Date Duration Calculator
Days, weeks and months between two dates — in your browser.
Enter two valid calendar dates.
The Date Duration Calculator tells you exactly how much time lies between two dates — entirely in your browser. Pick a start date and an end date and you get the total number of days, the same span expressed in full weeks plus leftover days, and a calendar-accurate breakdown in years, months and days. Turn on the inclusive option to count both the first and the last day (handy for billing periods, hotel stays or notice periods), or switch on working days to count only Monday to Friday. Unlike ad-heavy calculators that load trackers and reflow the page, this tool runs the math locally with leap-year-correct UTC arithmetic, so the answer is instant, private, and never sent to a server. It handles leap years, month-length differences and reversed dates correctly, and every result is one click to copy.
How it works
- Choose your start date.
- Choose your end date.
- Read the breakdown — total days, weeks, and a years/months/days split, updated instantly.
- Optionally turn on inclusive counting or working-days-only, then copy the result.
FAQ
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