Tracking for the Temporal built-in implementation

• First prototype (First portion of the Temporal implementation #3277)
• Migrate Temporal to independent boa_temporal crate (Migrate Temporal to its own crate. #3461)
• Complete Temporal.Duration (Tracking issue for Temporal Duration object #4070)
• Complete Temporal.PlainDate (Tracking issue for Temporal PlainDate object  #4071)
• Complete Temporal.Instant (Tracking issue for Temporal Instant object #4074)
• Complete Temporal.PlainDateTime (Tracking issue for Temporal PlainDateTime object #4072)
• Complete Temporal.PlainYearMonth (Tracking issue for Temporal YearMonth object #4077)
• Complete Temporal.PlainMonthDay (Tracking issue for Temporal MonthDay object #4076)
• Implement Temporal.PlainTime methods and operations (Tracking issue for Temporal PlainTime object #4073)
• Implement Temporal.TimeZone methods and operations (Removed from the Temporal Proposal Mid 2024)
• Implement Temporal.ZonedDateTime methods and operations (Tracking issue for Temporal ZonedDateTime object #4075)
• Complete Temporal.Now (dependent on Temporal.Instant, Temporal.DateTime and Temporal.ZonedDateTime)

ECMASCript feature
The new Temporal API has been introduced to improve date handling in JavaScript, and we should add it to Boa to be up to date with the current ECMAScript standard. Tests have been added to the official ECMAScript Test Suite (test262), so we need to pass these tests to get full coverage.

The current proposal (Stage 3) specification can be found here: https://tc39.es/proposal-temporal/

In order to implement this new proposal, you can follow the example of other builtin objects, and feel free to ask for help: https://github.com/boa-dev/boa/tree/main/boa/src/builtins

Example code

This code should now work and give the expected result:

// exact time since the Unix epoch on 1 Janary, 1970 UTC
Temporal.now.instant();
Temporal.now.instant().epochSeconds;
Temporal.now.instant().epochMilliseconds;

// current time zone
Temporal.now.timeZone();

// time in current location, e.g.
// 2021-09-18T04:17:48.435068431-04:00[America/New_York]
Temporal.now.zonedDateTimeISO();

// time in another time zone, e.g.
// 2021-09-18T09:17:48.438068435+01:00[Europe/London]
Temporal.now.zonedDateTimeISO('Europe/London');