Add or subtract days from a date

Enter the start date, type the number of days in the quantity field, select "days" as the unit, and the calculator shows the result date immediately.

Yes — enter a negative value in the quantity field (e.g. −14) to subtract 14 days from the start date.

Select "weeks" as the unit and enter the number of weeks. The calculator converts weeks to days (1 week = 7 days) and returns the correct result date.

Select "months" and enter the number of months. The calculator accounts for the actual length of each month, so adding 1 month to 31 January gives 28 or 29 February depending on the year.

Yes. Adding 1 day to 28 February 2024 (a leap year) gives 29 February 2024; in a non-leap year it gives 1 March.

Calculating payment due dates, delivery dates, warranty expiry, notice period end dates, document validity and travel planning.

Enter today's date as the start date, type 30 in the quantity field and select "days". The result date appears immediately.

Enter your start date, type 3 and select "months". The calculator accounts for the exact number of days in each month.

No — the calculator works with dates only (year, month, day) and ignores hours and time zones. The result is always a Gregorian calendar date.

To count elapsed days, use the "days between dates" calculator. This calculator is best suited for finding future or past dates.