About the Days Between Dates Calculator
This tool calculates how many days (and weeks and years) fall between two dates. Enter a start and end date and it returns the exact difference — useful for deadlines, age, project planning, billing periods and countdowns. It runs entirely in your browser.
How to use
- Enter your value (a timestamp or a date).
- The converted result appears instantly, in UTC and local time.
- Click Copy to use it.
Common uses
- Counting days to a deadline or event.
- Project and billing-period planning.
- Working out durations and notice periods.
- Countdowns and anniversaries.
Frequently asked questions
Is the timestamp in seconds or milliseconds?
Unix timestamps are in seconds; this tool also shows milliseconds where relevant.
Which time zone is used?
Results are shown in both UTC and your browser's local time zone.