemporalZonedDateTime(JSContext* cx,
                                        Handle<ZonedDateTime> zonedDateTime) {
 return CreateTemporalZonedDateTime(cx, zonedDateTime.epochNanoseconds(),
                                    zonedDateTime.timeZone(),
                                    zonedDateTime.calendar());
}

/**
* AddZonedDateTime ( epochNanoseconds, timeZone, calendar, duration, overflow )
*/
static bool AddZonedDateTime(JSContext* cx, Handle<ZonedDateTime> zonedDateTime,
                            const InternalDuration& duration,
                            TemporalOverflow overflow,
                            EpochNanoseconds* result) {
 MOZ_ASSERT(IsValidDuration(duration));

 // Step 1.
 if (duration.date == DateDuration{}) {
   // Step 1.a.
   return AddInstant(cx, zonedDateTime.epochNanoseconds(), duration.time,
                     result);
 }

 // Step 2.
 ISODateTime isoDateTime;
 if (!GetISODateTimeFor(cx, zonedDateTime.timeZone(),
                        zonedDateTime.epochNanoseconds(), &isoDateTime)) {
   return false;
 }

 // Step 3.
 ISODate addedDate;
 if (!CalendarDateAdd(cx, zonedDateTime.calendar(), isoDateTime.date,
                      duration.date, overflow, &addedDate)) {
   return false;
 }

 // Step 4.
 auto intermediateDateTime = ISODateTime{addedDate, isoDateTime.time};

 // Step 5.
 if (!ISODateTimeWithinLimits(intermediateDateTime)) {
   JS_ReportErrorNumberASCII(cx, GetErrorMessage, nullptr,
                             JSMSG_TEMPORAL_PLAIN_DATE_TIME_INVALID);
   return false;
 }

 // Step 6.
 EpochNanoseconds intermediateNs;
 if (!GetEpochNanosecondsFor(
         cx, zonedDateTime.timeZone(), intermediateDateTime,
         TemporalDisambiguation::Compatible, &intermediateNs)) {
   return false;
 }

 // Step 7.
 return AddInstant(cx, intermediateNs, duration.time, result);
}

/**
* AddZonedDateTime ( epochNanoseconds, timeZone, calendar, duration, overflow )
*/
bool js::temporal::AddZonedDateTime(JSContext* cx,
                                   Handle<ZonedDateTime> zonedDateTime,
                                   const InternalDuration& duration,
                                   EpochNanoseconds* result) {
 return ::AddZonedDateTime(cx, zonedDateTime, duration,
                           TemporalOverflow::Constrain, result);
}

/**
* DifferenceZonedDateTime ( ns1, ns2, timeZone, calendar, largestUnit )
*/
static bool DifferenceZonedDateTime(JSContext* cx, const EpochNanoseconds& ns1,
                                   const EpochNanoseconds& ns2,
                                   Handle<TimeZoneValue> timeZone,
                                   Handle<CalendarValue> calendar,
                                   TemporalUnit largestUnit,
                                   InternalDuration* result) {
 MOZ_ASSERT(IsValidEpochNanoseconds(ns1));
 MOZ_ASSERT(IsValidEpochNanoseconds(ns2));

 // Steps 1.
 if (ns1 == ns2) {
   *result = InternalDuration{{}, {}};
   return true;
 }

 // Step 2.
 ISODateTime startDateTime;
 if (!GetISODateTimeFor(cx, timeZone, ns1, &startDateTime)) {
   return false;
 }

 // Steps 2-3.
 ISODateTime endDateTime;
 if (!GetISODateTimeFor(cx, timeZone, ns2, &endDateTime)) {
   return false;
 }

 // Step 4.
 if (CompareISODate(startDateTime.date, endDateTime.date) == 0) {
   // Step 4.a.
   auto timeDuration = TimeDurationFromEpochNanosecondsDifference(ns2, ns1);

   // Step 4.b.
   *result = {{}, timeDuration};
   return true;
 }

 // Step 5.
 int32_t sign = (ns2 - ns1 < EpochDuration{}) ? -1 : 1;

 // Step 6.
 int32_t maxDayCorrection = 1 + (sign > 0);

 // Step 7.
 int32_t dayCorrection = 0;

 // Step 8.
 auto timeDuration = DifferenceTime(startDateTime.time, endDateTime.time);

 // Step 9.
 if (TimeDurationSign(timeDuration) == -sign) {
   dayCorrection += 1;
 }

 // Steps 10-11.
 while (dayCorrection <= maxDayCorrection) {
   // Step 11.a.
   auto intermediateDate =
       BalanceISODate(endDateTime.date, -dayCorrection * sign);

   // Step 11.b.
   auto intermediateDateTime =
       ISODateTime{intermediateDate, startDateTime.time};
   if (!ISODateTimeWithinLimits(intermediateDateTime)) {
     JS_ReportErrorNumberASCII(cx, GetErrorMessage, nullptr,
                               JSMSG_TEMPORAL_PLAIN_DATE_TIME_INVALID);
     return false;
   }

   // Step 11.c.
   EpochNanoseconds intermediateNs;
   if (!GetEpochNanosecondsFor(cx, timeZone, intermediateDateTime,
                               TemporalDisambiguation::Compatible,
                               &intermediateNs)) {
     return false;
   }

   // Step 11.d.
   auto timeDuration =
       TimeDurationFromEpochNanosecondsDifference(ns2, intermediateNs);

   // Step 11.e.
   int32_t timeSign = TimeDurationSign(timeDuration);

   // Step 11.f.
   if (sign != -timeSign) {
     // Step 13.
     auto dateLargestUnit = std::min(largestUnit, TemporalUnit::Day);

     // Step 14.
     DateDuration dateDifference;
     if (!CalendarDateUntil(cx, calendar, startDateTime.date, intermediateDate,
                            dateLargestUnit, &dateDifference)) {
       return false;
     }

     // Step 15.
     MOZ_ASSERT(DateDurationSign(dateDifference) *
                    TimeDurationSign(timeDuration) >=
                0);
     *result = {dateDifference, timeDuration};
     return true;
   }

   // Step 11.g.
   dayCorrection += 1;
 }

 // Step 12.
 JS_ReportErrorNumberASCII(
     cx, GetErrorMessage, nullptr,
     JSMSG_TEMPORAL_ZONED_DATE_TIME_INCONSISTENT_INSTANT);
 return false;
}

/**
* DifferenceZonedDateTimeWithRounding ( ns1, ns2, timeZone, calendar,
* largestUnit, roundingIncrement, smallestUnit, roundingMode )
*/
bool js::temporal::DifferenceZonedDateTimeWithRounding(
   JSContext* cx, JS::Handle<ZonedDateTime> zonedDateTime,
   const EpochNanoseconds& ns2, const DifferenceSettings& settings,
   InternalDuration* result) {
 MOZ_ASSERT(IsValidEpochNanoseconds(ns2));
 MOZ_ASSERT(settings.smallestUnit >= settings.largestUnit);

 const auto& ns1 = zonedDateTime.epochNanoseconds();
 auto timeZone = zonedDateTime.timeZone();
 auto calendar = zonedDateTime.calendar();

 // Step 1.
 if (settings.largestUnit > TemporalUnit::Day) {
   // Step 1.a.
   auto difference =
       DifferenceInstant(ns1, ns2, settings.roundingIncrement,
                         settings.smallestUnit, settings.roundingMode);
   *result = InternalDuration{{}, difference};
   return true;
 }

 // Step 2.
 InternalDuration difference;
 if (!DifferenceZonedDateTime(cx, ns1, ns2, timeZone, calendar,
                              settings.largestUnit, &difference)) {
   return false;
 }

 // Step 3.
 if (settings.smallestUnit == TemporalUnit::Nanosecond &&
     settings.roundingIncrement == Increment{1}) {
   // Step 3.a.
   *result = difference;
   return true;
 }

 // Step 4.
 ISODateTime dateTime;
 if (!GetISODateTimeFor(cx, timeZone, ns1, &dateTime)) {
   return false;
 }

 // Step 5.
 return RoundRelativeDuration(
     cx, difference, ns1, ns2, dateTime, timeZone, calendar,
     settings.largestUnit, settings.roundingIncrement, settings.smallestUnit,
     settings.roundingMode, result);
}

/**
* DifferenceZonedDateTimeWithTotal ( ns1, ns2, timeZone, calendar, unit )
*/
bool js::temporal::DifferenceZonedDateTimeWithTotal(
   JSContext* cx, JS::Handle<ZonedDateTime> zonedDateTime,
   const EpochNanoseconds& ns2, TemporalUnit unit, double* result) {
 MOZ_ASSERT(IsValidEpochNanoseconds(ns2));

 const auto& ns1 = zonedDateTime.epochNanoseconds();
 auto timeZone = zonedDateTime.timeZone();
 auto calendar = zonedDateTime.calendar();

 // Step 1.
 if (unit > TemporalUnit::Day) {
   // Step 1.a.
   auto difference = TimeDurationFromEpochNanosecondsDifference(ns2, ns1);
   MOZ_ASSERT(IsValidEpochDuration(difference.to<EpochDuration>()));

   // Step 1.b.
   *result = TotalTimeDuration(difference, unit);
   return true;
 }

 // Step 2.
 InternalDuration difference;
 if (!DifferenceZonedDateTime(cx, ns1, ns2, timeZone, calendar, unit,
                              &difference)) {
   return false;
 }

 // Step 3.
 ISODateTime dateTime;
 if (!GetISODateTimeFor(cx, timeZone, ns1, &dateTime)) {
   return false;
 }

 // Step 5.
 return TotalRelativeDuration(cx, difference, ns1, ns2, dateTime, timeZone,
                              calendar, unit, result);
}

/**
* DifferenceTemporalZonedDateTime ( operation, zonedDateTime, other, options )
*/
static bool DifferenceTemporalZonedDateTime(JSContext* cx,
                                           TemporalDifference operation,
                                           const CallArgs& args) {
 Rooted<ZonedDateTime> zonedDateTime(
     cx, ZonedDateTime{&args.thisv().toObject().as<ZonedDateTimeObject>()});

 // Step 1.
 Rooted<ZonedDateTime> other(cx);
 if (!ToTemporalZonedDateTime(cx, args.get(0), &other)) {
   return false;
 }

 // Step 2.
 if (!CalendarEquals(zonedDateTime.calendar(), other.calendar())) {
   JS_ReportErrorNumberASCII(
       cx, GetErrorMessage, nullptr, JSMSG_TEMPORAL_CALENDAR_INCOMPATIBLE,
       CalendarIdentifier(zonedDateTime.calendar()).data(),
       CalendarIdentifier(other.calendar()).data());
   return false;
 }

 // Steps 3-4.
 DifferenceSettings settings;
 if (args.hasDefined(1)) {
   // Step 3.
   Rooted<JSObject*> options(
       cx, RequireObjectArg(cx, "options", ToName(operation), args[1]));
   if (!options) {
     return false;
   }

   // Step 4.
   if (!GetDifferenceSettings(
           cx, operation, options, TemporalUnitGroup::DateTime,
           TemporalUnit::Nanosecond, TemporalUnit::Hour, &settings)) {
     return false;
   }
 } else {
   // Steps 3-4.
   settings = {
       TemporalUnit::Nanosecond,
       TemporalUnit::Hour,
       TemporalRoundingMode::Trunc,
       Increment{1},
   };
 }

 // Step 5.
 if (settings.largestUnit > TemporalUnit::Day) {
   MOZ_ASSERT(settings.smallestUnit >= settings.largestUnit);

