How to calculate days between dates
The calculator compares the start date and end date at midnight local time, then returns the number of calendar days between them. You can choose whether the end date should be included in the total.
Free date tool
Date Difference Calculator
Calculate calendar days, business days, weeks, months, and years between two dates.
- Calendar days
- Business days
- Optional end date
Estimated result
Date span
Days between dates
0
- Business days
- 0
- Weeks
- 0
- Approx. months
- 0
- Approx. years
- 0
What counts as a business day?
Business days usually mean weekdays, Monday through Friday. This calculator excludes weekends when the business-days option is enabled, but it does not remove federal, state, bank, school, or company holidays.
Common uses for a date difference calculator
Date difference tools are useful for deadlines, project schedules, invoices, trip planning, age milestones, event countdowns, and checking how many workdays are available before a target date.