Date Add or Subtract Calculator
Add or subtract days, weeks, months or years from a date.
Enter your values
ⓘ Live results
Results
- Resulting date
- 2026-10-26
- Written out
- Mon, 26 Oct 2026
- Day of the week
- Monday
- Days from start
- 90
Quick answer
Adding days shifts the calendar directly; adding months keeps the day-of-month where the target month is long enough.
How to use the Date Add or Subtract Calculator
- 1Enter the starting date.
- 2Enter how much time to shift.
- 3Choose the unit and direction.
Worked example
Using the values the calculator loads with:
Inputs
- Start date2026-07-28 YYYY-MM-DD
- Amount90
- UnitDays
- DirectionAfter (add)
Results
- Resulting date2026-10-26
- Written outMon, 26 Oct 2026
- Day of the weekMonday
- Days from start90
Frequently asked questions
What is 90 days from today?
Enter today's date with 90 days added — useful for contract notice periods and return windows.
What happens on 31 January plus one month?
It clamps into the next month, giving 2 or 3 March, because February has no 31st.
About this calculator
- Built and reviewed by James Whitfield · How we build and test calculators
- Report an error
Results are estimates for general information. For medical, legal, structural or financial decisions, confirm with a qualified professional.