   // Step 5.a.
   auto timeDuration =
       DifferenceInstant(zonedDateTime.epochNanoseconds(),
                         other.epochNanoseconds(), settings.roundingIncrement,
                         settings.smallestUnit, settings.roundingMode);

   // Step 5.b.
   Duration result;
   if (!TemporalDurationFromInternal(cx, timeDuration, settings.largestUnit,
                                     &result)) {
     return false;
   }

   // Step 5.c.
   if (operation == TemporalDifference::Since) {
     result = result.negate();
   }

   // Step 5.d.
   auto* obj = CreateTemporalDuration(cx, result);
   if (!obj) {
     return false;
   }

   args.rval().setObject(*obj);
   return true;
 }

 // Steps 6-7.
 if (!TimeZoneEquals(zonedDateTime.timeZone(), other.timeZone())) {
   if (auto one = QuoteString(cx, zonedDateTime.timeZone().identifier())) {
     if (auto two = QuoteString(cx, other.timeZone().identifier())) {
       JS_ReportErrorNumberUTF8(cx, GetErrorMessage, nullptr,
                                JSMSG_TEMPORAL_TIMEZONE_INCOMPATIBLE,
                                one.get(), two.get());
     }
   }
   return false;
 }

 // Step 8.
 if (zonedDateTime.epochNanoseconds() == other.epochNanoseconds()) {
   auto* obj = CreateTemporalDuration(cx, {});
   if (!obj) {
     return false;
   }

   args.rval().setObject(*obj);
   return true;
 }

 // Step 9.
 InternalDuration internalDuration;
 if (!DifferenceZonedDateTimeWithRounding(cx, zonedDateTime,
                                          other.epochNanoseconds(), settings,
                                          &internalDuration)) {
   return false;
 }
 MOZ_ASSERT(IsValidDuration(internalDuration));

 // Step 10.
 Duration result;
 if (!TemporalDurationFromInternal(cx, internalDuration, TemporalUnit::Hour,
                                   &result)) {
   return false;
 }

 // Step 11.
 if (operation == TemporalDifference::Since) {
   result = result.negate();
 }

 // Step 12.
 auto* obj = CreateTemporalDuration(cx, result);
 if (!obj) {
   return false;
 }

 args.rval().setObject(*obj);
 return true;
}

/**
* AddDurationToZonedDateTime ( operation, zonedDateTime, temporalDurationLike,
* options )
*/
static bool AddDurationToZonedDateTime(JSContext* cx,
                                      TemporalAddDuration operation,
                                      const CallArgs& args) {
 Rooted<ZonedDateTime> zonedDateTime(
     cx, &args.thisv().toObject().as<ZonedDateTimeObject>());

 // Step 1.
 Duration duration;
 if (!ToTemporalDuration(cx, args.get(0), &duration)) {
   return false;
 }

 // Step 2.
 if (operation == TemporalAddDuration::Subtract) {
   duration = duration.negate();
 }

 // Steps 3-4.
 auto overflow = TemporalOverflow::Constrain;
 if (args.hasDefined(1)) {
   // Step 3.
   Rooted<JSObject*> options(
       cx, RequireObjectArg(cx, "options", ToName(operation), args[1]));
   if (!options) {
     return false;
   }

   // Step 4.
   if (!GetTemporalOverflowOption(cx, options, &overflow)) {
     return false;
   }
 }

 // Step 5.
 auto calendar = zonedDateTime.calendar();

 // Step 6.
 auto timeZone = zonedDateTime.timeZone();

 // Step 7.
 auto internalDuration = ToInternalDurationRecord(duration);

 // Step 8.
 EpochNanoseconds epochNanoseconds;
 if (!::AddZonedDateTime(cx, zonedDateTime, internalDuration, overflow,
                         &epochNanoseconds)) {
   return false;
 }
 MOZ_ASSERT(IsValidEpochNanoseconds(epochNanoseconds));

 // Step 9.
 auto* result =
     CreateTemporalZonedDateTime(cx, epochNanoseconds, timeZone, calendar);
 if (!result) {
   return false;
 }

 args.rval().setObject(*result);
 return true;
}

/**
* FormatUTCOffsetNanoseconds ( offsetNanoseconds )
*/
static JSString* FormatUTCOffsetNanoseconds(JSContext* cx,
                                           int64_t offsetNanoseconds) {
 MOZ_ASSERT(std::abs(offsetNanoseconds) < ToNanoseconds(TemporalUnit::Day));

 // Step 1.
 char sign = offsetNanoseconds >= 0 ? '+' : '-';

 // Step 2.
 int64_t absoluteNanoseconds = std::abs(offsetNanoseconds);

 // Step 6. (Reordered)
 int32_t subSecondNanoseconds = int32_t(absoluteNanoseconds % 1'000'000'000);

 // Step 5. (Reordered)
 int32_t quotient = int32_t(absoluteNanoseconds / 1'000'000'000);
 int32_t second = quotient % 60;

 // Step 4. (Reordered)
 quotient /= 60;
 int32_t minute = quotient % 60;

 // Step 3.
 int32_t hour = quotient / 60;
 MOZ_ASSERT(hour < 24, "time zone offset mustn't exceed 24-hours");

 // Format: "sign hour{2} : minute{2} : second{2} . fractional{9}"
 constexpr size_t maxLength = 1 + 2 + 1 + 2 + 1 + 2 + 1 + 9;
 char result[maxLength];

 size_t n = 0;

 // Steps 7-8. (Inlined FormatTimeString).
 result[n++] = sign;
 result[n++] = char('0' + (hour / 10));
 result[n++] = char('0' + (hour % 10));
 result[n++] = ':';
 result[n++] = char('0' + (minute / 10));
 result[n++] = char('0' + (minute % 10));

 if (second != 0 || subSecondNanoseconds != 0) {
   result[n++] = ':';
   result[n++] = char('0' + (second / 10));
   result[n++] = char('0' + (second % 10));

   if (uint32_t fractional = subSecondNanoseconds) {
     result[n++] = '.';

     uint32_t k = 100'000'000;
     do {
       result[n++] = char('0' + (fractional / k));
       fractional %= k;
       k /= 10;
     } while (fractional);
   }
 }

 MOZ_ASSERT(n <= maxLength);

 // Step 9.
 return NewStringCopyN<CanGC>(cx, result, n);
}

/**
* Temporal.ZonedDateTime ( epochNanoseconds, timeZone [ , calendar ] )
*/
static bool ZonedDateTimeConstructor(JSContext* cx, unsigned argc, Value* vp) {
 CallArgs args = CallArgsFromVp(argc, vp);

 // Step 1.
 if (!ThrowIfNotConstructing(cx, args, "Temporal.ZonedDateTime")) {
   return false;
 }

 // Step 2.
 Rooted<BigInt*> epochNanoseconds(cx, js::ToBigInt(cx, args.get(0)));
 if (!epochNanoseconds) {
   return false;
 }

 // Step 3.
 if (!IsValidEpochNanoseconds(epochNanoseconds)) {
   JS_ReportErrorNumberASCII(cx, GetErrorMessage, nullptr,
                             JSMSG_TEMPORAL_INSTANT_INVALID);
   return false;
 }

 // Step 4.
 if (!args.get(1).isString()) {
   ReportValueError(cx, JSMSG_UNEXPECTED_TYPE, JSDVG_IGNORE_STACK, args.get(1),
                    nullptr, "not a string");
   return false;
 }

 // Step 5.
 Rooted<JSString*> timeZoneString(cx, args[1].toString());
 Rooted<ParsedTimeZone> timeZoneParse(cx);
 if (!ParseTimeZoneIdentifier(cx, timeZoneString, &timeZoneParse)) {
   return false;
 }

 // Steps 6-7.
 Rooted<TimeZoneValue> timeZone(cx);
 if (!ToTemporalTimeZone(cx, timeZoneParse, &timeZone)) {
   return false;
 }

 // Steps 8-10.
 Rooted<CalendarValue> calendar(cx, CalendarValue(CalendarId::ISO8601));
 if (args.hasDefined(2)) {
   // Step 9.
   if (!args[2].isString()) {
     ReportValueError(cx, JSMSG_UNEXPECTED_TYPE, JSDVG_IGNORE_STACK, args[2],
                      nullptr, "not a string");
     return false;
   }

   // Step 10.
   Rooted<JSString*> calendarString(cx, args[2].toString());
   if (!CanonicalizeCalendar(cx, calendarString, &calendar)) {
     return false;
   }
 }

 // Step 11.
 auto* obj = CreateTemporalZonedDateTime(cx, args, epochNanoseconds, timeZone,
                                         calendar);
 if (!obj) {
   return false;
 }

 args.rval().setObject(*obj);
 return true;
}

/**
* Temporal.ZonedDateTime.from ( item [ , options ] )
*/
static bool ZonedDateTime_from(JSContext* cx, unsigned argc, Value* vp) {
 CallArgs args = CallArgsFromVp(argc, vp);

 // Step 1.
 Rooted<ZonedDateTime> zonedDateTime(cx);
 if (!ToTemporalZonedDateTime(cx, args.get(0), args.get(1), &zonedDateTime)) {
   return false;
 }

 auto* result = CreateTemporalZonedDateTime(cx, zonedDateTime);
 if (!result) {
   return false;
 }

 args.rval().setObject(*result);
 return true;
}

/**
* Temporal.ZonedDateTime.compare ( one, two )
*/
static bool ZonedDateTime_compare(JSContext* cx, unsigned argc, Value* vp) {
 CallArgs args = CallArgsFromVp(argc, vp);

 // Step 1.
 Rooted<ZonedDateTime> one(cx);
 if (!ToTemporalZonedDateTime(cx, args.get(0), &one)) {
   return false;
 }

 // Step 2.
 Rooted<ZonedDateTime> two(cx);
 if (!ToTemporalZonedDateTime(cx, args.get(1), &two)) {
   return false;
 }

 // Step 3.
 const auto& oneNs = one.epochNanoseconds();
 const auto& twoNs = two.epochNanoseconds();
 args.rval().setInt32(oneNs > twoNs ? 1 : oneNs < twoNs ? -1 : 0);
 return true;
}

/**
* get Temporal.ZonedDateTime.prototype.calendarId
*/
static bool ZonedDateTime_calendarId(JSContext* cx, const CallArgs& args) {
 auto* zonedDateTime = &args.thisv().toObject().as<ZonedDateTimeObject>();

 // Step 3.
 auto* str =
     NewStringCopy<CanGC>(cx, CalendarIdentifier(zonedDateTime->calendar()));
 if (!str) {
   return false;
 }

 args.rval().setString(str);
 return true;
}

/**
* get Temporal.ZonedDateTime.prototype.calendarId
*/
static bool ZonedDateTime_calendarId(JSContext* cx, unsigned argc, Value* vp) {
 // Steps 1-2.
 CallArgs args = CallArgsFromVp(argc, vp);
 return CallNonGenericMethod<IsZonedDateTime, ZonedDateTime_calendarId>(cx,
                                                                        args);
}

/**
* get Temporal.ZonedDateTime.prototype.timeZoneId
*/
static bool ZonedDateTime_timeZoneId(JSContext* cx, const CallArgs& args) {
 auto* zonedDateTime = &args.thisv().toObject().as<ZonedDateTimeObject>();

 // Step 3.
 args.rval().setString(zonedDateTime->timeZone().identifier());
 return true;
}

/**
* get Temporal.ZonedDateTime.prototype.timeZoneId
*/
static bool ZonedDateTime_timeZoneId(JSContext* cx, unsigned argc, Value* vp) {
 // Steps 1-2.
 CallArgs args = CallArgsFromVp(argc, vp);
 return CallNonGenericMethod<IsZonedDateTime, ZonedDateTime_timeZoneId>(cx,
                                                                        args);
}

