No servers
Inputs remain on your device.
Time Duration Calculator
Calculate elapsed hours and minutes between times, including midnight crossings.
Calculations happen locally; dates and time zones are not transmitted.
How to use the time duration calculator
- 1
Enter the required dates, times or options.
- 2
Select Calculate to run the operation locally.
- 3
Review and copy each format or print the result.
Calendar accuracy in your browser
Explicit rules
Validates ranges, leap years and month changes.
International formats
Uses Intl and IANA to localize results.
Frequently asked questions
Can it cross midnight?
Yes. An end time earlier than the start is interpreted as the following day.
Are my dates sent to a server?
No. Every operation runs in your browser.
Which calendar is used?
It uses the Gregorian calendar and dates from years 1 through 9999.