Add or Subtract Days Calculator
Add or subtract a number of calendar days or weekdays from a chosen starting date.
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Add or Subtract Days
Move forward or backward by calendar days or business days.
Start Your Calculation
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Calculation Result
CalculatedHow to use the Add or Subtract Days Calculator
- Choose your starting date.
- Enter a positive number to add days or a negative number to subtract.
- Choose all calendar days or weekdays (Monday to Friday), then calculate.
How does this calculator work?
Calendar-day mode moves by whole Gregorian dates, avoiding daylight-saving effects on the day count. Weekdays mode skips Saturdays and Sundays while moving one calendar date at a time. The starting day is not counted. Country-specific public holidays are not excluded; this is not a public-holiday-aware business-day calculator.
Calculation example
March 1, 2024 minus 1 calendar day is February 29, 2024. Adding 1 weekday to Friday, March 1, 2024 reaches Monday, March 4.
Frequently asked questions
Can I subtract dates as well as add?
Yes. Use a negative number such as −7 to go seven counted days backwards.
Do business days exclude bank holidays?
No. This weekday option excludes weekends only; holidays require a local holiday calendar.
Is the starting date counted?
No. An offset of 1 starts from the next eligible date.
Does it handle leap years?
Yes. It uses Gregorian calendar dates, including February 29 when valid.
What happens if I enter zero?
Zero days returns your starting date.