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Time duration calculator
Calculate elapsed time between two clock readings, with an explicit next-day option.
Text and numbers
Text
Browser only
Your input and output are processed in this browser. They are not uploaded for processing. No account is required.
This tool needs JavaScript. If it does not load, refresh the page and try again.
How to use this tool
- Enter the requested values: Start time (HH:MM or HH:MM:SS); End time (HH:MM or HH:MM:SS); End is on the next day.
- Choose Calculate and review the result.
- Download the text result if useful. Reset restores the initial inputs and clears the result.
Examples
09:15 to 17:45 = 8 hours 30 minutes.
Limitations
Runs entirely in your browser. Numeric calculations use IEEE-754 floating-point arithmetic; displayed values are rounded to 15 significant digits unless stated otherwise.
Clock arithmetic only; timezone and daylight-saving changes are not applied.
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