/**
* get Temporal.ZonedDateTime.prototype.era
*/
static bool ZonedDateTime_era(JSContext* cx, const CallArgs& args) {
 Rooted<ZonedDateTime> zonedDateTime(
     cx, ZonedDateTime{&args.thisv().toObject().as<ZonedDateTimeObject>()});

 // Step 3.
 ISODateTime dateTime;
 if (!GetISODateTimeFor(cx, zonedDateTime.timeZone(),
                        zonedDateTime.epochNanoseconds(), &dateTime)) {
   return false;
 }

 // Step 4.
 return CalendarEra(cx, zonedDateTime.calendar(), dateTime.date, args.rval());
}

/**
* get Temporal.ZonedDateTime.prototype.era
*/
static bool ZonedDateTime_era(JSContext* cx, unsigned argc, Value* vp) {
 // Steps 1-2.
 CallArgs args = CallArgsFromVp(argc, vp);
 return CallNonGenericMethod<IsZonedDateTime, ZonedDateTime_era>(cx, args);
}

/**
* get Temporal.ZonedDateTime.prototype.eraYear
*/
static bool ZonedDateTime_eraYear(JSContext* cx, const CallArgs& args) {
 Rooted<ZonedDateTime> zonedDateTime(
     cx, ZonedDateTime{&args.thisv().toObject().as<ZonedDateTimeObject>()});

 // Step 3.
 ISODateTime dateTime;
 if (!GetISODateTimeFor(cx, zonedDateTime.timeZone(),
                        zonedDateTime.epochNanoseconds(), &dateTime)) {
   return false;
 }

 // Steps 4-6.
 return CalendarEraYear(cx, zonedDateTime.calendar(), dateTime.date,
                        args.rval());
}

/**
* get Temporal.ZonedDateTime.prototype.eraYear
*/
static bool ZonedDateTime_eraYear(JSContext* cx, unsigned argc, Value* vp) {
 // Steps 1-2.
 CallArgs args = CallArgsFromVp(argc, vp);
 return CallNonGenericMethod<IsZonedDateTime, ZonedDateTime_eraYear>(cx, args);
}

/**
* get Temporal.ZonedDateTime.prototype.year
*/
static bool ZonedDateTime_year(JSContext* cx, const CallArgs& args) {
 Rooted<ZonedDateTime> zonedDateTime(
     cx, ZonedDateTime{&args.thisv().toObject().as<ZonedDateTimeObject>()});

 // Step 3.
 ISODateTime dateTime;
 if (!GetISODateTimeFor(cx, zonedDateTime.timeZone(),
                        zonedDateTime.epochNanoseconds(), &dateTime)) {
   return false;
 }

 // Step 4.
 return CalendarYear(cx, zonedDateTime.calendar(), dateTime.date, args.rval());
}

/**
* get Temporal.ZonedDateTime.prototype.year
*/
static bool ZonedDateTime_year(JSContext* cx, unsigned argc, Value* vp) {
 // Steps 1-2.
 CallArgs args = CallArgsFromVp(argc, vp);
 return CallNonGenericMethod<IsZonedDateTime, ZonedDateTime_year>(cx, args);
}

/**
* get Temporal.ZonedDateTime.prototype.month
*/
static bool ZonedDateTime_month(JSContext* cx, const CallArgs& args) {
 Rooted<ZonedDateTime> zonedDateTime(
     cx, ZonedDateTime{&args.thisv().toObject().as<ZonedDateTimeObject>()});

 // Step 3.
 ISODateTime dateTime;
 if (!GetISODateTimeFor(cx, zonedDateTime.timeZone(),
                        zonedDateTime.epochNanoseconds(), &dateTime)) {
   return false;
 }

 // Step 4.
 return CalendarMonth(cx, zonedDateTime.calendar(), dateTime.date,
                      args.rval());
}

/**
* get Temporal.ZonedDateTime.prototype.month
*/
static bool ZonedDateTime_month(JSContext* cx, unsigned argc, Value* vp) {
 // Steps 1-2.
 CallArgs args = CallArgsFromVp(argc, vp);
 return CallNonGenericMethod<IsZonedDateTime, ZonedDateTime_month>(cx, args);
}

/**
* get Temporal.ZonedDateTime.prototype.monthCode
*/
static bool ZonedDateTime_monthCode(JSContext* cx, const CallArgs& args) {
 Rooted<ZonedDateTime> zonedDateTime(
     cx, ZonedDateTime{&args.thisv().toObject().as<ZonedDateTimeObject>()});

 // Step 3.
 ISODateTime dateTime;
 if (!GetISODateTimeFor(cx, zonedDateTime.timeZone(),
                        zonedDateTime.epochNanoseconds(), &dateTime)) {
   return false;
 }

 // Step 4.
 return CalendarMonthCode(cx, zonedDateTime.calendar(), dateTime.date,
                          args.rval());
}

/**
* get Temporal.ZonedDateTime.prototype.monthCode
*/
static bool ZonedDateTime_monthCode(JSContext* cx, unsigned argc, Value* vp) {
 // Steps 1-2.
 CallArgs args = CallArgsFromVp(argc, vp);
 return CallNonGenericMethod<IsZonedDateTime, ZonedDateTime_monthCode>(cx,
                                                                       args);
}

/**
* get Temporal.ZonedDateTime.prototype.day
*/
static bool ZonedDateTime_day(JSContext* cx, const CallArgs& args) {
 Rooted<ZonedDateTime> zonedDateTime(
     cx, ZonedDateTime{&args.thisv().toObject().as<ZonedDateTimeObject>()});

 // Step 3.
 ISODateTime dateTime;
 if (!GetISODateTimeFor(cx, zonedDateTime.timeZone(),
                        zonedDateTime.epochNanoseconds(), &dateTime)) {
   return false;
 }

 // Step 4.
 return CalendarDay(cx, zonedDateTime.calendar(), dateTime.date, args.rval());
}

/**
* get Temporal.ZonedDateTime.prototype.day
*/
static bool ZonedDateTime_day(JSContext* cx, unsigned argc, Value* vp) {
 // Steps 1-2.
 CallArgs args = CallArgsFromVp(argc, vp);
 return CallNonGenericMethod<IsZonedDateTime, ZonedDateTime_day>(cx, args);
}

/**
* get Temporal.ZonedDateTime.prototype.hour
*/
static bool ZonedDateTime_hour(JSContext* cx, const CallArgs& args) {
 Rooted<ZonedDateTime> zonedDateTime(
     cx, ZonedDateTime{&args.thisv().toObject().as<ZonedDateTimeObject>()});

 // Step 3.
 ISODateTime dateTime;
 if (!GetISODateTimeFor(cx, zonedDateTime.timeZone(),
                        zonedDateTime.epochNanoseconds(), &dateTime)) {
   return false;
 }

 // Step 4.
 args.rval().setInt32(dateTime.time.hour);
 return true;
}

/**
* get Temporal.ZonedDateTime.prototype.hour
*/
static bool ZonedDateTime_hour(JSContext* cx, unsigned argc, Value* vp) {
 // Steps 1-2.
 CallArgs args = CallArgsFromVp(argc, vp);
 return CallNonGenericMethod<IsZonedDateTime, ZonedDateTime_hour>(cx, args);
}

/**
* get Temporal.ZonedDateTime.prototype.minute
*/
static bool ZonedDateTime_minute(JSContext* cx, const CallArgs& args) {
 Rooted<ZonedDateTime> zonedDateTime(
     cx, ZonedDateTime{&args.thisv().toObject().as<ZonedDateTimeObject>()});

 // Step 3.
 ISODateTime dateTime;
 if (!GetISODateTimeFor(cx, zonedDateTime.timeZone(),
                        zonedDateTime.epochNanoseconds(), &dateTime)) {
   return false;
 }

 // Step 4.
 args.rval().setInt32(dateTime.time.minute);
 return true;
}

/**
* get Temporal.ZonedDateTime.prototype.minute
*/
static bool ZonedDateTime_minute(JSContext* cx, unsigned argc, Value* vp) {
 // Steps 1-2.
 CallArgs args = CallArgsFromVp(argc, vp);
 return CallNonGenericMethod<IsZonedDateTime, ZonedDateTime_minute>(cx, args);
}

/**
* get Temporal.ZonedDateTime.prototype.second
*/
static bool ZonedDateTime_second(JSContext* cx, const CallArgs& args) {
 Rooted<ZonedDateTime> zonedDateTime(
     cx, ZonedDateTime{&args.thisv().toObject().as<ZonedDateTimeObject>()});

 // Step 3.
 ISODateTime dateTime;
 if (!GetISODateTimeFor(cx, zonedDateTime.timeZone(),
                        zonedDateTime.epochNanoseconds(), &dateTime)) {
   return false;
 }

 // Step 4.
 args.rval().setInt32(dateTime.time.second);
 return true;
}

/**
* get Temporal.ZonedDateTime.prototype.second
*/
static bool ZonedDateTime_second(JSContext* cx, unsigned argc, Value* vp) {
 // Steps 1-2.
 CallArgs args = CallArgsFromVp(argc, vp);
 return CallNonGenericMethod<IsZonedDateTime, ZonedDateTime_second>(cx, args);
}

/**
* get Temporal.ZonedDateTime.prototype.millisecond
*/
static bool ZonedDateTime_millisecond(JSContext* cx, const CallArgs& args) {
 Rooted<ZonedDateTime> zonedDateTime(
     cx, ZonedDateTime{&args.thisv().toObject().as<ZonedDateTimeObject>()});

 // Step 3.
 ISODateTime dateTime;
 if (!GetISODateTimeFor(cx, zonedDateTime.timeZone(),
                        zonedDateTime.epochNanoseconds(), &dateTime)) {
   return false;
 }

 // Step 4.
 args.rval().setInt32(dateTime.time.millisecond);
 return true;
}

/**
* get Temporal.ZonedDateTime.prototype.millisecond
*/
static bool ZonedDateTime_millisecond(JSContext* cx, unsigned argc, Value* vp) {
 // Steps 1-2.
 CallArgs args = CallArgsFromVp(argc, vp);
 return CallNonGenericMethod<IsZonedDateTime, ZonedDateTime_millisecond>(cx,
                                                                         args);
}

/**
* get Temporal.ZonedDateTime.prototype.microsecond
*/
static bool ZonedDateTime_microsecond(JSContext* cx, const CallArgs& args) {
 Rooted<ZonedDateTime> zonedDateTime(
     cx, ZonedDateTime{&args.thisv().toObject().as<ZonedDateTimeObject>()});

 // Step 3.
 ISODateTime dateTime;
 if (!GetISODateTimeFor(cx, zonedDateTime.timeZone(),
                        zonedDateTime.epochNanoseconds(), &dateTime)) {
   return false;
 }

 // Step 4.
 args.rval().setInt32(dateTime.time.microsecond);
 return true;
}

/**
* get Temporal.ZonedDateTime.prototype.microsecond
*/
static bool ZonedDateTime_microsecond(JSContext* cx, unsigned argc, Value* vp) {
 // Steps 1-2.
 CallArgs args = CallArgsFromVp(argc, vp);
 return CallNonGenericMethod<IsZonedDateTime, ZonedDateTime_microsecond>(cx,
                                                                         args);
}

/**
* get Temporal.ZonedDateTime.prototype.nanosecond
*/
static bool ZonedDateTime_nanosecond(JSContext* cx, const CallArgs& args) {
 Rooted<ZonedDateTime> zonedDateTime(
     cx, ZonedDateTime{&args.thisv().toObject().as<ZonedDateTimeObject>()});

