time-value-maximum-range.js (1649B)
1 // Copyright (C) 2018 Andrew Paprocki. All rights reserved. 2 // This code is governed by the BSD license found in the LICENSE file. 3 4 /*--- 5 esid: sec-date.parse 6 description: > 7 Date.parse return value is limited to specified time value maximum range 8 info: | 9 Date.parse ( string ) 10 11 parse interprets the resulting String as a date and time; it returns a 12 Number, the UTC time value corresponding to the date and time. 13 14 A Date object contains a Number indicating a particular instant in time to 15 within a millisecond. Such a Number is called a time value. 16 17 The actual range of times supported by ECMAScript Date objects is slightly 18 smaller: exactly -100,000,000 days to 100,000,000 days measured relative to 19 midnight at the beginning of 01 January, 1970 UTC. This gives a range of 20 8,640,000,000,000,000 milliseconds to either side of 01 January, 1970 UTC. 21 ---*/ 22 23 const minDateStr = "-271821-04-20T00:00:00.000Z"; 24 const minDate = new Date(-8640000000000000); 25 26 assert.sameValue(minDate.toISOString(), minDateStr, "minDateStr"); 27 assert.sameValue(Date.parse(minDateStr), minDate.valueOf(), "parse minDateStr"); 28 29 const maxDateStr = "+275760-09-13T00:00:00.000Z"; 30 const maxDate = new Date(8640000000000000); 31 32 assert.sameValue(maxDate.toISOString(), maxDateStr, "maxDateStr"); 33 assert.sameValue(Date.parse(maxDateStr), maxDate.valueOf(), "parse maxDateStr"); 34 35 const belowRange = "-271821-04-19T23:59:59.999Z"; 36 const aboveRange = "+275760-09-13T00:00:00.001Z"; 37 38 assert.sameValue(Date.parse(belowRange), NaN, "parse below minimum time value"); 39 assert.sameValue(Date.parse(aboveRange), NaN, "parse above maximum time value"); 40 41 reportCompare(0, 0);