Date difference calculator
Count calendar days between two dates using date-only arithmetic, with an option to include both the start and end dates.
Ready when you are.
Inputs stay in your browser. Results use the displayed formula and are rounded only for display. Counts calendar days, not working days or holidays.
How to use this tool
- Select the start and end dates.
- Choose whether to include both endpoints.
- Calculate to see days and weeks plus remaining days.
Frequently asked questions
Does daylight saving affect the count?
No. Dates are calculated at UTC midnight, so daylight-saving changes do not alter the day count.
What does inclusive mean?
The same start and end date counts as one day when inclusive is checked, otherwise zero.
Are holidays excluded?
No. Every calendar day is counted, including weekends and holidays.