Date calculator
Plan a study window, check the length of a trip, or count down to an event. Choose two dates and decide whether to count the end date too.
Date calculator
Runs on your deviceElapsed days or dates on the calendar?
From 1 November to 5 November, four days elapse. If you count each date you plan to study—1, 2, 3, 4, and 5 November—you have five calendar dates. The default result shows the elapsed difference. Turning on the inclusive option adds one, so the same date at both ends gives one day instead of zero. Choose the convention that matches your task.
Calendar math without clock changes
This calculator compares calendar dates using UTC day boundaries. It does not read a time of day or apply your local daylight-saving changes. Each day is shown as 24 hours for the optional hours equivalent. That is a mathematical conversion of the day count, not a measurement of actual clock hours between local timestamps. Month lengths and leap years are taken into account.
Use the right counter for a deadline
The result includes weekends and public holidays. It is not a business-day calculator and does not establish the rules for a legal, employment, or administrative deadline. If a task specifies working days or excludes the starting date in a special way, check those instructions. For everyday plans, the weeks-and-days display can help split a long stretch into manageable blocks.
Worked examples
| Start → end | Elapsed days | Including both dates |
|---|---|---|
| 1 Nov 2026 → 5 Nov 2026 | 4 | 5 |
| 28 Feb 2028 → 1 Mar 2028 | 2 | 3 |
Good questions.
Are weekends included?
Yes. Every calendar day is counted. Public holidays are included as well.
Why does the inclusive option add one?
The normal difference measures elapsed days. Counting both the starting calendar date and the ending date adds one to that difference.
Does it handle leap years?
Yes. A leap day is included when 29 February falls within the selected period.
Updated 5 November 2026 · Methods & corrections