Date Difference Calculator — Days and Weeks
Calculate whole days and weeks between two UTC calendar dates for planning gaps. Example: 2024-01-01 to 2024-01-11 → 10 days (1 week + 3 days). Browser-only date arithmetic process.
How it works
Enter start and end dates. The tool reports absolute whole days between them and days/7 as weeks.
Formula
Parse UTC YYYY-MM-DD; days = round(|end−start|/86400000); weeks = days/7. Notes:
- Order does not matter for the absolute span.
- Clock time is ignored — calendar dates only.
- Pair with the age tool for Y/M/D breakdowns.
Example
Example: 2024-01-01 to 2024-01-11 → 10 days.
When to use it
- Project duration sketches.
- Homework on day counts.
- Compare with age for calendar age.
Frequently asked questions
Sample?
2024-01-01 → 2024-01-11 = 10 days.
Signed?
We report absolute days.
Timezones?
UTC calendar days.
Advice?
Educational only.
Related tools
Questions or feedback
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