Can start and end be in different timezones?

Yes. You can set independent zones for accurate cross-region comparisons.

What if end is before start?

The tool reports direction and still shows the absolute duration cleanly.

Yes. DST transition behavior is included in date difference calculations.

Calculate exact date/time differences instantly.
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All date-difference calculations are processed in your browser.

From Date and Time

From Time Zone

To Date and Time

To Time Zone

The conversion engine uses timezone rules (including daylight saving transitions) from your browser.

Enter a date/time and choose zones to convert.

Start Date and Time

Start Time Zone

End Date and Time

End Time Zone

Provide both start and end date/time values to calculate.

Example: Measure exact hours between two deadlines in different regions. See full use case.

Common next steps for this workflow: