Subtract days, weeks, months or years from a date.
Subtracting months clamps the day to the target month length in the same way addition does. Working backwards from a deadline is the usual reason to subtract dates. Backdating notice periods and retention cut-offs both depend on this arithmetic, and month-end dates are where it most often surprises people.
Date Subtraction
Subtract months with day clamping, then subtract the remaining days
Subtract months with day clamping, then subtract the remaining days Subtracting months clamps the day to the target month length in the same way addition does. Working backwards from a deadline is the usual reason to subtract dates.
Backdating notice periods and retention cut-offs both depend on this arithmetic, and month-end dates are where it most often surprises people.
This calculator takes 6 inputs: Start date year, Start date month, Start date day, Days to subtract, Months to subtract, Years to subtract. The pre-filled defaults are a realistic starting point — replace them with figures from your own environment for a result you can act on.