Date calculator
Calculate date differences, weekdays or add and subtract days, weeks, months and years.
Instructions and limits
- Choose date difference or addition/subtraction, then enter dates and an amount.
- Optionally count Monday–Friday only or include both endpoints, then calculate and copy.
Years 0001–9999. Differences include the earlier date and exclude the later by default; B before A gives a negative result. Month/year arithmetic clamps missing days to the end of the month. Weekdays exclude weekends only, without holidays or regional adjustments.
Use cases and example
Find the calendar interval between dates or calculate a date a chosen number of days, weeks, months or years away.
2024-01-31 plus one month gives 2024-02-29. Select both endpoints to count the start and end date inclusively.
Calculates calendar dates rather than exact elapsed seconds in a timezone. Weekday mode excludes weekends only; check applicable rules separately for statutory deadlines.