- Choose Mode — 'Difference' to find days between dates, or 'Add/Subtract' to calculate a future/past date.
- Enter Dates — Pick start and end dates.
- Calculate — See results in days, weeks, months, years, hours, minutes, and business days.
- Copy — Copy results to clipboard.
Date Difference Calculator — Days Between Dates
The Date Difference Calculator finds the exact number of days, weeks, months, years, hours, minutes, and business days between any two dates. It also features an Add/Subtract mode to calculate what date falls a certain number of days in the future or past.
Features
- Multiple Units — Days, weeks, months, years, hours, minutes.
- Business Days — Excludes weekends (Sat/Sun).
- Add/Subtract Mode — Calculate future or past dates.
- Weekday Display — Shows the day of the week for result dates.
- Copy to Clipboard — One-click result copying.
Common Uses
- Project Planning — Calculate deadlines and durations.
- Age Calculation — Find exact age in days.
- Countdowns — Days until events, holidays, or milestones.
- Business — Calculate business days for SLAs and contracts.
- Travel — Trip duration planning.
How It Works
The calculator computes the absolute difference in milliseconds, then converts to days and larger units. Business days are calculated by iterating through each day and excluding weekends. Month/year calculations use average values (365.25 days/year, 30.44 days/month) for consistency.
Privacy
All calculations run in your browser. No data is transmitted.