 // Step 3.
 ISODateTime dateTime;
 if (!GetISODateTimeFor(cx, zonedDateTime.timeZone(),
                        zonedDateTime.epochNanoseconds(), &dateTime)) {
   return false;
 }

 // Step 4.
 args.rval().setInt32(dateTime.time.nanosecond);
 return true;
}

/**
* get Temporal.ZonedDateTime.prototype.nanosecond
*/
static bool ZonedDateTime_nanosecond(JSContext* cx, unsigned argc, Value* vp) {
 // Steps 1-2.
 CallArgs args = CallArgsFromVp(argc, vp);
 return CallNonGenericMethod<IsZonedDateTime, ZonedDateTime_nanosecond>(cx,
                                                                        args);
}

/**
* get Temporal.ZonedDateTime.prototype.epochMilliseconds
*/
static bool ZonedDateTime_epochMilliseconds(JSContext* cx,
                                           const CallArgs& args) {
 auto* zonedDateTime = &args.thisv().toObject().as<ZonedDateTimeObject>();

 // Step 3.
 auto epochNs = zonedDateTime->epochNanoseconds();

 // Steps 4-5.
 args.rval().setNumber(epochNs.floorToMilliseconds());
 return true;
}

/**
* get Temporal.ZonedDateTime.prototype.epochMilliseconds
*/
static bool ZonedDateTime_epochMilliseconds(JSContext* cx, unsigned argc,
                                           Value* vp) {
 // Steps 1-2.
 CallArgs args = CallArgsFromVp(argc, vp);
 return CallNonGenericMethod<IsZonedDateTime, ZonedDateTime_epochMilliseconds>(
     cx, args);
}

/**
* get Temporal.ZonedDateTime.prototype.epochNanoseconds
*/
static bool ZonedDateTime_epochNanoseconds(JSContext* cx,
                                          const CallArgs& args) {
 auto* zonedDateTime = &args.thisv().toObject().as<ZonedDateTimeObject>();

 // Step 3.
 auto* nanoseconds = ToBigInt(cx, zonedDateTime->epochNanoseconds());
 if (!nanoseconds) {
   return false;
 }

 args.rval().setBigInt(nanoseconds);
 return true;
}

/**
* get Temporal.ZonedDateTime.prototype.epochNanoseconds
*/
static bool ZonedDateTime_epochNanoseconds(JSContext* cx, unsigned argc,
                                          Value* vp) {
 // Steps 1-2.
 CallArgs args = CallArgsFromVp(argc, vp);
 return CallNonGenericMethod<IsZonedDateTime, ZonedDateTime_epochNanoseconds>(
     cx, args);
}

/**
* get Temporal.ZonedDateTime.prototype.dayOfWeek
*/
static bool ZonedDateTime_dayOfWeek(JSContext* cx, const CallArgs& args) {
 Rooted<ZonedDateTime> zonedDateTime(
     cx, ZonedDateTime{&args.thisv().toObject().as<ZonedDateTimeObject>()});

 // Step 3.
 ISODateTime dateTime;
 if (!GetISODateTimeFor(cx, zonedDateTime.timeZone(),
                        zonedDateTime.epochNanoseconds(), &dateTime)) {
   return false;
 }

 // Step 4.
 return CalendarDayOfWeek(cx, zonedDateTime.calendar(), dateTime.date,
                          args.rval());
}

/**
* get Temporal.ZonedDateTime.prototype.dayOfWeek
*/
static bool ZonedDateTime_dayOfWeek(JSContext* cx, unsigned argc, Value* vp) {
 // Steps 1-2.
 CallArgs args = CallArgsFromVp(argc, vp);
 return CallNonGenericMethod<IsZonedDateTime, ZonedDateTime_dayOfWeek>(cx,
                                                                       args);
}

/**
* get Temporal.ZonedDateTime.prototype.dayOfYear
*/
static bool ZonedDateTime_dayOfYear(JSContext* cx, const CallArgs& args) {
 Rooted<ZonedDateTime> zonedDateTime(
     cx, ZonedDateTime{&args.thisv().toObject().as<ZonedDateTimeObject>()});

 // Step 3.
 ISODateTime dateTime;
 if (!GetISODateTimeFor(cx, zonedDateTime.timeZone(),
                        zonedDateTime.epochNanoseconds(), &dateTime)) {
   return false;
 }

 // Step 4.
 return CalendarDayOfYear(cx, zonedDateTime.calendar(), dateTime.date,
                          args.rval());
}

/**
* get Temporal.ZonedDateTime.prototype.dayOfYear
*/
static bool ZonedDateTime_dayOfYear(JSContext* cx, unsigned argc, Value* vp) {
 // Steps 1-2.
 CallArgs args = CallArgsFromVp(argc, vp);
 return CallNonGenericMethod<IsZonedDateTime, ZonedDateTime_dayOfYear>(cx,
                                                                       args);
}

/**
* get Temporal.ZonedDateTime.prototype.weekOfYear
*/
static bool ZonedDateTime_weekOfYear(JSContext* cx, const CallArgs& args) {
 Rooted<ZonedDateTime> zonedDateTime(
     cx, ZonedDateTime{&args.thisv().toObject().as<ZonedDateTimeObject>()});

 // Step 3.
 ISODateTime dateTime;
 if (!GetISODateTimeFor(cx, zonedDateTime.timeZone(),
                        zonedDateTime.epochNanoseconds(), &dateTime)) {
   return false;
 }

 // Steps 4-6.
 return CalendarWeekOfYear(cx, zonedDateTime.calendar(), dateTime.date,
                           args.rval());
}

/**
* get Temporal.ZonedDateTime.prototype.weekOfYear
*/
static bool ZonedDateTime_weekOfYear(JSContext* cx, unsigned argc, Value* vp) {
 // Steps 1-2.
 CallArgs args = CallArgsFromVp(argc, vp);
 return CallNonGenericMethod<IsZonedDateTime, ZonedDateTime_weekOfYear>(cx,
                                                                        args);
}

/**
* get Temporal.ZonedDateTime.prototype.yearOfWeek
*/
static bool ZonedDateTime_yearOfWeek(JSContext* cx, const CallArgs& args) {
 Rooted<ZonedDateTime> zonedDateTime(
     cx, ZonedDateTime{&args.thisv().toObject().as<ZonedDateTimeObject>()});

 // Step 3.
 ISODateTime dateTime;
 if (!GetISODateTimeFor(cx, zonedDateTime.timeZone(),
                        zonedDateTime.epochNanoseconds(), &dateTime)) {
   return false;
 }

 // Steps 4-6.
 return CalendarYearOfWeek(cx, zonedDateTime.calendar(), dateTime.date,
                           args.rval());
}

/**
* get Temporal.ZonedDateTime.prototype.yearOfWeek
*/
static bool ZonedDateTime_yearOfWeek(JSContext* cx, unsigned argc, Value* vp) {
 // Steps 1-2.
 CallArgs args = CallArgsFromVp(argc, vp);
 return CallNonGenericMethod<IsZonedDateTime, ZonedDateTime_yearOfWeek>(cx,
                                                                        args);
}

/**
* get Temporal.ZonedDateTime.prototype.hoursInDay
*/
static bool ZonedDateTime_hoursInDay(JSContext* cx, const CallArgs& args) {
 Rooted<ZonedDateTime> zonedDateTime(
     cx, ZonedDateTime{&args.thisv().toObject().as<ZonedDateTimeObject>()});

 // Step 3.
 auto timeZone = zonedDateTime.timeZone();

 // Step 4.
 ISODateTime dateTime;
 if (!GetISODateTimeFor(cx, timeZone, zonedDateTime.epochNanoseconds(),
                        &dateTime)) {
   return false;
 }

 // Step 5.
 const auto& today = dateTime.date;

 // Step 6.
 auto tomorrow = BalanceISODate(today, 1);
 if (!ISODateWithinLimits(tomorrow)) {
   JS_ReportErrorNumberASCII(cx, GetErrorMessage, nullptr,
                             JSMSG_TEMPORAL_PLAIN_DATE_INVALID);
   return false;
 }

 // Step 7.
 EpochNanoseconds todayNs;
 if (!GetStartOfDay(cx, timeZone, today, &todayNs)) {
   return false;
 }

 // Step 8.
 EpochNanoseconds tomorrowNs;
 if (!GetStartOfDay(cx, timeZone, tomorrow, &tomorrowNs)) {
   return false;
 }

 // Step 9.
 auto diff = tomorrowNs - todayNs;
 MOZ_ASSERT(diff.abs() <= EpochDuration::fromDays(2),
            "maximum day length for repeated days doesn't exceed two days");

 static_assert(EpochDuration::fromDays(2).toNanoseconds() < Int128{INT64_MAX},
               "two days in nanoseconds fits into int64_t");

 // Step 10. (Inlined TotalTimeDuration)
 constexpr auto nsPerHour = ToNanoseconds(TemporalUnit::Hour);
 args.rval().setNumber(
     FractionToDouble(int64_t(diff.toNanoseconds()), nsPerHour));
 return true;
}

/**
* get Temporal.ZonedDateTime.prototype.hoursInDay
*/
static bool ZonedDateTime_hoursInDay(JSContext* cx, unsigned argc, Value* vp) {
 // Steps 1-2.
 CallArgs args = CallArgsFromVp(argc, vp);
 return CallNonGenericMethod<IsZonedDateTime, ZonedDateTime_hoursInDay>(cx,
                                                                        args);
}

/**
* get Temporal.ZonedDateTime.prototype.daysInWeek
*/
static bool ZonedDateTime_daysInWeek(JSContext* cx, const CallArgs& args) {
 Rooted<ZonedDateTime> zonedDateTime(
     cx, ZonedDateTime{&args.thisv().toObject().as<ZonedDateTimeObject>()});

 // Step 3.
 ISODateTime dateTime;
 if (!GetISODateTimeFor(cx, zonedDateTime.timeZone(),
                        zonedDateTime.epochNanoseconds(), &dateTime)) {
   return false;
 }

 // Step 4.
 return CalendarDaysInWeek(cx, zonedDateTime.calendar(), dateTime.date,
                           args.rval());
}

/**
* get Temporal.ZonedDateTime.prototype.daysInWeek
*/
static bool ZonedDateTime_daysInWeek(JSContext* cx, unsigned argc, Value* vp) {
 // Steps 1-2.
 CallArgs args = CallArgsFromVp(argc, vp);
 return CallNonGenericMethod<IsZonedDateTime, ZonedDateTime_daysInWeek>(cx,
                                                                        args);
}

/**
* get Temporal.ZonedDateTime.prototype.daysInMonth
*/
static bool ZonedDateTime_daysInMonth(JSContext* cx, const CallArgs& args) {
 Rooted<ZonedDateTime> zonedDateTime(
     cx, ZonedDateTime{&args.thisv().toObject().as<ZonedDateTimeObject>()});

 // Step 3.
 ISODateTime dateTime;
 if (!GetISODateTimeFor(cx, zonedDateTime.timeZone(),
                        zonedDateTime.epochNanoseconds(), &dateTime)) {
   return false;
 }

 // Step 4.
 return CalendarDaysInMonth(cx, zonedDateTime.calendar(), dateTime.date,
                            args.rval());
}

/**
* get Temporal.ZonedDateTime.prototype.daysInMonth
*/
static bool ZonedDateTime_daysInMonth(JSContext* cx, unsigned argc, Value* vp) {
 // Steps 1-2.
 CallArgs args = CallArgsFromVp(argc, vp);
 return CallNonGenericMethod<IsZonedDateTime, ZonedDateTime_daysInMonth>(cx,
                                                                         args);
}

