Tracking Issue: TimeZones DataProviders

[nordzilla]

Tracks progress on issues related to TzdbDataProvider for

• Tracking Issue: TimeZones 1.0 #887

Time Zones information will need to come from two sources.

The first is from CLDR JSON, so the CldrJsonDataProvider will need to have a TimeZonesProvider struct within it.

The second source is from the IANA TZDB. It makes sense to separate this out into its own crate entirely tzdb-provider, that specifies a TzdbDataProvider struct.

• CldrJsonDataProvier
  • Initial implementation of ZonedDateTimeFormat #418
  • Retrieve localized metazone info from timeZoneNames.json in TimeZonesProvider #993
  • Clean up type fallback part-1 in TimeZonesProvider #994
  • Add supplemental CLDR metaZones.json to TimeZonesProvider #995
  • Add supplemental CLDR primaryZones.json to TimeZonesProvider #996
  • Add locale-specific CLDR territories.json to TimeZonesProvider #997
  • Add and use BCP-47 time-zone identifiers in TimeZonesProvider #606
  • Replace metazones with a more compact identifier #528
  • Remove the special case 'Yukon' in TimeZone once CLDR adds its short id. #1781
  • Retrieve Canonical TZIDs #2909
• TzdbDataProvider
  • Create an initial tzdb-provider crate #998
  • Design ICU4X ZoneInfo data structs for TZDB data #999
  • Parse TZif files into ICU4X data formats for TzdbDataProvider #1000
  • Parse IANA files into ICU4X data formats for TzdbDataProvider #1001
  • Parse ICU files into ICU4X data formats #1002

[sffc]

@samchen61661 is interested in working on this.

[nekevss]

Thowing the research / design proposal that I've been working on here.

Disclaimer: There's still a little more work to be done around the TzProvider concept, but it does provide a general overview. Hopefully will be able to update that it's complete soon 😄

CC: @sffc, just for reference regarding the issue the link is posted in.

https://hackmd.io/9viRIokmT--PncH5yAnjiA?view

[nordzilla]

Hey @nekevss,

I just wanted to say that I'm super happy to see you working on this. The WIP write-up looks great at a first glance. Please let me know if there's anything I can do to help with your efforts here.