Add or Subtract Days from a Date

Pick a date and add or subtract a number of days, weeks, months or years. A working-day mode counts only Monday to Friday — handy for notice periods and deadlines.

Start date

Count working days only (skip Sat & Sun)

Adding months keeps the day-of-month where possible (31 Jan + 1 month → 28 Feb / 2 Mar, following JavaScript’s date rules). Working-day mode ignores public holidays.

Related tools

Unix Timestamp ConverterEpoch seconds / milliseconds ⇄ human date, both ways.
Week Number CalculatorISO 8601 week number for today or any date.
Time Duration CalculatorTime between two dates & times, in days, hours and minutes.

Free to use, no sign-up. Calculations run in your browser — nothing you type is sent to a server. These tools are for general information only, not professional advice. See the full tool list.