Changelog #

Unreleased #

Remove the unused deprecated locale initialization hook. Locale data continues to load lazily; Flutter adapters reference the core directly.
Export locale resolution helpers through the public core library so Material adapters do not import core implementation files.
Validate strict/loose era labels against the resolved year's sign, preserving ambiguous labels and signed-year round trips, including year zero.
Resolve two-digit years across chronology bounds and negative centuries; compare wall-field window endpoints and keep repeated-year range failures within the documented FormatException/nullable parsing contracts.
Reject local DST normalization that changes minutes, seconds, or fractional seconds during strict/loose parsing; preserve permissive parsing and the date-only one-hour midnight exception.
Remove Gregorian formatting/parsing from GeneralDateFormat; applications use intl.DateFormat directly and choose their own locale initialization.
Bundle Persian/Hijri neutral locale metadata and remove intl and clock from the Dart core. The Flutter adapter also has no direct intl dependency.
Add a per-formatter native now callback for two-digit year parsing.
Default pre-operation dateSymbols to Persian; reject native DateTime selectors with UnsupportedError, including nullable parsing APIs.

Extract the corrected pure Dart implementation from the Flutter package.
Preserve exact microseconds in six-digit fraction formatting/parsing, including localized digits, and reject excess nonzero precision in strict/loose parsing.
Generate Persian and Umm al-Qura names from checksum-locked CLDR 48 sources, preserving documented locale and shared-pattern compatibility policies.