Date Rollover Calculator

Free date rollover calculator. Find what date results from adding or subtracting days across month and year boundaries.

Calculate what date you get when adding or subtracting days from any starting date, correctly handling month and year rollovers. Useful for deadline calculations and future date planning.

Common use cases

  • Deadline calculations from today
  • Payment due date calculations
  • Shipping/delivery date estimates
  • Future event planning
  • Countdown target dates

How to use

  1. Enter your starting date
  2. Enter days to add or subtract
  3. View the resulting date
  4. See month/year changes automatically handled
  5. Calculate multiple scenarios

FAQ

How are month ends handled?

Adding 30 days from January 15 correctly rolls over to February 14, handling varying month lengths.

What about leap years?

February 29 is correctly included or excluded based on whether the target year is a leap year.

Can I subtract days?

Yes, enter negative numbers to calculate past dates.