Add or subtract days from a date
Add or subtract days, weeks, months or years to find a future or past date.
About this add days to date calculator
Need the date 30, 60 or 90 days from today, the end of a 6-month contract, or a date 2 weeks ago? This calculator adds or subtracts days, weeks, months or years from any date and shows the resulting date with its weekday.
When adding months, it keeps the same day of the month where possible. If that day doesn't exist — for example, one month after January 31 — it uses the last day of the month (February 28 or 29) instead of spilling into March.
How to use the Add Days to Date Calculator
- Choose the start date (defaults to today).
- Choose add or subtract.
- Enter the amount and unit.
- Read the result date.
How dates are added
Days and weeks are added on the calendar, so month and year boundaries and leap days are handled automatically. Months and years move the month number and clamp the day to the last valid day of the target month.
Worked example
90 days after October 14, 2026 is Tuesday, January 12, 2027. One month after January 31, 2027 is February 28, 2027.
Tips for better results
- For deadlines that skip weekends and holidays, use the business days calculator.
- Legal deadlines can have special counting rules; check the rule that applies to you.
Frequently asked questions
What date is 90 days from today?
Enter today's date, choose Add, 90 and Days. The result updates automatically.
What happens when adding a month to January 31?
The result is the last day of February, because February 31 doesn't exist.
Last reviewed: October 2026 · Results are calculated in your browser.