Date Duration Calculator
Calculate the duration between two dates in years, months and days.
0 years, 11 months, 30 days
364 total days
How to calculate the duration between two dates
Pick a start date and an end date and the calculator returns the exact gap in days, weeks, months and years. It's the simplest way to count down to an event, work out a notice period, measure a project timeline, or find out how long ago something happened.
Where date duration is useful
Use it for contracts and notice periods, leave and holiday planning, billing cycles, pregnancy and project milestones, or settling a "how many days until…" question. Counting accurately by hand is fiddly because months vary in length — this does it instantly in your browser, with nothing sent to a server.
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Frequently Asked Questions
What date duration does it calculate?
It calculates the distance between two dates in years, months, and days, plus the total number of days.
Does date order matter?
No. It always calculates the absolute duration, so the result is the same whichever date you enter first.
What can I use it for?
Counting days to a deadline or event, project timelines, notice periods, contract lengths, and anniversaries.
Is it free and private?
Yes. It is free, needs no sign-up, and runs entirely in your browser with nothing uploaded.