/**
* get Temporal.ZonedDateTime.prototype.daysInYear
*/
static bool ZonedDateTime_daysInYear(JSContext* cx, const CallArgs& args) {
 Rooted<ZonedDateTime> zonedDateTime(
     cx, ZonedDateTime{&args.thisv().toObject().as<ZonedDateTimeObject>()});

 // Step 3.
 ISODateTime dateTime;
 if (!GetISODateTimeFor(cx, zonedDateTime.timeZone(),
                        zonedDateTime.epochNanoseconds(), &dateTime)) {
   return false;
 }

 // Step 4.
 return CalendarDaysInYear(cx, zonedDateTime.calendar(), dateTime.date,
                           args.rval());
}

/**
* get Temporal.ZonedDateTime.prototype.daysInYear
*/
static bool ZonedDateTime_daysInYear(JSContext* cx, unsigned argc, Value* vp) {
 // Steps 1-2.
 CallArgs args = CallArgsFromVp(argc, vp);
 return CallNonGenericMethod<IsZonedDateTime, ZonedDateTime_daysInYear>(cx,
                                                                        args);
}

/**
* get Temporal.ZonedDateTime.prototype.monthsInYear
*/
static bool ZonedDateTime_monthsInYear(JSContext* cx, const CallArgs& args) {
 Rooted<ZonedDateTime> zonedDateTime(
     cx, ZonedDateTime{&args.thisv().toObject().as<ZonedDateTimeObject>()});

 // Step 3.
 ISODateTime dateTime;
 if (!GetISODateTimeFor(cx, zonedDateTime.timeZone(),
                        zonedDateTime.epochNanoseconds(), &dateTime)) {
   return false;
 }

 // Step 4.
 return CalendarMonthsInYear(cx, zonedDateTime.calendar(), dateTime.date,
                             args.rval());
}

/**
* get Temporal.ZonedDateTime.prototype.monthsInYear
*/
static bool ZonedDateTime_monthsInYear(JSContext* cx, unsigned argc,
                                      Value* vp) {
 // Steps 1-2.
 CallArgs args = CallArgsFromVp(argc, vp);
 return CallNonGenericMethod<IsZonedDateTime, ZonedDateTime_monthsInYear>(
     cx, args);
}

/**
* get Temporal.ZonedDateTime.prototype.inLeapYear
*/
static bool ZonedDateTime_inLeapYear(JSContext* cx, const CallArgs& args) {
 Rooted<ZonedDateTime> zonedDateTime(
     cx, ZonedDateTime{&args.thisv().toObject().as<ZonedDateTimeObject>()});

 // Step 3.
 ISODateTime dateTime;
 if (!GetISODateTimeFor(cx, zonedDateTime.timeZone(),
                        zonedDateTime.epochNanoseconds(), &dateTime)) {
   return false;
 }

 // Step 4.
 return CalendarInLeapYear(cx, zonedDateTime.calendar(), dateTime.date,
                           args.rval());
}

/**
* get Temporal.ZonedDateTime.prototype.inLeapYear
*/
static bool ZonedDateTime_inLeapYear(JSContext* cx, unsigned argc, Value* vp) {
 // Steps 1-2.
 CallArgs args = CallArgsFromVp(argc, vp);
 return CallNonGenericMethod<IsZonedDateTime, ZonedDateTime_inLeapYear>(cx,
                                                                        args);
}

/**
* get Temporal.ZonedDateTime.prototype.offsetNanoseconds
*/
static bool ZonedDateTime_offsetNanoseconds(JSContext* cx,
                                           const CallArgs& args) {
 Rooted<ZonedDateTime> zonedDateTime(
     cx, ZonedDateTime{&args.thisv().toObject().as<ZonedDateTimeObject>()});

 // Step 3.
 int64_t offsetNanoseconds;
 if (!GetOffsetNanosecondsFor(cx, zonedDateTime.timeZone(),
                              zonedDateTime.epochNanoseconds(),
                              &offsetNanoseconds)) {
   return false;
 }
 MOZ_ASSERT(std::abs(offsetNanoseconds) < ToNanoseconds(TemporalUnit::Day));

 args.rval().setNumber(offsetNanoseconds);
 return true;
}

/**
* get Temporal.ZonedDateTime.prototype.offsetNanoseconds
*/
static bool ZonedDateTime_offsetNanoseconds(JSContext* cx, unsigned argc,
                                           Value* vp) {
 // Steps 1-2.
 CallArgs args = CallArgsFromVp(argc, vp);
 return CallNonGenericMethod<IsZonedDateTime, ZonedDateTime_offsetNanoseconds>(
     cx, args);
}

/**
* get Temporal.ZonedDateTime.prototype.offset
*/
static bool ZonedDateTime_offset(JSContext* cx, const CallArgs& args) {
 Rooted<ZonedDateTime> zonedDateTime(
     cx, ZonedDateTime{&args.thisv().toObject().as<ZonedDateTimeObject>()});

 // Step 3.
 int64_t offsetNanoseconds;
 if (!GetOffsetNanosecondsFor(cx, zonedDateTime.timeZone(),
                              zonedDateTime.epochNanoseconds(),
                              &offsetNanoseconds)) {
   return false;
 }
 MOZ_ASSERT(std::abs(offsetNanoseconds) < ToNanoseconds(TemporalUnit::Day));

 // Step 4.
 JSString* str = FormatUTCOffsetNanoseconds(cx, offsetNanoseconds);
 if (!str) {
   return false;
 }

 args.rval().setString(str);
 return true;
}

/**
* get Temporal.ZonedDateTime.prototype.offset
*/
static bool ZonedDateTime_offset(JSContext* cx, unsigned argc, Value* vp) {
 // Steps 1-2.
 CallArgs args = CallArgsFromVp(argc, vp);
 return CallNonGenericMethod<IsZonedDateTime, ZonedDateTime_offset>(cx, args);
}

/**
* Temporal.ZonedDateTime.prototype.with ( temporalZonedDateTimeLike [ , options
* ] )
*/
static bool ZonedDateTime_with(JSContext* cx, const CallArgs& args) {
 Rooted<ZonedDateTime> zonedDateTime(
     cx, ZonedDateTime{&args.thisv().toObject().as<ZonedDateTimeObject>()});

 // Step 3.
 Rooted<JSObject*> temporalZonedDateTimeLike(
     cx,
     RequireObjectArg(cx, "temporalZonedDateTimeLike", "with", args.get(0)));
 if (!temporalZonedDateTimeLike) {
   return false;
 }
 if (!ThrowIfTemporalLikeObject(cx, temporalZonedDateTimeLike)) {
   return false;
 }

 // Step 4.
 const auto& epochNs = zonedDateTime.epochNanoseconds();

 // Step 5.
 auto timeZone = zonedDateTime.timeZone();

 // Step 6.
 auto calendar = zonedDateTime.calendar();

 // Step 7.
 int64_t offsetNanoseconds;
 if (!GetOffsetNanosecondsFor(cx, timeZone, epochNs, &offsetNanoseconds)) {
   return false;
 }

 // Step 8.
 auto dateTime = GetISODateTimeFor(epochNs, offsetNanoseconds);
 MOZ_ASSERT(ISODateTimeWithinLimits(dateTime));

 // Step 9.
 Rooted<PlainDate> date(cx, PlainDate{dateTime.date, calendar});
 Rooted<CalendarFields> fields(cx);
 if (!ISODateToFields(cx, date, &fields)) {
   return false;
 }

 // Steps 10-16.
 fields.setHour(dateTime.time.hour);
 fields.setMinute(dateTime.time.minute);
 fields.setSecond(dateTime.time.second);
 fields.setMillisecond(dateTime.time.millisecond);
 fields.setMicrosecond(dateTime.time.microsecond);
 fields.setNanosecond(dateTime.time.nanosecond);
 fields.setOffset(OffsetField{offsetNanoseconds});

 // Step 17.
 Rooted<CalendarFields> partialZonedDateTime(cx);
 if (!PreparePartialCalendarFields(cx, calendar, temporalZonedDateTimeLike,
                                   {
                                       CalendarField::Year,
                                       CalendarField::Month,
                                       CalendarField::MonthCode,
                                       CalendarField::Day,
                                       CalendarField::Hour,
                                       CalendarField::Minute,
                                       CalendarField::Second,
                                       CalendarField::Millisecond,
                                       CalendarField::Microsecond,
                                       CalendarField::Nanosecond,
                                       CalendarField::Offset,
                                   },
                                   &partialZonedDateTime)) {
   return false;
 }
 MOZ_ASSERT(!partialZonedDateTime.keys().isEmpty());

 // Step 18.
 fields = CalendarMergeFields(calendar, fields, partialZonedDateTime);

 // Steps 19-22.
 auto disambiguation = TemporalDisambiguation::Compatible;
 auto offset = TemporalOffset::Prefer;
 auto overflow = TemporalOverflow::Constrain;
 if (args.hasDefined(1)) {
   // Step 19.
   Rooted<JSObject*> options(cx,
                             RequireObjectArg(cx, "options", "with", args[1]));
   if (!options) {
     return false;
   }

   // Step 20.
   if (!GetTemporalDisambiguationOption(cx, options, &disambiguation)) {
     return false;
   }

   // Step 21.
   if (!GetTemporalOffsetOption(cx, options, &offset)) {
     return false;
   }

   // Step 22.
   if (!GetTemporalOverflowOption(cx, options, &overflow)) {
     return false;
   }
 }

 // Step 23.
 ISODateTime dateTimeResult;
 if (!InterpretTemporalDateTimeFields(cx, calendar, fields, overflow,
                                      &dateTimeResult)) {
   return false;
 }

 // Step 24.
 int64_t newOffsetNanoseconds = int64_t(fields.offset());

 // Step 25.
 EpochNanoseconds epochNanoseconds;
 if (!InterpretISODateTimeOffset(
         cx, dateTimeResult, OffsetBehaviour::Option, newOffsetNanoseconds,
         timeZone, disambiguation, offset, MatchBehaviour::MatchExactly,
         &epochNanoseconds)) {
   return false;
 }

 // Step 26.
 auto* result =
     CreateTemporalZonedDateTime(cx, epochNanoseconds, timeZone, calendar);
 if (!result) {
   return false;
 }

 args.rval().setObject(*result);
 return true;
}

/**
* Temporal.ZonedDateTime.prototype.with ( temporalZonedDateTimeLike [ , options
* ] )
*/
static bool ZonedDateTime_with(JSContext* cx, unsigned argc, Value* vp) {
 // Steps 1-2.
 CallArgs args = CallArgsFromVp(argc, vp);
 return CallNonGenericMethod<IsZonedDateTime, ZonedDateTime_with>(cx, args);
}

/**
* Temporal.ZonedDateTime.prototype.withPlainTime ( [ plainTimeLike ] )
*/
static bool ZonedDateTime_withPlainTime(JSContext* cx, const CallArgs& args) {
 Rooted<ZonedDateTime> zonedDateTime(
     cx, ZonedDateTime{&args.thisv().toObject().as<ZonedDateTimeObject>()});

 // Step 3.
 auto timeZone = zonedDateTime.timeZone();

 // Step 4.
 auto calendar = zonedDateTime.calendar();

 // Step 5.
 ISODateTime isoDateTime;
 if (!GetISODateTimeFor(cx, timeZone, zonedDateTime.epochNanoseconds(),
                        &isoDateTime)) {
   return false;
 }

 // Steps 6-7.
 EpochNanoseconds epochNs;
 if (!args.hasDefined(0)) {
   // Step 6.a.
   if (!GetStartOfDay(cx, timeZone, isoDateTime.date, &epochNs)) {
     return false;
   }
 } else {
   // Step 7.a.
   Time time;
   if (!ToTemporalTime(cx, args[0], &time)) {
     return false;
   }

