Date Difference Calculator — NumGenie

Date difference calculator

Find the exact time between two dates: years, months, days, weekdays/weekends, hours, and minutes.

Date difference

Set a start and end date. Add times if you need precise hours/minutes.

Required
Optional (defaults 00:00)
Required
Optional (defaults 00:00)
Inclusive adds one day

Figures are estimates; for official deadlines use the exact rules of your authority.

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How to use the Date Difference Calculator

  1. Set a Start date and an End date. Times are optional if you only need whole days.
  2. Choose Count mode:
    • Exclusive of end date counts full days between the dates.
    • Inclusive of end date adds one extra day, useful for leave requests and deadlines.
  3. Select Calculate to see the result in years, months, days and the totals in days, hours and minutes.

Examples

  • 1 Jan 2025 to 1 Feb 2025, exclusive → 31 days. Inclusive → 32 days.
  • 15 Mar 2024 10:30 to 18 Mar 2024 09:00, exclusive → shows exact hours and minutes as well as whole days.
  • 29 Feb 2024 to 1 Mar 2025 → leap day is included in the count.

What the result shows

  • Calendar difference as years, months, days (human friendly).
  • Totals as days, hours, minutes for schedules and timesheets.
  • Breakdown of weekdays and weekend days to help with work planning.

Notes

  • Inclusive mode is common for annual leave. Counting 1–3 May inclusive gives 3 days.
  • If you add times, the tool uses local time on your device. If you leave times empty it treats both as 00:00.
  • Public holidays are not removed.

Quick FAQ

Do you count leap years and leap days?

Yes. The calculation includes 29 February when it falls within the range.

What is the difference between exclusive and inclusive?

Exclusive counts the days in between. Inclusive adds one extra day so both the start and end calendar dates are counted.

Can I compare any two dates?

Yes. Pick any start and end dates, with or without times, and the calculator will show the exact difference.