Date Calculator

It adds or subtracts a number of days, weeks, months or years from a starting date and shows you the resulting calendar date.

Choose a start date, enter the number of days to add, and the tool returns the new date, rolling over month and year boundaries automatically.

Yes. You can subtract days, weeks, months or years to find an earlier date, such as a deadline that is 90 days before an event.

Adding months lands on the same day number where possible, and when the target month is shorter the result is adjusted to a valid date.

Yes. Because it uses real calendar dates, adding a year to February 29 and other leap year cases are handled correctly.

It is useful for finding due dates, contract end dates, return by dates, or any deadline measured from a known starting point.

No. The date arithmetic is done in your browser and nothing you enter is uploaded.