Syntax
startOfMonth('<timestamp>', '<format>'?)Examples
startOfMonth('2026-10-23T13:30:30Z')'2026-10-01T00:00:00.0000000Z'
startOfMonth
Returns the first day of the timestamp’s month, at midnight.
Returns the first day of the timestamp’s month, at midnight.
startOfMonth('<timestamp>', '<format>'?)startOfMonth('2026-10-23T13:30:30Z')'2026-10-01T00:00:00.0000000Z'