Date Difference Calculator
Calculate the number of days, weeks, and remainder days between two dates. Free and private, right in your browser.
Pick a start date and an end date to instantly see how many days, weeks, or months separate them, useful for tracking deadlines, calculating someone's age, figuring out how long a project ran, or counting down to an event.
How to use it
- Pick your start date
- Pick your end date
- Read the day, week, and month totals instantly
Frequently asked questions
- Does it count the start date, the end date, or both?
- By default it counts full days between the two dates (end minus start). If you need the start day included, add 1 to the result. The tool shows both the raw difference and common variants like inclusive counts.
- Can I calculate a date that's a certain number of days in the future or past?
- Yes. Enter one known date and the number of days to add or subtract, and it works out the resulting calendar date, which is handy for deadlines, due dates, or countdowns.
- Does it handle leap years and different month lengths correctly?
- Yes, it calculates using actual calendar dates, so February 29th and varying month lengths (28–31 days) are all accounted for automatically, no manual counting needed.
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Nothing is uploaded
The file never leaves your device. There is no server to send it to, so there is nothing to leak, log, or subpoena.
- 2
No signup, no limits
No account, no email, no daily cap, no watermark, and no paid tier waiting behind the third file.
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Works offline
Load the page once and it keeps working with the network off, because all the work was always happening locally.