regex/calendar-date
calendarDate: RegExp matching a calendar-annotated PlainDate string in the RFC 9557 form Temporal writes and reads: the ISO 8601 date, then one[u-ca=<id>]calendar annotation.
calendarDate: RegExp matching a calendar-annotated PlainDate string in the RFC 9557 form Temporal writes and reads: the ISO 8601 date, then one [u-ca=<id>] calendar annotation.