Certified tool
Add or Subtract Dates
Add or subtract years, months, weeks, and days from a calendar date.
Resulting calendar date
2024-02-29
Thursday, February 29, 2024
Applied in this order: years, then months with end-of-month clamp, then weeks, then days.
Assumptions
- Offsets apply in order: years, months, weeks, then days.
- Month and year addition clamps overflow days to the last valid day of the target month.
- February 29 plus one year in a non-leap year becomes February 28.
- Negative offsets subtract. Results stay on the Gregorian civil calendar.