Date range
Measure a date interval.
Choose a start and end date, then decide whether the end date should count in the total.
Business-day results exclude Saturdays and Sundays. Public holidays and company closures are not removed.
Everyday
Date Duration Calculator
Find the number of days between two dates, convert the result to weeks, and count weekdays.
Days between datesWeeksBusiness daysInclusive option
Duration result
Calendar duration
9 days
Jan 1, 2024 → Jan 10, 2024
Weeks and days
1 weeks, 2 days
Business days
7
Counting mode
End excluded
Need a change for Date Duration Calculator?
About this calculator
Method, formulas, and limits.What this does
Counts elapsed calendar days between two dates and provides a weeks-and-days breakdown plus an estimate of weekdays in the range.
Who it is for
Project planners, students, travelers, payroll teams, event organizers, and anyone comparing deadlines or date ranges.
How it works
The default result counts the difference from the start date up to, but not including, the end date. Enabling the inclusive option adds the end date to both calendar and weekday counts.
Limitations
Business-day counts exclude Saturdays and Sundays but do not remove public holidays, company closures, or local working-day exceptions.
Key calculations
- Elapsed days
- days = end date − start date
- Inclusive days
- inclusive days = end date − start date + 1
- Week breakdown
- weeks = floor(days / 7), remaining days = days mod 7
- Business days
- Count weekdays in the selected date interval; weekends are excluded.
Reference ranges
- Exclusive counting
- A range from January 1 to January 10 is 9 elapsed days when the end date is excluded.
- Inclusive counting
- The same range is 10 calendar days when both January 1 and January 10 count.
- Business days
- Weekday counts exclude Saturday and Sunday but do not account for holidays.
How to use it
- 1.Choose the start dateEnter the first date in the range.
- 2.Choose the end dateEnter the final date. The end date must be on or after the start date.
- 3.Select inclusive countingTurn on the option when both endpoint dates should count.
- 4.Compare the outputsUse elapsed days for exact date differences and business days for weekday planning.
Enter the dates and leave inclusive counting off for the standard elapsed difference. The calculator reports the day count and weeks remainder.
Exclusive counting does not count the end date. Inclusive counting adds the end date, which is useful for schedules where both endpoints are work or event days.
No. It excludes Saturdays and Sundays only. Add local holidays and company closures separately for a production schedule.
No. Reverse the dates if you need a positive duration; the calculator flags a reversed range instead of returning a misleading number.
Related calculators
Quick jumps