Dates & durations
Exact Date Difference Calculator
Break a date interval into calendar years, months and days.
Open tool →Dates & durations
Time Since a Date Calculator
Count days, weeks and calendar years since an event.
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.
- Event date
- 2020-01-01
6 years, 8 months, 12 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.