tor-browser

The Tor Browser
git clone https://git.dasho.dev/tor-browser.git
Log | Files | Refs | README | LICENSE

realm-time-zone.js (2260B)

      1 // |reftest| skip-if(!this.hasOwnProperty('Intl')||!xulRuntime.shell)
      2 
      3 // Don't run in browser because `SpecialPowers.Cu.getJSTestingFunctions()` doesn't
      4 // appear to be able to change time zone in other Realms.
      5 
      6 const nsPerMinute = 60 * 1000 * 1000 * 1000;
      7 
      8 // Default time zone for jstests is PST8PDT.
      9 const defaultTimeZone = "PST8PDT";
     10 
     11 assertEq(["PST", "PDT"].includes(getTimeZone()), true);
     12 
     13 const canonicalDefaultTimeZone = new Intl.DateTimeFormat("en", {
     14  timeZone: defaultTimeZone
     15 }).resolvedOptions().timeZone;
     16 
     17 function test(timeZone) {
     18  // The time zone of the initial global is correct.
     19  assertEq(getRealmTimeZone(), canonicalDefaultTimeZone);
     20 
     21  // Create a new global with a different time zone.
     22  var g = newGlobal({timeZone});
     23 
     24  var initialTimeZone = timeZone ?? canonicalDefaultTimeZone;
     25 
     26  // Ensure the new global has the expected time zone.
     27  assertEq(g.getRealmTimeZone(), initialTimeZone);
     28 
     29  // Create a Date object in the new global.
     30  var d = new g.Date();
     31 
     32  // Call getTimeZoneOffset to fill the local date-time slots in |d|.
     33  assertEq(
     34    d.getTimezoneOffset() * nsPerMinute,
     35    -d.toTemporalInstant().toZonedDateTimeISO(initialTimeZone).offsetNanoseconds + 0
     36  );
     37 
     38  // Change the time zone of the new global.
     39  g.setRealmTimeZone("Asia/Tokyo");
     40 
     41  // Ensure the new global has the expected time zone.
     42  assertEq(g.getRealmTimeZone(), "Asia/Tokyo");
     43 
     44  // The time zone of the initial global hasn't changed.
     45  assertEq(getRealmTimeZone(), canonicalDefaultTimeZone);
     46 
     47  // Ensure the local date-time slots in |d| don't return stale values.
     48  assertEq(
     49    d.getTimezoneOffset() * nsPerMinute,
     50    -d.toTemporalInstant().toZonedDateTimeISO("Asia/Tokyo").offsetNanoseconds + 0
     51  );
     52 
     53  // Change the time zone of the new global to use the default time zone.
     54  g.setRealmTimeZone(undefined);
     55 
     56  // Ensure the new global has the expected time zone.
     57  assertEq(g.getRealmTimeZone(), canonicalDefaultTimeZone);
     58 
     59  // Ensure the local date-time slots in |d| don't return stale values.
     60  assertEq(
     61    d.getTimezoneOffset() * nsPerMinute,
     62    -d.toTemporalInstant().toZonedDateTimeISO(defaultTimeZone).offsetNanoseconds + 0
     63  );
     64 }
     65 
     66 test();
     67 test("Europe/London");
     68 
     69 if (typeof reportCompare === "function")
     70  reportCompare(true, true);