Everyday Tools
Date Add & Subtract
Add or subtract days, weeks, months or years from any date.
✓ Free
✓ No account
◉ Runs on this device
Everyday Tools
Powering up the tool…
TOOL DATE-CALCULA
What this tool does
About the date add & subtract
Calendar-correct month arithmetic and the weekday of the answer.
How to use it
- Enter the start date.
- Add or subtract, amount, unit.
- Read the result with its weekday.
- For the gap BETWEEN two dates, the Date Difference room next door.
Useful for
- Find the deadline 90 days from signature.
- Compute a review date 6 months out.
- Check which weekday a future date lands on.
Straight answers
Date Add & Subtract FAQ
What is Jan 31 plus one month?
Feb 28 (or 29) — “same day next month” doesn’t exist, so calendar arithmetic clamps to the month’s end. The tool follows that standard convention and says so, because contracts care.
Does this handle time zones?
It deliberately works in dates only — no clock, no zone, no midnight surprises. Whole-day arithmetic is what deadlines usually mean.