Days Between Dates Calculator
Calculate the exact number of calendar days between two dates. Enter a start date and an end date, and the result updates automatically.
How to Use
Select the start date and the end date. The calculator immediately displays the number of calendar days between them.
The order of the dates does not matter. The calculator always returns a positive difference.
The calculation uses the standard difference between dates. For example, July 1 to July 2 is 1 day, and two identical dates are 0 days.
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Days Between Dates Calculator
Calculate the exact number of calendar days between two dates. Enter a start date and an end date, and the result updates automatically.
Examples
- January 1 to January 2 = 1 day
- January 1 to January 3 = 2 days
- January 1 to January 1 = 0 days
- December 31 to January 1 = 1 day
- The order does not matter. January 3 to January 1 also equals 2 days.
Frequently Asked Questions
Why is January 1 to January 2 only one day?
The calculator measures the time separating the two dates. Only one calendar-day boundary is crossed between January 1 and January 2, so the difference is 1 day.
Why is January 1 to January 3 two days instead of three?
January 1 to January 2 is the first day, and January 2 to January 3 is the second day. The starting date is not counted as an additional full day.
Does the calculator include both the start date and the end date?
No. It calculates the standard elapsed difference between the dates. It does not use inclusive counting.
What happens if I enter the later date first?
The order does not matter. The calculator uses the absolute difference, so January 3 to January 1 gives the same 2-day result as January 1 to January 3.
What happens if both dates are the same?
The result is 0 days because no calendar days separate the two dates.
Are leap years handled correctly?
Yes. Because the calculator uses actual calendar dates, February 29 is included automatically in leap years.
Can daylight-saving time change the result?
No. The calculation compares normalized UTC calendar dates, so daylight-saving time and local-time changes do not affect the number of days.
Credits
Days Between Dates Calculator
Version: 0.1