How to count the days between two dates
- Pick a start and an end date. They default to today and December 31. The Today button resets the start date.
- Include the end date? Unticked, the calculator counts the nights in between, like a hotel booking. Ticked, it counts both days, like vacation days from Monday to Friday.
- Read the result: days, weeks and days, approximate months, years-months-days, workdays (Mon–Fri), weekend days and hours.
Switch to “Add or subtract days” to count forward or back from a date, for example “today plus 90 days” or “10 business days before the deadline”.
Include the end date or not?
| Situation | End date | Example June 1–5 |
|---|---|---|
| Hotel, rental car, vacation rental | not included | 4 nights |
| Vacation days, conference, course | included | 5 days |
| Age, gap between two events | not included | 4 days |
Legal and contractual deadlines often follow their own counting rules, for instance excluding the day of the triggering event or moving a deadline that falls on a weekend. Check the rules that apply to you.
Workdays and public holidays
The calculator counts Monday to Friday as workdays. Public holidays are left out on purpose because they differ by country and region. Subtract the holidays in your period from the workday count.
| Period | Days | Workdays (Mon–Fri) |
|---|---|---|
| 1 week | 7 | 5 |
| 4 weeks | 28 | 20 |
| 1 year | 365 (leap year 366) | 260 to 262 |
Frequently asked questions
How many days are in a year?
365 days, or 366 in a leap year. Leap years are divisible by 4, except century years not divisible by 400. The next leap year is 2028.
How do I find the date 90 days from today?
Switch to “Add or subtract days”, keep today’s date and enter 90. The result shows the date and weekday.
Does daylight saving time affect the result?
No. The calculator counts whole calendar days, so clock changes do not shift the count.
How far can I count?
As far back or ahead as your browser can display the date. When adding, up to 100,000 days are possible.