How to Calculate the Number of Days Between Two Dates
Published September 22, 2026 · 2 min read
Whether you're planning a project timeline, counting down to an event, or need to know how many working days fall in a date range, this calculates the exact span between any two dates, including a business-day count.
Try Date Difference CalculatorSteps
- 1
Open the Date Difference Calculator tool
Go to the date difference calculator.
- 2
Enter a start date
Type the earlier date.
- 3
Enter an end date
Type the later date.
- 4
Read the results
See the total days, weeks, business days (Monday–Friday), and approximate full years between the two dates.
Frequently asked questions
Monday through Friday are counted as business days; the calculation doesn't account for public holidays, since those vary by country and calendar.
No — the tool automatically works out which date is earlier, so you can enter them in either order and get the same correct result.
For calculating a birth-date-based age specifically, the Age Calculator gives a more natural years/months/days breakdown; this tool is more general-purpose for any two arbitrary dates.
Because the calendar math is handled correctly, this avoids manually counting days on a calendar or miscounting across month boundaries.