Time Duration Calculator
Calculate the exact duration between two times. Handles overnight time spans and displays results in hours, minutes, and seconds. Numbers never leave your device — every calculation runs locally in your browser.
How to Use the Time Duration Calculator
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Frequently Asked Questions
How do I use it?
Enter a start time and end time in HH:MM format (12-hour or 24-hour). The calculator shows the exact duration in hours, minutes, and seconds.
Does it handle overnight durations?
Yes. If end time is before start time (e.g., 10:00 PM to 6:00 AM), it calculates the overnight span correctly as 8 hours.
Can I use it for flight times or travel?
Yes. Enter departure and arrival times to calculate exact travel duration, accounting for time zone differences if you adjust the times manually.
What precision is the output?
Results are shown in hours, minutes, and seconds. For example, 3 hours 27 minutes 45 seconds (3:27:45).
When using Time Duration Calculator, is my data stored?
No. All calculations run locally in your browser. No time data is transmitted.
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Last updated October 2026