About Date Difference Calculator
Calculate the number of calendar days between dates using UTC date arithmetic, so daylight-saving clock changes do not alter the day count.
How to use it
- Choose a start date and an end date.
- Calculate the difference.
- Review the signed and absolute day counts.
Frequently asked questions
Does the count include both dates?
No. The result is the elapsed day difference; add one if you need an inclusive count.
What if the end date is earlier?
The signed result is negative and the absolute count remains positive.