tree 18b4fce8afc4633b7b8b2681aa95aa10cbc50ac5
parent 59d0953a318f0219e45f266430d2d4cc94dc27ae
author Victor Chang <vichang@google.com> 1637168213 +0000
committer Victor Chang <vichang@google.com> 1637602525 +0000

Fix DateTimeFormatter when used with IsoChronology

java.time locale data comes from ICU4J on Android.
DateTimeFormatter internally adds locale extension to indicate
the Chronology. For this bug, the locale becomes "de-AT-u-ca-iso8601".
However, ICU4J doesn't work well with ISO 8601 calendar.

Thus, we workaround the issue by using Gregorian calendar instead.
In most cases, ISO 8601 calendar is similiar to Gregorian
calendar, but with small deviation, e.g. ISO Calendar using
Monday as the first day of week for any locales.

Bug: 206566562
Test: atest CtsLibcoreTestCases:libcore.java.time.format.DateTimeFormatterTest
Change-Id: I6c71e52f62ccaac4afa829b7e5b5d4ba63e5ab3c