Add or Subtract Days
Add or subtract days, weeks, months or years from a date.
Result
Saturday, February 28, 2026
- ISO date
- 2026-02-28
Show the work
Move the calendar by whole months (a short month keeps its last day)
date + (years × 12 + months) months
Saturday, January 31, 2026 + (0 × 12 + 1) months = Saturday, February 28, 2026
How it works
Months and years move the calendar date (clamped to the month's last day); weeks and days add 7 and 1 days
Questions
- How does the add or subtract days work?
- Months and years move the calendar date (clamped to the month's last day); weeks and days add 7 and 1 days.
- What do I need to enter?
- Start date, Operation, Years, Months, Weeks, Days. Optional fields can be left blank.
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