   // Step 7.b.
   auto resultISODateTime = ISODateTime{isoDateTime.date, time};
   if (!ISODateTimeWithinLimits(resultISODateTime)) {
     JS_ReportErrorNumberASCII(cx, GetErrorMessage, nullptr,
                               JSMSG_TEMPORAL_PLAIN_DATE_TIME_INVALID);
     return false;
   }

   // Step 7.c.
   if (!GetEpochNanosecondsFor(cx, timeZone, resultISODateTime,
                               TemporalDisambiguation::Compatible, &epochNs)) {
     return false;
   }
 }

 // Step 8.
 auto* result = CreateTemporalZonedDateTime(cx, epochNs, timeZone, calendar);
 if (!result) {
   return false;
 }

 args.rval().setObject(*result);
 return true;
}

/**
* Temporal.ZonedDateTime.prototype.withPlainTime ( [ plainTimeLike ] )
*/
static bool ZonedDateTime_withPlainTime(JSContext* cx, unsigned argc,
                                       Value* vp) {
 // Steps 1-2.
 CallArgs args = CallArgsFromVp(argc, vp);
 return CallNonGenericMethod<IsZonedDateTime, ZonedDateTime_withPlainTime>(
     cx, args);
}

/**
* Temporal.ZonedDateTime.prototype.withTimeZone ( timeZoneLike )
*/
static bool ZonedDateTime_withTimeZone(JSContext* cx, const CallArgs& args) {
 Rooted<ZonedDateTime> zonedDateTime(
     cx, ZonedDateTime{&args.thisv().toObject().as<ZonedDateTimeObject>()});

 // Step 3.
 Rooted<TimeZoneValue> timeZone(cx);
 if (!ToTemporalTimeZone(cx, args.get(0), &timeZone)) {
   return false;
 }

 // Step 4.
 auto* result = CreateTemporalZonedDateTime(
     cx, zonedDateTime.epochNanoseconds(), timeZone, zonedDateTime.calendar());
 if (!result) {
   return false;
 }

 args.rval().setObject(*result);
 return true;
}

/**
* Temporal.ZonedDateTime.prototype.withTimeZone ( timeZoneLike )
*/
static bool ZonedDateTime_withTimeZone(JSContext* cx, unsigned argc,
                                      Value* vp) {
 // Steps 1-2.
 CallArgs args = CallArgsFromVp(argc, vp);
 return CallNonGenericMethod<IsZonedDateTime, ZonedDateTime_withTimeZone>(
     cx, args);
}

/**
* Temporal.ZonedDateTime.prototype.withCalendar ( calendarLike )
*/
static bool ZonedDateTime_withCalendar(JSContext* cx, const CallArgs& args) {
 Rooted<ZonedDateTime> zonedDateTime(
     cx, ZonedDateTime{&args.thisv().toObject().as<ZonedDateTimeObject>()});

 // Step 3.
 Rooted<CalendarValue> calendar(cx);
 if (!ToTemporalCalendar(cx, args.get(0), &calendar)) {
   return false;
 }

 // Step 4.
 auto* result = CreateTemporalZonedDateTime(
     cx, zonedDateTime.epochNanoseconds(), zonedDateTime.timeZone(), calendar);
 if (!result) {
   return false;
 }

 args.rval().setObject(*result);
 return true;
}

/**
* Temporal.ZonedDateTime.prototype.withCalendar ( calendarLike )
*/
static bool ZonedDateTime_withCalendar(JSContext* cx, unsigned argc,
                                      Value* vp) {
 // Steps 1-2.
 CallArgs args = CallArgsFromVp(argc, vp);
 return CallNonGenericMethod<IsZonedDateTime, ZonedDateTime_withCalendar>(
     cx, args);
}

/**
* Temporal.ZonedDateTime.prototype.add ( temporalDurationLike [ , options ] )
*/
static bool ZonedDateTime_add(JSContext* cx, const CallArgs& args) {
 // Step 3.
 return AddDurationToZonedDateTime(cx, TemporalAddDuration::Add, args);
}

/**
* Temporal.ZonedDateTime.prototype.add ( temporalDurationLike [ , options ] )
*/
static bool ZonedDateTime_add(JSContext* cx, unsigned argc, Value* vp) {
 // Steps 1-2.
 CallArgs args = CallArgsFromVp(argc, vp);
 return CallNonGenericMethod<IsZonedDateTime, ZonedDateTime_add>(cx, args);
}

/**
* Temporal.ZonedDateTime.prototype.subtract ( temporalDurationLike [ , options
* ] )
*/
static bool ZonedDateTime_subtract(JSContext* cx, const CallArgs& args) {
 // Step 3.
 return AddDurationToZonedDateTime(cx, TemporalAddDuration::Subtract, args);
}

/**
* Temporal.ZonedDateTime.prototype.subtract ( temporalDurationLike [ , options
* ] )
*/
static bool ZonedDateTime_subtract(JSContext* cx, unsigned argc, Value* vp) {
 // Steps 1-2.
 CallArgs args = CallArgsFromVp(argc, vp);
 return CallNonGenericMethod<IsZonedDateTime, ZonedDateTime_subtract>(cx,
                                                                      args);
}

/**
* Temporal.ZonedDateTime.prototype.until ( other [ , options ] )
*/
static bool ZonedDateTime_until(JSContext* cx, const CallArgs& args) {
 // Step 3.
 return DifferenceTemporalZonedDateTime(cx, TemporalDifference::Until, args);
}

/**
* Temporal.ZonedDateTime.prototype.until ( other [ , options ] )
*/
static bool ZonedDateTime_until(JSContext* cx, unsigned argc, Value* vp) {
 // Steps 1-2.
 CallArgs args = CallArgsFromVp(argc, vp);
 return CallNonGenericMethod<IsZonedDateTime, ZonedDateTime_until>(cx, args);
}

/**
* Temporal.ZonedDateTime.prototype.since ( other [ , options ] )
*/
static bool ZonedDateTime_since(JSContext* cx, const CallArgs& args) {
 // Step 3.
 return DifferenceTemporalZonedDateTime(cx, TemporalDifference::Since, args);
}

/**
* Temporal.ZonedDateTime.prototype.since ( other [ , options ] )
*/
static bool ZonedDateTime_since(JSContext* cx, unsigned argc, Value* vp) {
 // Steps 1-2.
 CallArgs args = CallArgsFromVp(argc, vp);
 return CallNonGenericMethod<IsZonedDateTime, ZonedDateTime_since>(cx, args);
}

/**
* Temporal.ZonedDateTime.prototype.round ( roundTo )
*/
static bool ZonedDateTime_round(JSContext* cx, const CallArgs& args) {
 Rooted<ZonedDateTime> zonedDateTime(
     cx, ZonedDateTime{&args.thisv().toObject().as<ZonedDateTimeObject>()});

 // Steps 3-13.
 auto smallestUnit = TemporalUnit::Unset;
 auto roundingMode = TemporalRoundingMode::HalfExpand;
 auto roundingIncrement = Increment{1};
 if (args.get(0).isString()) {
   // Step 4. (Not applicable in our implementation.)

   // Step 9.
   Rooted<JSString*> paramString(cx, args[0].toString());
   if (!GetTemporalUnitValuedOption(
           cx, paramString, TemporalUnitKey::SmallestUnit, &smallestUnit)) {
     return false;
   }

   // Step 10.
   if (!ValidateTemporalUnitValue(cx, TemporalUnitKey::SmallestUnit,
                                  smallestUnit, TemporalUnitGroup::DayTime)) {
     return false;
   }

   // Steps 6-8 and 11-13. (Implicit)
 } else {
   // Steps 3 and 5.a
   Rooted<JSObject*> roundTo(
       cx, RequireObjectArg(cx, "roundTo", "round", args.get(0)));
   if (!roundTo) {
     return false;
   }

   // Steps 6-7.
   if (!GetRoundingIncrementOption(cx, roundTo, &roundingIncrement)) {
     return false;
   }

   // Step 8.
   if (!GetRoundingModeOption(cx, roundTo, &roundingMode)) {
     return false;
   }

   // Step 9.
   if (!GetTemporalUnitValuedOption(cx, roundTo, TemporalUnitKey::SmallestUnit,
                                    &smallestUnit)) {
     return false;
   }

   if (smallestUnit == TemporalUnit::Unset) {
     JS_ReportErrorNumberASCII(cx, GetErrorMessage, nullptr,
                               JSMSG_TEMPORAL_MISSING_OPTION, "smallestUnit");
     return false;
   }

   // Step 10.
   if (!ValidateTemporalUnitValue(cx, TemporalUnitKey::SmallestUnit,
                                  smallestUnit, TemporalUnitGroup::DayTime)) {
     return false;
   }
   MOZ_ASSERT(TemporalUnit::Day <= smallestUnit &&
              smallestUnit <= TemporalUnit::Nanosecond);

   // Steps 11-12.
   auto maximum = Increment{1};
   bool inclusive = true;
   if (smallestUnit > TemporalUnit::Day) {
     maximum = MaximumTemporalDurationRoundingIncrement(smallestUnit);
     inclusive = false;
   }

   // Step 13.
   if (!ValidateTemporalRoundingIncrement(cx, roundingIncrement, maximum,
                                          inclusive)) {
     return false;
   }
 }

 // Step 14.
 if (smallestUnit == TemporalUnit::Nanosecond &&
     roundingIncrement == Increment{1}) {
   // Step 14.a.
   auto* result = CreateTemporalZonedDateTime(
       cx, zonedDateTime.epochNanoseconds(), zonedDateTime.timeZone(),
       zonedDateTime.calendar());
   if (!result) {
     return false;
   }

   args.rval().setObject(*result);
   return true;
 }

 // Step 15.
 auto thisNs = zonedDateTime.epochNanoseconds();

 // Step 16.
 auto timeZone = zonedDateTime.timeZone();

 // Step 17.
 auto calendar = zonedDateTime.calendar();

 // Step 18.
 ISODateTime isoDateTime;
 if (!GetISODateTimeFor(cx, timeZone, thisNs, &isoDateTime)) {
   return false;
 }

 // Steps 19-20.
 EpochNanoseconds epochNanoseconds;
 if (smallestUnit == TemporalUnit::Day) {
   // Step 19.a.
   const auto& dateStart = isoDateTime.date;

   // Step 19.b.
   auto dateEnd = BalanceISODate(dateStart, 1);
   if (!ISODateWithinLimits(dateEnd)) {
     JS_ReportErrorNumberASCII(cx, GetErrorMessage, nullptr,
                               JSMSG_TEMPORAL_PLAIN_DATE_INVALID);
     return false;
   }

   // Step 19.c.
   EpochNanoseconds startNs;
   if (!GetStartOfDay(cx, timeZone, dateStart, &startNs)) {
     return false;
   }

   // Step 19.d.
   MOZ_ASSERT(thisNs >= startNs);

   // Step 19.e.
   EpochNanoseconds endNs;
   if (!GetStartOfDay(cx, timeZone, dateEnd, &endNs)) {
     return false;
   }

   // Step 19.f.
   MOZ_ASSERT(thisNs < endNs);

   // Step 19.g.
   auto dayLengthNs = endNs - startNs;
   MOZ_ASSERT(IsValidEpochDuration(dayLengthNs));
   MOZ_ASSERT(dayLengthNs > EpochDuration{}, "dayLengthNs is positive");

   // Step 19.h. (Inlined TimeDurationFromEpochNanosecondsDifference)
   auto dayProgressNs = thisNs - startNs;
   MOZ_ASSERT(IsValidEpochDuration(dayProgressNs));
   MOZ_ASSERT(dayProgressNs >= EpochDuration{},
              "dayProgressNs is non-negative");

