Tim Chevalier 079b13f85d Temporal: Add tests for unbalanced date/time separators
Add tests that strings like "2020-0101", "202001-01" in a date context
and "00:0000" and "0000:00" in a time context are rejected.
2025-12-12 10:26:19 +01:00
..
2025-03-12 17:06:01 -07:00
2025-11-25 13:06:50 -08:00