Date Difference Calculator
Measure the signed number of calendar days between two dates, with an absolute count and week conversion alongside it.
Runs locally in your browser
Days
364
Weeks
52
Absolute days
364
Dates are compared as calendar dates in UTC, so daylight saving changes do not affect the day count. The end date is excluded.
What is the Date Difference Calculator?
Measure the signed number of calendar days between two dates, with an absolute count and week conversion alongside it.
How to use it
- 1Choose a start date and an end date.
- 2Read the signed day count and absolute difference.
- 3Reverse the dates if you want the opposite direction.
How it works
Both date-only values are normalized to UTC midnight, then their millisecond difference is divided by 86,400,000. This avoids daylight-saving shifts.
One week apart
January 1 to January 8 is seven elapsed calendar days. The end date itself is not counted as an extra day.
Limitations & notes
- This is an elapsed day count, not an inclusive event-day count.
- It does not calculate business days or holidays.
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