About date differences
This calculator measures the gap between two dates — the exact years, months and days, plus the total days, weeks, weekdays (business days) and more. It is handy for deadlines, contracts, leave, ages and anniversaries. It runs in your browser; nothing is uploaded.
How Date Difference works
How it works
It counts calendar years, then months, then days between the two dates, borrowing from the previous month where needed. Total days is the raw span; weekdays counts only Monday to Friday. Tick "include the end day" to count both endpoints — useful for hotel nights or booked leave.
Worked example
From January 1, 2025 to March 15, 2025: that is 2 months and 14 days, which is 73 days total, or 10 weeks and 3 days. Of those, 53 are weekdays.
Common uses
- Count days between two dates
- Find weeks or months between dates
- Count business days (weekdays)
- Measure a contract or project length
- Work out notice or leave periods
- Count down to a deadline
- Find an anniversary span
- Check days until an event
Frequently asked questions
How many days are between two dates?
Enter both dates and the tool shows the total days, plus weeks and a years/months/days breakdown.
Does it count business days?
Yes — it shows weekdays (Monday to Friday) separately from total days.
What does "include the end day" do?
It counts both the start and end dates, adding one day — useful for booked nights or leave.
What if I enter the dates in the wrong order?
It still works — the smaller date is treated as the start.
Is my data uploaded?
No — it is all calculated in your browser.
Is it free?
Yes, completely free.