Date Difference Calculator
Number of days
... to ...
How to use this calculator?
1. Select the start date
2. Select the end date
3. The number of days is calculated automatically
Quick answer
How do you calculate the number of days between two dates?
Subtract the start date from the end date and count the days elapsed, taking into account the length of each month and leap years. The start day is not counted: add 1 if you want to include both dates. Example: from 1 January to 31 December 2026 there are 364 days, or 365 if you include both dates.
| Start date | End date | Days |
|---|---|---|
| 1 January 2026 | 1 February 2026 | 31 |
| 1 January 2026 | 1 July 2026 | 181 |
| 1 January 2026 | 31 December 2026 | 364 |
| 1 January 2026 | 1 January 2027 | 365 |
| 1 January 2028 | 1 January 2029 | 366 |
About the Days Between Two Dates
What is it?
The days between dates calculator precisely determines the number of days, weeks or months separating two dates, accounting for leap years.
Why use it?
Useful for calculating delivery deadlines, contract durations, trial periods, payment due dates or planning a project with a precise deadline.
How does it work?
Select a start date and end date. The tool automatically calculates the exact number of days between them, as well as the duration in weeks and months.
Usage tips
- Both the start date and end date are included in the calculation
- Leap years (366 days) are automatically accounted for
- For legal deadlines (14-day withdrawal right, 2-year warranty), count from the day after the start date
- Useful for calculating employee seniority or campaign duration
