Explicitly use ISO weekfields for weekyear date formats #113787
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thecoop
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thecoop
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Sep 30, 2024
| @@ -97,6 +97,7 @@ Function<String, ZonedDateTime> getFunction(String format, ZoneId zoneId, Locale | |||
| // fill the rest of the date up with the parsed date | |||
| if (accessor.isSupported(ChronoField.YEAR) == false | |||
| && accessor.isSupported(ChronoField.YEAR_OF_ERA) == false | |||
| && accessor.isSupported(WeekFields.ISO.weekBasedYear()) == false | |||
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These additions, and similar, are because ISO.weekBasedYear is a different thing to of(locale).weekBasedYear, even though they probably represent the same thing
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Contrary to what you might think, this is actually maintaining existing behaviour when run on JDK 22 and 23.
IsoCalendarDataProvideroverrides the root locale weekyear to use ISO, which effectively means we are already using ISO for all week-based date formats. Changing to JDK 23 means the locale-based ones use Sunday/1-day for weekfield definitions, so setting this to explicitly ISO is maintaining the existing behaviour. It also makes all week-date formats definitely use ISO definitions.This is aimed at 8.x, as that's where all the docs are targetting. When we're all settled on the various PRs, I'll forward-port this to main, along with any relevant locale docs already merged into 8.x