Adds parseOrdinalDateTimeRange for "November 9th, 05:00 - December 4th,
2023, 04:59 (UTC-5)". Ordinal days anchor the pattern at both ends so it
cannot claim text the looser readers should get, and the year rolls back
across New Year as parseMonthDayRange does.
The offset is required rather than defaulted. parseSlashDateTimeRange has
to read its wall-clock times as UTC because its source states no zone;
here the zone is part of the format, so a cell without one returns null
instead of being silently read five hours early. Calendar validation runs
on the stated local fields, before the shift, or "February 30th, 23:00
(UTC-5)" would convert into a real instant in March.
Co-Authored-By: Claude Opus 5 (1M context) <[email protected]>
