04:28
<justingrant>
What is the context around this request? Did these non-IANA names previously work in Chrome? If so, how did they work? I ask because I don't see "JST" in https://github.com/unicode-org/cldr/blob/main/common/bcp47/timezone.xml which is AFAIK the data source for time zone IDs used by ICU4C. And, aside from naming, where does the time zone rules for each of these non-standard zones come from? Are each of these simply aliases to an IANA zone or do some/all have distinct rules?
04:40
<justingrant>
Oh, I didn't see the link in the test the first time I read it. Now I understand. Are we seeing customer complaints about (the lack of) these zones? Context: https://github.com/tc39/test262/blob/main/test/intl402/DateTimeFormat/timezone-legacy-non-iana.js
04:58
<sffc>
Does Firefox currently pass this test, and Chrome fails? Where does Safari land?
05:10
<justingrant>
Current Safari accepts these legacy zones.