How are months and years handled?

Adding months or years shifts the calendar month or year directly. As with calendars generally, the day may roll into the next month when the target month is shorter, for example 31 January plus one month.

Can I count backwards from a date?

Yes — choose "Subtract" to count days, weeks, months or years before the start date, for example to find a deadline that is 30 days earlier.

Is my date uploaded anywhere?

No — every calculation runs entirely in your browser and nothing is ever uploaded.

Add or Subtract Days Calculator

Add or subtract days, weeks, months or years from a date.

Add or subtract days calculator

Add or subtract a number of days, weeks, months or years from any date and instantly see the resulting date and weekday. Useful for deadlines, notice periods, renewal dates and “what date is X days from now” questions.

Everything runs entirely in your browser — nothing is uploaded.