   MOZ_ASSERT(startNs <= thisNs && thisNs < endNs);
   MOZ_ASSERT(dayProgressNs < dayLengthNs);
   MOZ_ASSERT(dayLengthNs <= EpochDuration::fromDays(2),
              "maximum day length for repeated days");

   // Step 19.i. (Inlined RoundTimeDurationToIncrement)
   auto rounded = RoundNumberToIncrement(
       static_cast<int64_t>(dayProgressNs.toNanoseconds()),
       static_cast<int64_t>(dayLengthNs.toNanoseconds()), roundingMode);
   auto roundedDaysNs = EpochDuration::fromNanoseconds(rounded);
   MOZ_ASSERT(roundedDaysNs == EpochDuration{} ||
              roundedDaysNs == dayLengthNs);
   MOZ_ASSERT(IsValidEpochDuration(roundedDaysNs));

   // Step 19.j. (Inlined AddTimeDurationToEpochNanoseconds)
   epochNanoseconds = startNs + roundedDaysNs;
   MOZ_ASSERT(epochNanoseconds == startNs || epochNanoseconds == endNs);
 } else {
   // Step 20.a.
   auto roundResult = RoundISODateTime(isoDateTime, roundingIncrement,
                                       smallestUnit, roundingMode);

   // Step 20.b.
   int64_t offsetNanoseconds;
   if (!GetOffsetNanosecondsFor(cx, timeZone, thisNs, &offsetNanoseconds)) {
     return false;
   }
   MOZ_ASSERT(std::abs(offsetNanoseconds) < ToNanoseconds(TemporalUnit::Day));

   // Step 20.c.
   if (!InterpretISODateTimeOffset(
           cx, roundResult, OffsetBehaviour::Option, offsetNanoseconds,
           timeZone, TemporalDisambiguation::Compatible,
           TemporalOffset::Prefer, MatchBehaviour::MatchExactly,
           &epochNanoseconds)) {
     return false;
   }
 }
 MOZ_ASSERT(IsValidEpochNanoseconds(epochNanoseconds));

 // Step 21.
 auto* result =
     CreateTemporalZonedDateTime(cx, epochNanoseconds, timeZone, calendar);
 if (!result) {
   return false;
 }

 args.rval().setObject(*result);
 return true;
}

/**
* Temporal.ZonedDateTime.prototype.round ( roundTo )
*/
static bool ZonedDateTime_round(JSContext* cx, unsigned argc, Value* vp) {
 // Steps 1-2.
 CallArgs args = CallArgsFromVp(argc, vp);
 return CallNonGenericMethod<IsZonedDateTime, ZonedDateTime_round>(cx, args);
}

/**
* Temporal.ZonedDateTime.prototype.equals ( other )
*/
static bool ZonedDateTime_equals(JSContext* cx, const CallArgs& args) {
 Rooted<ZonedDateTime> zonedDateTime(
     cx, ZonedDateTime{&args.thisv().toObject().as<ZonedDateTimeObject>()});

 // Step 3.
 Rooted<ZonedDateTime> other(cx);
 if (!ToTemporalZonedDateTime(cx, args.get(0), &other)) {
   return false;
 }

 // Steps 4-6.
 bool equals = zonedDateTime.epochNanoseconds() == other.epochNanoseconds() &&
               TimeZoneEquals(zonedDateTime.timeZone(), other.timeZone()) &&
               CalendarEquals(zonedDateTime.calendar(), other.calendar());

 args.rval().setBoolean(equals);
 return true;
}

/**
* Temporal.ZonedDateTime.prototype.equals ( other )
*/
static bool ZonedDateTime_equals(JSContext* cx, unsigned argc, Value* vp) {
 // Steps 1-2.
 CallArgs args = CallArgsFromVp(argc, vp);
 return CallNonGenericMethod<IsZonedDateTime, ZonedDateTime_equals>(cx, args);
}

/**
* Temporal.ZonedDateTime.prototype.toString ( [ options ] )
*/
static bool ZonedDateTime_toString(JSContext* cx, const CallArgs& args) {
 Rooted<ZonedDateTime> zonedDateTime(
     cx, ZonedDateTime{&args.thisv().toObject().as<ZonedDateTimeObject>()});

 SecondsStringPrecision precision = {Precision::Auto(),
                                     TemporalUnit::Nanosecond, Increment{1}};
 auto roundingMode = TemporalRoundingMode::Trunc;
 auto showCalendar = ShowCalendar::Auto;
 auto showTimeZone = ShowTimeZoneName::Auto;
 auto showOffset = ShowOffset::Auto;
 if (args.hasDefined(0)) {
   // Step 3.
   Rooted<JSObject*> options(
       cx, RequireObjectArg(cx, "options", "toString", args[0]));
   if (!options) {
     return false;
   }

   // Steps 4-5.
   if (!GetTemporalShowCalendarNameOption(cx, options, &showCalendar)) {
     return false;
   }

   // Step 6.
   auto digits = Precision::Auto();
   if (!GetTemporalFractionalSecondDigitsOption(cx, options, &digits)) {
     return false;
   }

   // Step 7.
   if (!GetTemporalShowOffsetOption(cx, options, &showOffset)) {
     return false;
   }

   // Step 8.
   if (!GetRoundingModeOption(cx, options, &roundingMode)) {
     return false;
   }

   // Step 9.
   auto smallestUnit = TemporalUnit::Unset;
   if (!GetTemporalUnitValuedOption(cx, options, TemporalUnitKey::SmallestUnit,
                                    &smallestUnit)) {
     return false;
   }

   // Step 10.
   if (!GetTemporalShowTimeZoneNameOption(cx, options, &showTimeZone)) {
     return false;
   }

   // Step 11.
   if (!ValidateTemporalUnitValue(cx, TemporalUnitKey::SmallestUnit,
                                  smallestUnit, TemporalUnitGroup::Time)) {
     return false;
   }

   // Step 12.
   if (smallestUnit == TemporalUnit::Hour) {
     JS_ReportErrorNumberASCII(cx, GetErrorMessage, nullptr,
                               JSMSG_TEMPORAL_INVALID_UNIT_OPTION, "hour",
                               "smallestUnit");
     return false;
   }

   // Step 13.
   precision = ToSecondsStringPrecision(smallestUnit, digits);
 }

 // Step 14.
 JSString* str = TemporalZonedDateTimeToString(
     cx, zonedDateTime, precision.precision, showCalendar, showTimeZone,
     showOffset, precision.increment, precision.unit, roundingMode);
 if (!str) {
   return false;
 }

 args.rval().setString(str);
 return true;
}

/**
* Temporal.ZonedDateTime.prototype.toString ( [ options ] )
*/
static bool ZonedDateTime_toString(JSContext* cx, unsigned argc, Value* vp) {
 // Steps 1-2.
 CallArgs args = CallArgsFromVp(argc, vp);
 return CallNonGenericMethod<IsZonedDateTime, ZonedDateTime_toString>(cx,
                                                                      args);
}

/**
* Temporal.ZonedDateTime.prototype.toLocaleString ( [ locales [ , options ] ] )
*/
static bool ZonedDateTime_toLocaleString(JSContext* cx, const CallArgs& args) {
 Rooted<ZonedDateTime> zonedDateTime(
     cx, ZonedDateTime{&args.thisv().toObject().as<ZonedDateTimeObject>()});

 // Steps 3-6.
 Rooted<Value> timeZone(cx,
                        StringValue(zonedDateTime.timeZone().identifier()));
 return intl::TemporalObjectToLocaleString(
     cx, args, intl::DateTimeFormatKind::All, timeZone);
}

/**
* Temporal.ZonedDateTime.prototype.toLocaleString ( [ locales [ , options ] ] )
*/
static bool ZonedDateTime_toLocaleString(JSContext* cx, unsigned argc,
                                        Value* vp) {
 // Steps 1-2.
 CallArgs args = CallArgsFromVp(argc, vp);
 return CallNonGenericMethod<IsZonedDateTime, ZonedDateTime_toLocaleString>(
     cx, args);
}

/**
* Temporal.ZonedDateTime.prototype.toJSON ( )
*/
static bool ZonedDateTime_toJSON(JSContext* cx, const CallArgs& args) {
 Rooted<ZonedDateTime> zonedDateTime(
     cx, ZonedDateTime{&args.thisv().toObject().as<ZonedDateTimeObject>()});

 // Step 3.
 JSString* str = TemporalZonedDateTimeToString(
     cx, zonedDateTime, Precision::Auto(), ShowCalendar::Auto,
     ShowTimeZoneName::Auto, ShowOffset::Auto);
 if (!str) {
   return false;
 }

 args.rval().setString(str);
 return true;
}

/**
* Temporal.ZonedDateTime.prototype.toJSON ( )
*/
static bool ZonedDateTime_toJSON(JSContext* cx, unsigned argc, Value* vp) {
 // Steps 1-2.
 CallArgs args = CallArgsFromVp(argc, vp);
 return CallNonGenericMethod<IsZonedDateTime, ZonedDateTime_toJSON>(cx, args);
}

/**
* Temporal.ZonedDateTime.prototype.valueOf ( )
*/
static bool ZonedDateTime_valueOf(JSContext* cx, unsigned argc, Value* vp) {
 JS_ReportErrorNumberASCII(cx, GetErrorMessage, nullptr, JSMSG_CANT_CONVERT_TO,
                           "ZonedDateTime", "primitive type");
 return false;
}

/**
* Temporal.ZonedDateTime.prototype.startOfDay ( )
*/
static bool ZonedDateTime_startOfDay(JSContext* cx, const CallArgs& args) {
 Rooted<ZonedDateTime> zonedDateTime(
     cx, ZonedDateTime{&args.thisv().toObject().as<ZonedDateTimeObject>()});

 // Step 3.
 auto timeZone = zonedDateTime.timeZone();

 // Step 4.
 auto calendar = zonedDateTime.calendar();

 // Step 5.
 ISODateTime dateTime;
 if (!GetISODateTimeFor(cx, timeZone, zonedDateTime.epochNanoseconds(),
                        &dateTime)) {
   return false;
 }

 // Step 6.
 EpochNanoseconds epochNs;
 if (!GetStartOfDay(cx, timeZone, dateTime.date, &epochNs)) {
   return false;
 }

 // Step 7.
 auto* result = CreateTemporalZonedDateTime(cx, epochNs, timeZone, calendar);
 if (!result) {
   return false;
 }

 args.rval().setObject(*result);
 return true;
}

/**
* Temporal.ZonedDateTime.prototype.startOfDay ( )
*/
static bool ZonedDateTime_startOfDay(JSContext* cx, unsigned argc, Value* vp) {
 // Steps 1-2.
 CallArgs args = CallArgsFromVp(argc, vp);
 return CallNonGenericMethod<IsZonedDateTime, ZonedDateTime_startOfDay>(cx,
                                                                        args);
}

/**
* Temporal.ZonedDateTime.prototype.getTimeZoneTransition ( directionParam )
*/
static bool ZonedDateTime_getTimeZoneTransition(JSContext* cx,
                                               const CallArgs& args) {
 Rooted<ZonedDateTime> zonedDateTime(
     cx, ZonedDateTime{&args.thisv().toObject().as<ZonedDateTimeObject>()});

 // Step 3.
 auto timeZone = zonedDateTime.timeZone();

 // Steps 4-7.
 auto direction = Direction::Next;
 if (args.get(0).isString()) {
   // Steps 5 and 7.
   Rooted<JSString*> directionString(cx, args[0].toString());
   if (!GetDirectionOption(cx, directionString, &direction)) {
     return false;
   }
 } else {
   // Steps 4 and 6.
   Rooted<JSObject*> options(cx, RequireObjectArg(cx, "getTimeZoneTransition",
                                                  "direction", args.get(0)));
   if (!options) {
     return false;
   }

