Date Difference Calculator
Calculate days, weeks, months and years between two dates.
Pick a start and end date and get the exact difference in days, weeks, months and years. Optionally exclude weekends to count business days.
Common use cases
- Compute project duration in days, weeks or business days
- Calculate the number of days until a deadline, launch or birthday
- Verify SLA windows by counting business days between two dates
- Track elapsed time on long-running tasks and contracts
Frequently asked questions
Are end-date inclusive or exclusive?▾
By convention we count whole days between the two dates (exclusive of the end). Toggle inclusive if you want to include both endpoints.
Does business-day mode account for holidays?▾
It excludes Saturdays and Sundays only. Public holidays vary by country, so the tool doesn't apply a fixed list — adjust the count manually for known holidays.
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