Document implicit UTC vs ZonedDateTime serialization #303 - #390
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cowtowncoder merged 2 commits intoSep 21, 2026
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ObjectMapper default TimeZone is UTC but hasExplicitTimeZone() stays false until setTimeZone is called, so ZonedDateTime keeps its own zone unless WRITE_DATES_WITH_CONTEXT_TIME_ZONE has an explicit timezone.
cowtowncoder
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Sep 21, 2026
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ObjectMapper documents UTC as the default TimeZone, but that value stays implicit until setTimeZone is called. ZonedDateTime therefore keeps its own zone when written as ISO-8601 unless WRITE_DATES_WITH_CONTEXT_TIME_ZONE has an explicit timezone.
I documented that in the datetime README, JavaTimeModule, and InstantSerializerBase. Behavior is unchanged.
Fixes #303