Date Calculator
Move a date by any mix of years, months, weeks and days. Enter a minus sign to go back in time.
- Free
- Works offline after your first visit
- Saves on this device
- No sign-up
- Updated
How it works
Years and months are added first, keeping the same day of the month where that day exists. Weeks are then turned into days, and all the days are added on top.
Subtracting works the same way, using negative numbers. The total days line counts every day between the start date and the new date.
Worked example
Starting from 2026-11-05, moving 0 years, 3 months, 2 weeks and 10 days lands on 2027-03-01, which is 116 days from the start.
Questions
Can I use just one part?
Yes. Leave the others at zero, and only the parts you fill in change the answer.
Why does a month change look odd near the end of a month?
Months have different lengths, so a start date late in a month can land on a day that is not the same number in the new month.
Does it count leap days?
Yes. The real calendar is used, so a February 29 inside the range is counted.
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