Date & Time
Date Difference Calculator
Count calendar days, exact span, business days, weekends, and exclusions.
Result
Enter your numbers and press Calculate to see the result.
Calculating…
How the date difference is calculated
Enter any two dates and the calculator breaks the gap down three ways: an exact span in years, months, and days; the total number of days and weeks; and the number of business days (Monday–Friday) with weekend days and custom excluded weekdays shown separately. If the dates are in the wrong order it swaps them automatically.
Method
- Total days — the number of midnights between the two dates.
- Years / months / days — whole calendar years, then whole months, then leftover days, using real month lengths and leap years.
- Business days — every weekday in the range, minus any custom excluded weekdays you enter for holidays or closures.
- Include end date — adds one day, turning an exclusive count into an inclusive one.
Worked example
From January 1, 2026 to December 31, 2026: 364 total days (52 weeks), which is 11 months and 30 days exactly. Of those, 261 are weekdays and 103 fall on weekends before any custom exclusions. Ticking "include end date" makes it a full 365 days — one calendar year.
Common reasons to count between dates
- Deadlines and notice periods — days until a due date, or a 30/60/90-day notice window.
- Contracts and leases — the exact term length, or time remaining before renewal.
- Projects — working days available for a task, excluding weekends and holidays.
- Personal milestones — days since an anniversary, or a countdown to a trip or event.
Getting business days right
The weekday count already removes Saturdays and Sundays. Public holidays differ by country and region, so no universal list applies — subtract known holidays in your range yourself for a true working-day figure. The custom excluded weekdays option removes a whole day of the week (handy if your schedule also skips, say, every Friday). Decide too whether the count should include the end date — a contract "through December 31" is inclusive, while "days until December 31" usually is not.
Counting from a birth date? The age calculator adds a next-birthday countdown. For hours within a single day, use the time duration calculator.
Date Difference Calculator — frequently asked questions
How do I count the days between two dates?
Enter a start and end date and the calculator returns the exact span in years, months, and days, plus the total number of days and weeks between them.
What counts as a business day?
Monday through Friday. The business-days figure excludes Saturdays and Sundays. Use the custom excluded weekdays field when you want to subtract holidays or other weekday closures.
What does "include end date" do?
It adds one day to the count, treating the range as inclusive. Jan 1 to Jan 3 is 2 days exclusive but 3 days inclusive — useful for counting nights vs. days of an event.
Does the order of dates matter?
No. If the end date is earlier than the start date, the calculator swaps them automatically and shows the positive difference.