Dates & durations
Add or Subtract from a Date
Add or subtract days, weeks, months or years. Includes 30, 60, 90 and 100-day shortcuts.
Open tool →Dates & durations
Exact Date Difference Calculator
Break a date interval into calendar years, months and days.
1
Your dates
On this deviceYour dates are remembered here for 30 days. No account needed.
2
Your story in numbers
Every date has a story.
Enter your dates to discover your result and the next dates worth keeping.
Understanding your result
Calendar durations respect month lengths. Day counts include the start and exclude the end unless selected otherwise. Civil-date intervals are not timestamp durations adjusted for daylight saving changes.
See a worked example
Illustrative example, as of September 13, 2026.
- Start date
- 2020-01-31
- End date
- 2026-09-13
6 years, 7 months, 13 days
Are my dates sent to a server?
Calculations run in your browser. Your dates stay on this device unless you choose to include them in a sharing link or image. “Clear my dates” removes them from local storage.