Date Calculator (Add or Subtract)
Date Calculator (Add or Subtract): free, accurate and easy to use. Works in your browser with no sign-up.
How to use
Add or subtract days, weeks, months or years from any date, or count business days that skip weekends. See the resulting date and its weekday instantly. It helps with deadlines, due dates, contracts, notice periods and delivery estimates.
- Enter a date, time or value.
- Results update instantly.
- Copy the result you need.
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Frequently asked questions
What happens when adding a month to the 31st?
If the target month is shorter, the result moves to the last day of that month. For example, January 31 plus one month is February 28, or 29 in a leap year.
Do business days include holidays?
Business days skip Saturdays and Sundays only. Public holidays are not taken into account.
Is it free?
Yes. All tools are free, with no sign-up and no limits.
Is my data stored or sent?
No. Everything runs in your browser. A few tools remember your choices on this device only.
Are the results accurate?
Calculations use your browser’s built-in date and time zone data and standard formulas. For legal or religious dates, confirm with the official authority.