How to use the Date Difference Calculator
- Choose "Days between dates" or "Add / subtract days".
- Pick your dates, or a start date and number of days.
- Tick "Include end date" if both the first and last day should count, as with leave or hotel nights.
- Read days, weeks, months and working days.
Formula used
Working days skip the weekend days you choose. Public holidays are not removed, because they change each year.
Worked examples
| From | To | Days | Working days (Mon–Fri) |
|---|---|---|---|
| 1 Jan 2026 | 31 Dec 2026 | 364 | 260 |
| 1 Mar 2026 | 1 Apr 2026 | 31 | 22 |
| 14 Aug 2026 | 25 Dec 2026 | 133 | 95 |
Frequently asked questions
How many days are there between two dates?
Subtract the earlier date from the later one. The calculator does this exactly, handling leap years and different month lengths.
Should I include the end date?
Include it when counting days of an event or leave (1 to 3 March is 3 days). Leave it out when counting time elapsed (from 1 to 3 March is 2 days).
How many working days are in 2026?
From 1 January to 31 December 2026 there are 261 weekdays (Monday to Friday), before public holidays.
How do I calculate 30 days from today?
Choose "Add / subtract days", keep today's date and enter 30.
Does this account for leap years?
Yes. Dates are calculated with the real calendar, so 29 February is included in leap years.
Our team builds and tests every tool by hand, checks each formula against official sources (IRS, HMRC, the Income Tax Department of India, CBSE, NHS, WHO) and reviews pages whenever rules change. Last reviewed on . Spotted a mistake? Tell us.