Date calculator, use it like this
When you select a start and end date, it calculates the number of days between the two dates. You can also check the duration of your trip or event with the option to include a start date.
Example usage
The difference between September 1 and September 10 is 9 days. Including the start date, it is 10 days.
Please note
Calculates as a calendar date to be independent of time zone and daylight saving time. Calculations do not exclude business days or public holidays.
Step-by-step instructions
- Select the start and end dates from the calendar.
- If you need to count the first day as well as the event period, select Include start date.
- When calculating D-Day, set today as the start date and the target date as the end date.
The reason there is a difference of one day
The date difference is the number of days to move from the start date to the end date. Although there is only one day between September 1 and September 2, the visit period including both dates is two days. This tool converts each calendar date to midnight UTC so that Daylight Savings Time's 23-hour and 25-hour days do not affect the calculations.
| Start date | End date | Date difference | Include start date |
|---|---|---|---|
| 2024-02-28 | 2024-03-01 | 2 days | 3 days |
| 2026-09-01 | 2026-09-10 | 9th | 10th |
| 2026-09-10 | 2026-09-01 | −9 days | −10 days |
Frequently Asked Questions
Are Saturdays and public holidays included?
Yes. Counts all calendar days. For purposes of calculating business days or statutory deadlines, you must check the applicable regulations separately.
What happens if I pick the same date?
The normal date difference is 0 days, or 1 day if Include Start Date is turned on.
What is a negative result?
This means that the end date is before the start date. The Include Start Date option also maintains that direction.
Written and operated by: Moyoutil · Content review: 2026-09-30 · Error report