Add or Subtract Days Calculator
Find the date a number of days, weeks, months or years before or after a given date. Use a negative number to go back.
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Result date
- Result
- Calendar days apart
- Weekday
- Note
- Work
Saved Calculations
Items you add are saved in this browser.
| Name | Calculation | Result | Remove |
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How to Add Days to a Date
Days and weeks are exact: each day is one calendar day. Months and years keep the same day of the month, moving to the month’s last day when that day doesn’t exist.
Result = start date + n days (weeks × 7) (months keep the day of month)
Worked Example
Tips
For deadlines that skip weekends and holidays, use the business days calculator. Leap years have 366 days, so adding 365 days doesn’t always land on the same date next year.