OptionaldayDefaults to "numeric".
OptionalfractionalSub-second digits to display, 0-3 (0 = none).
OptionalhourDefaults to "numeric".
Optionalhour1212-hour clock; defaults to true.
OptionalminuteDefaults to "numeric".
OptionalmonthNumeric or name form; defaults to "numeric".
OptionalsecondDefaults to "numeric".
OptionaltimeAn IANA time zone name (e.g. "America/New_York"); defaults to the
browser's local time zone.
OptionalweekdayA name form ("long"/"short"/"narrow"); defaults to
"disabled" (weekday not shown).
OptionalyearDefaults to "2-digit".
A datetime column's
date_formatin itsCustomform: per-partIntl.DateTimeFormatOptionsoverrides, discriminated from theSimplepreset form by the requiredformat: "custom"key. Each part is a [CustomDatetimeFormat] variant valid for thatIntloption;"disabled"omits the part from the formatted output entirely.