How to use Add or Subtract Days from a Date
- Pick the start date. It is set to today by default.
- Choose Add or Subtract, type the amount and choose the unit.
- Read the result date and weekday.
About this tool
Days and weeks are added exactly. Months and years are added as calendar units: 15 January plus 1 month is 15 February. If the target month is shorter, the last day of that month is used, so 31 January plus 1 month is the last day of February.
Typical uses are deadlines, due dates, warranty and return periods, and finding a date a number of days ago. Calculations are done in whole days and are not affected by daylight-saving changes.
Privacy: This tool runs in your browser. What you type or choose is not sent to a server by this website.
Common questions
What date is 90 days from today?
Leave the start date as today, choose Add, type 90 and choose Days.
Does it count the start day?
No. Adding 1 day to Monday gives Tuesday.