Date Difference Calculator
Days, weeks, months between dates, or add/subtract a duration.
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About the Date Difference Calculator
Measure the gap between two dates, or shift a date by a duration. The Toolcenter Date Difference Calculator returns years, months and days, plus totals in weeks, months, days, business days and hours. Switch modes to add or subtract days, weeks, months, years or business days from a starting date.
How to use it
- 1Choose “difference between dates” or “add/subtract”.
- 2Enter the start and end dates, or the amount and unit.
- 3Read the full breakdown or the resulting date.
- 4Note the business-day total where relevant.
Key features
- Years, months and days between dates
- Totals in weeks, months, days and hours
- Business-day counting
- Add or subtract any duration, including business days
- Leap-year accurate
Frequently asked questions
Does it count business days?+
Yes. The difference mode shows a separate business-day total that excludes Saturdays and Sundays.
Can I add 30 business days to a date?+
Yes. Use add/subtract mode, choose the “business days” unit, and it skips weekends when counting.
Are leap years handled?+
Yes. All arithmetic uses real calendar dates.
Is anything sent to a server?+
No. The calculation is entirely local.
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