Time & Date Calculator

Four date jobs in one place: the gap between two dates, adding or subtracting time, counting working days, and how long a stretch of clock time lasts — including across midnight.

Date difference Add or subtract Business days Time duration

Start date

End date

All dates are handled in UTC internally. A local-time calculation crossing a daylight-saving change makes a “day” 23 or 25 hours long, which is how date tools end up one day out for half the year.

How to Use the Time & Date Calculator

Choose whether you are measuring a gap or shifting a date.
Enter your dates, or a date and the amount of time to add or subtract.
Read the result in the units you need.

What You Can Do

Count the days, weeks or months between two dates.
Add or subtract days from a date to find a deadline.
Count working days while skipping weekends.
Handles leap years and months of unequal length.

Frequently Asked Questions

How do I count the days between two dates?

Enter both dates and read the difference. Decide whether you want the end date counted, since that changes the total by one.

What counts as a business day?

Monday to Friday. Public holidays vary by country and are not deducted automatically.

How do I find a date 90 days from today?

Enter today, choose to add, and enter 90 days.

Why do months behave differently from days?

Adding one month to 31 January has no exact answer, because February is shorter. Day counts avoid that ambiguity entirely.