Add or subtract dates
Move a date by calendar units. Years are applied first, then months, then weeks and days; invalid month-end dates clamp to that month’s final day.
Tuesday, November 2, 1976
Added to Sunday, October 3, 1976.
ISO date1976-11-02
WeekdayTuesday
Absolute day distance30
Month-end clamping happens after years and again after months. For example, subtracting one month from March 31 lands on February 28 or 29.