Calculators tool
Calculate the Difference Between Dates
Find calendar duration and total days between two dates.
Inputs
Results
Simple steps
How it works
- 01
Choose a start date and end date.
- 02
Submit the dates to calculate the interval.
- 03
Review calendar duration and total days.
Good to know
Frequently asked questions
Is the end date included in total days?
Total days measures elapsed midnight-to-midnight intervals; it does not add one for an inclusive range.
Are leap days included?
Yes. The elapsed-day total uses UTC calendar dates and includes leap days.
Can I enter the later date first?
The calculator requires a start date on or before the end date.
How are months calculated?
Calendar months use year/month/day components rather than an assumed fixed number of days.
Is date data uploaded?
No. Date arithmetic is performed locally in your browser.