Const
A calendar date YYYY-MM-DD (surrounding whitespace allowed) that exists: an impossible date such as 2026-02-30 or 2026-13-40 is rejected rather than rolled over or compared as an Invalid Date. Years 0000-9999 are accepted.
YYYY-MM-DD
2026-02-30
2026-13-40
A calendar date
YYYY-MM-DD(surrounding whitespace allowed) that exists: an impossible date such as2026-02-30or2026-13-40is rejected rather than rolled over or compared as an Invalid Date. Years 0000-9999 are accepted.