Date

[lukewestby]

There seem to be a few issues popping up around Dates including some duplicates of previously closed issues, so lets track them here

• #632 - Browser inconsistencies in parsing with new Date()
• #690 - Sufficiently large numbers crash Date.fromTime
• #755, #739 - Getting timezone offset for Dates
• #481, #810 - toString date results in a string that is not consistently parseable as a Date
• #857 - Construct a Date from year, month, day
• #855 - Date.fromString interacts with browser env
• #851 - Date type is not comparable

Some summarizing of things that Dates need to resolve issues:

• Consistent, crash-free parsing of inputs (ISO strings and Times)
• Support for UTC offset
• Consistent, possibly standard-compliant output from toString

[evancz]

I changed Date.fromString to Date.fromIso8601 which verifies the format and cannot crash.

I also added Date.toIso8601 which always produces a String in the same format.

I believe the issue with browsers adding in time zone information can be resolved if these two functions are moved into Time which does not care about time zones. Then perhaps Date should move out of core, either to elm-lang/date or a community package, until we can do something like this.

[evancz]

I changed Date.fromString to Date.fromIso8601 which verifies the format and cannot crash.

I also added Date.toIso8601 which always produces a String in the same format.

I believe the issue with browsers adding in time zone information can be resolved if these two functions are moved into Time which does not care about time zones. Then perhaps Date should move out of core, either to elm-lang/date or a community package, until we can do something like this.

[evancz]

I think the problems with JS Date are unsolvable, so I made https://github.com/elm-lang/time to do things in a reasonable way. Should not have any of these problems anymore.

[evancz]

I think the problems with JS Date are unsolvable, so I made https://github.com/elm-lang/time to do things in a reasonable way. Should not have any of these problems anymore.