Date & Business Days Calculator
Calculate the exact number of calendar days, business days, and weekend days between two dates. All math is done in pure UTC, so the result is never skewed by time zones or daylight saving time.
Select two dates and click "Calculate" to see the result.
How to Use
- Pick a start date and an end date using the date inputs.
- Optionally check "Include end date (+1 day)" to count the end date itself.
- Click "Calculate" to see total days, business days (Mon–Fri), and weekend days.
Frequently Asked Questions
Are public holidays counted as business days?
No. Business days are counted as Monday through Friday only. National public holidays vary by country and are not considered in this version.
How does the calculator handle time zones and DST?
Dates are converted to UTC calendar days before any math is done, so daylight saving time transitions and your local time zone can never shift the result by a day.
What happens if the end date is before the start date?
The calculator will show a clear error message instead of a negative or invalid result.