Add or Subtract Dates
Move a calendar date forward or backward by a chosen number of days, weeks, months, or years.
Processing...
0%
Result
Date arithmetic appears in payment terms, trial periods, warranties, subscriptions, travel plans, and recurring schedules. Adding months is not the same as adding a fixed number of days.
Choose a base date, operation, amount, and unit. The result updates immediately and includes the localized weekday plus an unambiguous ISO date.
Month and year operations preserve the day where possible. If the target month is shorter, the calculator uses its final valid day—for example, one month after January 31 becomes the end of February.
The calculation is local and uses pure calendar arithmetic.