Date tool
Date Difference Calculator
Count the elapsed calendar days between any two valid dates.
Count days between two dates
The calculator compares UTC calendar dates, giving a stable result across time zones and daylight-saving changes.
How to use it
- Select the start date.
- Select the end date.
- Choose Find difference.
Formula
Days = absolute value of (end UTC date − start UTC date) ÷ 86,400,000
Example
From 28 February to 1 March in a leap year is 2 elapsed days.
Notes and limitations
The result excludes the starting date and reports an absolute difference. It does not count business days, holidays or inclusive date ranges.
Frequently asked questions
Are both dates included?
No. The result is elapsed days between them.
Can the end date come first?
Yes. Date order does not change the absolute result.
Do daylight-saving changes affect it?
No. UTC calendar dates are used.