   // Step 7.
   if (!GetDirectionOption(cx, options, &direction)) {
     return false;
   }
 }

 // Step 8.
 if (timeZone.isOffset()) {
   args.rval().setNull();
   return true;
 }

 // Steps 9-10.
 mozilla::Maybe<EpochNanoseconds> transition;
 if (direction == Direction::Next) {
   if (!GetNamedTimeZoneNextTransition(
           cx, timeZone, zonedDateTime.epochNanoseconds(), &transition)) {
     return false;
   }
 } else {
   if (!GetNamedTimeZonePreviousTransition(
           cx, timeZone, zonedDateTime.epochNanoseconds(), &transition)) {
     return false;
   }
 }

 // Step 11.
 if (!transition) {
   args.rval().setNull();
   return true;
 }

 // Step 12.
 auto* result = CreateTemporalZonedDateTime(cx, *transition, timeZone,
                                            zonedDateTime.calendar());
 if (!result) {
   return false;
 }

 args.rval().setObject(*result);
 return true;
}

/**
* Temporal.ZonedDateTime.prototype.getTimeZoneTransition ( directionParam )
*/
static bool ZonedDateTime_getTimeZoneTransition(JSContext* cx, unsigned argc,
                                               Value* vp) {
 // Steps 1-2.
 CallArgs args = CallArgsFromVp(argc, vp);
 return CallNonGenericMethod<IsZonedDateTime,
                             ZonedDateTime_getTimeZoneTransition>(cx, args);
}

/**
* Temporal.ZonedDateTime.prototype.toInstant ( )
*/
static bool ZonedDateTime_toInstant(JSContext* cx, const CallArgs& args) {
 auto* zonedDateTime = &args.thisv().toObject().as<ZonedDateTimeObject>();
 auto epochNs = zonedDateTime->epochNanoseconds();

 // Step 3.
 auto* result = CreateTemporalInstant(cx, epochNs);
 if (!result) {
   return false;
 }

 args.rval().setObject(*result);
 return true;
}

/**
* Temporal.ZonedDateTime.prototype.toInstant ( )
*/
static bool ZonedDateTime_toInstant(JSContext* cx, unsigned argc, Value* vp) {
 // Steps 1-2.
 CallArgs args = CallArgsFromVp(argc, vp);
 return CallNonGenericMethod<IsZonedDateTime, ZonedDateTime_toInstant>(cx,
                                                                       args);
}

/**
* Temporal.ZonedDateTime.prototype.toPlainDate ( )
*/
static bool ZonedDateTime_toPlainDate(JSContext* cx, const CallArgs& args) {
 Rooted<ZonedDateTime> zonedDateTime(
     cx, ZonedDateTime{&args.thisv().toObject().as<ZonedDateTimeObject>()});

 // Step 3.
 ISODateTime temporalDateTime;
 if (!GetISODateTimeFor(cx, zonedDateTime.timeZone(),
                        zonedDateTime.epochNanoseconds(), &temporalDateTime)) {
   return false;
 }

 // Step 4.
 auto* result =
     CreateTemporalDate(cx, temporalDateTime.date, zonedDateTime.calendar());
 if (!result) {
   return false;
 }

 args.rval().setObject(*result);
 return true;
}

/**
* Temporal.ZonedDateTime.prototype.toPlainDate ( )
*/
static bool ZonedDateTime_toPlainDate(JSContext* cx, unsigned argc, Value* vp) {
 // Steps 1-2.
 CallArgs args = CallArgsFromVp(argc, vp);
 return CallNonGenericMethod<IsZonedDateTime, ZonedDateTime_toPlainDate>(cx,
                                                                         args);
}

/**
* Temporal.ZonedDateTime.prototype.toPlainTime ( )
*/
static bool ZonedDateTime_toPlainTime(JSContext* cx, const CallArgs& args) {
 Rooted<ZonedDateTime> zonedDateTime(
     cx, ZonedDateTime{&args.thisv().toObject().as<ZonedDateTimeObject>()});

 // Step 3.
 ISODateTime temporalDateTime;
 if (!GetISODateTimeFor(cx, zonedDateTime.timeZone(),
                        zonedDateTime.epochNanoseconds(), &temporalDateTime)) {
   return false;
 }

 // Step 4.
 auto* result = CreateTemporalTime(cx, temporalDateTime.time);
 if (!result) {
   return false;
 }

 args.rval().setObject(*result);
 return true;
}

/**
* Temporal.ZonedDateTime.prototype.toPlainTime ( )
*/
static bool ZonedDateTime_toPlainTime(JSContext* cx, unsigned argc, Value* vp) {
 // Steps 1-2.
 CallArgs args = CallArgsFromVp(argc, vp);
 return CallNonGenericMethod<IsZonedDateTime, ZonedDateTime_toPlainTime>(cx,
                                                                         args);
}

/**
* Temporal.ZonedDateTime.prototype.toPlainDateTime ( )
*/
static bool ZonedDateTime_toPlainDateTime(JSContext* cx, const CallArgs& args) {
 Rooted<ZonedDateTime> zonedDateTime(
     cx, ZonedDateTime{&args.thisv().toObject().as<ZonedDateTimeObject>()});

 // Step 3.
 ISODateTime dateTime;
 if (!GetISODateTimeFor(cx, zonedDateTime.timeZone(),
                        zonedDateTime.epochNanoseconds(), &dateTime)) {
   return false;
 }
 MOZ_ASSERT(ISODateTimeWithinLimits(dateTime));

 // Step 4.
 auto* result = CreateTemporalDateTime(cx, dateTime, zonedDateTime.calendar());
 if (!result) {
   return false;
 }

 args.rval().setObject(*result);
 return true;
}

/**
* Temporal.ZonedDateTime.prototype.toPlainDateTime ( )
*/
static bool ZonedDateTime_toPlainDateTime(JSContext* cx, unsigned argc,
                                         Value* vp) {
 // Steps 1-2.
 CallArgs args = CallArgsFromVp(argc, vp);
 return CallNonGenericMethod<IsZonedDateTime, ZonedDateTime_toPlainDateTime>(
     cx, args);
}

const JSClass ZonedDateTimeObject::class_ = {
   "Temporal.ZonedDateTime",
   JSCLASS_HAS_RESERVED_SLOTS(ZonedDateTimeObject::SLOT_COUNT) |
       JSCLASS_HAS_CACHED_PROTO(JSProto_ZonedDateTime),
   JS_NULL_CLASS_OPS,
   &ZonedDateTimeObject::classSpec_,
};

const JSClass& ZonedDateTimeObject::protoClass_ = PlainObject::class_;

static const JSFunctionSpec ZonedDateTime_methods[] = {
   JS_FN("from", ZonedDateTime_from, 1, 0),
   JS_FN("compare", ZonedDateTime_compare, 2, 0),
   JS_FS_END,
};

static const JSFunctionSpec ZonedDateTime_prototype_methods[] = {
   JS_FN("with", ZonedDateTime_with, 1, 0),
   JS_FN("withPlainTime", ZonedDateTime_withPlainTime, 0, 0),
   JS_FN("withTimeZone", ZonedDateTime_withTimeZone, 1, 0),
   JS_FN("withCalendar", ZonedDateTime_withCalendar, 1, 0),
   JS_FN("add", ZonedDateTime_add, 1, 0),
   JS_FN("subtract", ZonedDateTime_subtract, 1, 0),
   JS_FN("until", ZonedDateTime_until, 1, 0),
   JS_FN("since", ZonedDateTime_since, 1, 0),
   JS_FN("round", ZonedDateTime_round, 1, 0),
   JS_FN("equals", ZonedDateTime_equals, 1, 0),
   JS_FN("toString", ZonedDateTime_toString, 0, 0),
   JS_FN("toLocaleString", ZonedDateTime_toLocaleString, 0, 0),
   JS_FN("toJSON", ZonedDateTime_toJSON, 0, 0),
   JS_FN("valueOf", ZonedDateTime_valueOf, 0, 0),
   JS_FN("startOfDay", ZonedDateTime_startOfDay, 0, 0),
   JS_FN("getTimeZoneTransition", ZonedDateTime_getTimeZoneTransition, 1, 0),
   JS_FN("toInstant", ZonedDateTime_toInstant, 0, 0),
   JS_FN("toPlainDate", ZonedDateTime_toPlainDate, 0, 0),
   JS_FN("toPlainTime", ZonedDateTime_toPlainTime, 0, 0),
   JS_FN("toPlainDateTime", ZonedDateTime_toPlainDateTime, 0, 0),
   JS_FS_END,
};

static const JSPropertySpec ZonedDateTime_prototype_properties[] = {
   JS_PSG("calendarId", ZonedDateTime_calendarId, 0),
   JS_PSG("timeZoneId", ZonedDateTime_timeZoneId, 0),
   JS_PSG("era", ZonedDateTime_era, 0),
   JS_PSG("eraYear", ZonedDateTime_eraYear, 0),
   JS_PSG("year", ZonedDateTime_year, 0),
   JS_PSG("month", ZonedDateTime_month, 0),
   JS_PSG("monthCode", ZonedDateTime_monthCode, 0),
   JS_PSG("day", ZonedDateTime_day, 0),
   JS_PSG("hour", ZonedDateTime_hour, 0),
   JS_PSG("minute", ZonedDateTime_minute, 0),
   JS_PSG("second", ZonedDateTime_second, 0),
   JS_PSG("millisecond", ZonedDateTime_millisecond, 0),
   JS_PSG("microsecond", ZonedDateTime_microsecond, 0),
   JS_PSG("nanosecond", ZonedDateTime_nanosecond, 0),
   JS_PSG("epochMilliseconds", ZonedDateTime_epochMilliseconds, 0),
   JS_PSG("epochNanoseconds", ZonedDateTime_epochNanoseconds, 0),
   JS_PSG("dayOfWeek", ZonedDateTime_dayOfWeek, 0),
   JS_PSG("dayOfYear", ZonedDateTime_dayOfYear, 0),
   JS_PSG("weekOfYear", ZonedDateTime_weekOfYear, 0),
   JS_PSG("yearOfWeek", ZonedDateTime_yearOfWeek, 0),
   JS_PSG("hoursInDay", ZonedDateTime_hoursInDay, 0),
   JS_PSG("daysInWeek", ZonedDateTime_daysInWeek, 0),
   JS_PSG("daysInMonth", ZonedDateTime_daysInMonth, 0),
   JS_PSG("daysInYear", ZonedDateTime_daysInYear, 0),
   JS_PSG("monthsInYear", ZonedDateTime_monthsInYear, 0),
   JS_PSG("inLeapYear", ZonedDateTime_inLeapYear, 0),
   JS_PSG("offsetNanoseconds", ZonedDateTime_offsetNanoseconds, 0),
   JS_PSG("offset", ZonedDateTime_offset, 0),
   JS_STRING_SYM_PS(toStringTag, "Temporal.ZonedDateTime", JSPROP_READONLY),
   JS_PS_END,
};

const ClassSpec ZonedDateTimeObject::classSpec_ = {
   GenericCreateConstructor<ZonedDateTimeConstructor, 2,
                            gc::AllocKind::FUNCTION>,
   GenericCreatePrototype<ZonedDateTimeObject>,
   ZonedDateTime_methods,
   nullptr,
   ZonedDateTime_prototype_methods,
   ZonedDateTime_prototype_properties,
   nullptr,
   ClassSpec::DontDefineConstructor,
};