Who this helps
- People planning a date range
- Teams comparing calendar days with Monday–Friday days
Date Utility
Date Difference Calculator
Calculate the difference between two dates in days, weeks, months, and years. Useful for anniversaries, project schedules, contract periods, study plans, and work duration checks.
Date Difference
Calculate the total period between two dates.
Multiple Units
Check days, weeks, months, and years.
Share and Save
Save recent results and copy share links.
Date Difference Calculator
Enter a start date and an end date to calculate the period between them.
Calculation Options
Total Days
-Total Weeks
-Months
-Years
-Recent Calculation History
Review recently calculated date difference results.
No saved calculation history yet.
Count calendar days or weekdays between two dates
Compare a study period, trip or project window using total days, weeks and completed months. The end-date and weekend options change the day count; the month count is calculated separately from the two dates.
When to use this tool
- Check how many days a trip spans.
- Count weekdays in a work schedule before accounting for holidays.
From input to a checked result
- 1
Select the start and end dates.
- 2
Choose whether to include the later endpoint.
- 3
Enable weekend exclusion for Monday–Friday counting.
- 4
Calculate, then check the dates, options and direction beside the result.
Ten days between dates
- Input
- 2026-08-06 → 2026-08-16 End date excluded; all days
- Result
- 10 days · 1.4 weeks · 0 completed months
The weeks figure is 10 ÷ 7, rounded to one decimal place.
A full calendar week without weekends
- Input
- 2026-08-03 → 2026-08-09 End date included; weekends excluded
- Result
- 5 weekdays
Monday through Friday count. Saturday and Sunday do not; public holidays are not removed.
How it works
Calendar-day mode subtracts the two local-midnight timestamps and rounds to whole days. Including the later endpoint adds one day. Weekday mode walks from the earlier date to the later date and counts Monday–Friday, optionally including the later endpoint. Swapping the dates preserves the count and changes the direction. Completed months count year/month differences, subtracting one if the later day-of-month is smaller; years are months ÷ 12.
Limitations
- Weekend exclusion does not know your country’s holidays or custom working days.
- The weeks figure always divides the selected day count by seven, including when counting weekdays.
- Month and year results ignore the endpoint and weekend options. January 31 to February 28 is zero completed months by this rule.
- Dates do not include a time of day or a selectable time zone.
Your data
Calculations run in your browser. Up to 10 recent calculations are stored in localStorage. Clear history to remove them. Share links include the two dates and options in the URL; opening a shared link sends that URL to the site, where it may appear in access logs.
References
Related tools
- D-Day Calculator
Show days remaining until an event.
- Age Calculator
Compare a birthday with a reference date.
Frequently asked questions
Does the same date count as zero or one day?
Without end-date inclusion it is zero. With inclusion it is one, unless weekend exclusion removes that day.
Does excluding weekends calculate official business days?
It counts Monday–Friday only. Public holidays and regional work schedules are not included.
Why can the result show zero days but a later date?
Two different weekend dates can contain no counted weekdays. The direction label compares the actual dates, independently of the day count.