Date Difference Calculator Free Online
Calculate the difference between two dates in days, weeks, months, years, hours, and minutes. Includes business-day count (Mon-Fri) and detailed breakdown.
Results
Pro — bulk batch calculation, API access, history & favorites
API access · Priority queue · Team workspace
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Date Difference Calculator Features
Multiple Units
Total days, weeks (decimal), years/months/days breakdown — pick the format that works for your context.
Business Days
Excludes weekends (Sat/Sun). Useful for project deadlines, contract terms, and SLA calculations. Holidays not excluded.
Either Direction
Future or past dates work. Negative results indicate going backward in time.
Live Calculation
Pick dates, results compute instantly.
Detailed Breakdown
See the calendar-correct year/month/day breakdown — accounts for varying month lengths and leap years.
100% Private
All math runs in your browser.
Free vs Pro
| Feature | Free | Pro |
|---|---|---|
| Full date difference calculation | ||
| Live calculation | ||
| All-units result panel | ||
| Bulk batch calculation | — | |
| REST API access | — | |
| Save & share calculations | — |
Frequently Asked Questions
Counts Monday through Friday only. Excludes weekends (Saturday, Sunday). Does not exclude holidays — those vary by country and would need to be subtracted manually.
Yes. February to March is 1 month even though it could be 28-31 days. Handles leap years and varying month lengths correctly.
Leap years have 366 days. Feb 29, 2024 to Feb 28, 2025 = 365 days = ~1 year. Mar 1, 2024 to Mar 1, 2025 = 365 days = exactly 1 year. The Y/M/D calculator handles this automatically.
This tool calculates inclusive end, exclusive start (the standard "elapsed days" definition). For inclusive both, add 1 to the day count.
Set "From date" to today and "To date" to your target. Days result is your countdown. Useful for project deadlines, vacation planning, etc.