Recognize a date-time from free-form text, or null. Peels a trailing time
token that follows whitespace (06/15/2026 14:30, June 15 2026 2:30pm),
parsing the rest as the date via parseDateInput; with no time token the
time defaults to midnight. min / max bound the date (day-level).
Recognize a date-time from free-form text, or
null. Peels a trailing time token that follows whitespace (06/15/2026 14:30,June 15 2026 2:30pm), parsing the rest as the date via parseDateInput; with no time token the time defaults to midnight.min/maxbound the date (day-level).