Days Between Dates Calculator
Count the days, weeks, months and years between any two dates in seconds.
Count the days between two dates
Your date span
Breakdown by month
Each month in the span, with its own weekday and weekend split. The rows are built from your two dates.
How to count the days between two dates
This free days between dates calculator counts the days, weeks, months and years between any two dates. It is made for planners, teachers, travellers and anyone checking a deadline, and it shows weekdays, weekend days and the day of the week for each date. There is no sign-up, and everything runs in your browser.
How do you count the days between two dates?
Subtract the earlier date from the later date. The start date counts and the end date does not, which is how calendars measure a span. For example, January 1 to January 31 is 30 days, not 31, because the 31st is the end. This calculator uses that rule, so it matches how planners and booking systems count a date range.
How many weeks are in the days between two dates?
Divide the total days by seven. The whole number is the count of full weeks, and the remainder is the extra days. For example, 30 days is 4 full weeks and 2 extra days, because 4 times 7 is 28 and 2 days remain. The calculator shows both parts, so you can plan weekly schedules and see the leftover days.
How does the calculator count weekdays and weekends?
The calculator walks through every date in the span and checks its day of the week. Monday to Friday count as weekdays, and Saturday and Sunday count as weekend days. The span from January 1 to January 31, 2026 has 22 weekdays and 8 weekend days. That split helps you plan work deadlines, school terms and holiday cover.
What is the difference between calendar months and 30-day months?
A calendar month follows the real calendar, so January has 31 days, April has 30 and February has 28 or 29. A 30-day month is a fixed estimate that treats every month as 30 days. The two methods can differ by several days over a long span, so this calculator uses calendar months and shows the exact days as well.
How are leap years handled?
A leap year adds February 29, so any span that crosses it is one day longer. The Gregorian calendar, introduced in 1582 and now used in most of the world, adds a leap day in years divisible by 4, except century years, unless they divide by 400, according to Britannica. This calculator uses the calendar, so leap days are counted.
Leap years matter most for long spans. A span from January 1, 2024 to January 1, 2025 is 366 days, while the same span a year later is 365 days, because 2024 was a leap year and 2025 was not. The calculator reads the real calendar for every year in the span, so you never have to adjust for February yourself.
What do common date spans look like?
A single week is 7 days with 5 weekdays, two weeks is 14 days with 10 weekdays, and January 2026 from the 1st to the 31st is 30 days with 22 weekdays. Longer spans follow the same pattern, with about 261 weekdays in a common year. The table below shows the exact figures for the spans people check most often.
| Span | Days | Weeks | Weekdays (about) |
|---|---|---|---|
| One week | 7 | 1 week | 5 |
| Two weeks | 14 | 2 weeks | 10 |
| January 2026 (1 to 31) | 30 | 4 weeks, 2 days | 22 |
| Three months | About 90 | 12 weeks, 6 days | About 64 |
| One common year | 365 | 52 weeks, 1 day | About 261 |
| One leap year | 366 | 52 weeks, 2 days | About 262 |
Weekday counts in this table depend on which day of the week the span starts on, so they are approximate except for the January 2026 row, which the calculator works out exactly.
Frequently asked questions
Does the calculator count the start date or the end date?
It counts the start date and stops before the end date. January 1 to January 31 is 30 days, because the 31st is the finish line, not another day in the span.
Can I count backwards, with the end date before the start date?
Yes. If the end date is earlier than the start date, the calculator swaps them and counts the same span. The result is always the size of the gap between the two dates.
How do I count only business days between two dates?
Use our Business Days Calculator. It counts Monday to Friday only and can also exclude US federal holidays.
Does the calculator handle leap years?
Yes. It uses the real Gregorian calendar, so February 29 is counted whenever a span crosses it, and February has 28 days in other years.
Why does my spreadsheet show a different number of days?
Most spreadsheets subtract dates the same way, but some people add 1 to count both endpoints. If your sheet shows one day more, it is counting the end date as well.
How many days are in a month on average?
On average a month has about 30.44 days, which is 365.25 days in a year divided by 12. Real months range from 28 to 31 days, so use the calendar split above for exact work.
Does this calculator store my dates?
No. The calculator runs entirely in your browser. Nothing you type is uploaded, stored or shared.
More tools you may need
Counting working days only? Try the Business Days Calculator. Need a date in the future or the past? Use the Date Calculator to add or subtract days, weeks or months. Working out someone’s age? Try the Age Calculator.
