Date Difference Calculator
Calculate the difference between two dates in years, months, weeks, days, hours, and business days.
Calculate the difference between two dates in years, months, weeks, days, hours, and business days (Mon-Fri minus US federal holidays). Or use the secondary mode to add or subtract days from a date.
When to use it
- 1Calculating contract durations or notice periods.
- 2Finding business-day deadlines that exclude weekends and holidays.
- 3Adding 30/60/90 days to a date for project scheduling.
How it works
- 1
Two dates
Pick start and end dates. The total in every common unit shows immediately.
- 2
Business days included
We embed the US federal holiday calendar. Toggle 'include end date' to count it or not.
- 3
Secondary mode
Switch to 'add or subtract days' to compute a future or past date from a starting point.
Frequently asked
Are non-US holidays supported?
Not yet. The list is US federal. Fork the tool to add UK bank holidays, ISO-8601 weeks, etc.
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