General
Days Between Dates Calculator
Counts days between dates, where inclusive and exclusive differ by one.
Result
Working days exclude Saturdays and Sundays but not public holidays, which vary by country and state. Subtract those separately when planning a job schedule.
Get a Free Business AuditHow the calculation works
The difference between two dates in days, with the choice of whether both endpoints are counted. Exclusive counting gives the elapsed days between them; inclusive counting adds one and gives the number of days in the span, and which is correct depends entirely on the question.
What moves the number
- Whether the count is inclusive or exclusive.
- Leap years within the period.
- Whether weekends or holidays should be excluded.
- Time zones, where the dates originate in different ones.
Where this one goes wrong
A hire period, a notice period and a hotel stay are all counted differently, which means the off-by-one question is substantive rather than pedantic and the convention has to come from the context rather than the arithmetic. Establish which is meant. Business day counting is a separate question again, since excluding weekends and holidays depends on which holidays apply where, and that is jurisdictional rather than calendrical.
Before you quote
- Establish whether the count should be inclusive or exclusive.
- Specify which holidays apply for a business day count.
- Watch time zones where dates come from different sources.
Questions
About this calculator
Should both dates be counted?
It depends on the question. Exclusive counting gives elapsed days; inclusive counting gives the number of days in the span. A hire period, a notice period and a hotel stay are each counted differently, so the context decides.
How are business days counted?
By excluding weekends and the holidays that apply, which is a jurisdictional question rather than a calendrical one. Holidays differ by country, state and sometimes industry, so a business day count needs its holiday list stated.
Do leap years affect the count?
They affect how a day count converts to years or months, not the day count itself. A period spanning a leap day contains one more day than the same calendar span in a non-leap year, which matters in interest and notice calculations.
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How to use this calculator
- Start date. Enter your own figure; the page starts at 2026-09-08.
- End date. Enter your own figure; the page starts at 2026-12-25.
The result updates as you type, so you can try a figure, see what it does to days between, and change it back. Nothing you enter is sent anywhere or saved.
A worked example
These are the figures the calculator opens with. Every number in the results column below is produced by the same calculation the page runs, so you can follow it through before putting your own figures in.
What goes in
| Input | Value |
|---|---|
| Start date | 2026-09-08 |
| End date | 2026-12-25 |
What comes out
| Result | Value |
|---|---|
| Days between main result | 108 |
| Working days (Mon–Fri) | 78 |
| Weeks | 15.4 |
| Months (approx.) | 3.5 |
There are 108 days between those dates, about 15.4 weeks, or 78 working days.
What each figure means
- Start date
- A number, starting at 2026-09-08.
- End date
- A number, starting at 2026-12-25.
What the results tell you
| Result | What it is |
|---|---|
| Days between | The headline result. A number. |
| Working days (Mon–Fri) | A number. |
| Weeks | A decimal figure. |
| Months (approx.) | A decimal figure. |
Keep going
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