Time Duration Calculator
Calculate the exact duration between two times or date-times.
How long was that meeting? How many hours did the shift run? What's the elapsed time between two log entries? Subtracting one time from another sounds trivial until it crosses midnight, spans multiple days, or you need the answer in both "2h 45m" and "165 minutes" forms.
Enter a start and end date-time and this calculator returns the precise duration between them: total days, hours and minutes, plus the totals expressed purely in hours and in minutes. It handles overnight spans and multi-day gaps automatically.
How to use Time Duration Calculator
- 1
Enter the start date-time
The beginning of the interval.
- 2
Enter the end date-time
The end — later or, if reversed, the tool still returns the gap.
- 3
Read the duration
As days/hours/minutes and as total hours and minutes.
Features
- Handles overnight and multi-day spans
- Duration as d/h/m and as total hours/minutes
- Works with any date-time pair
Frequently asked questions
Common mistakes to avoid
- Entering only times without dates for overnight spans — use the full date-time fields so midnight is handled.
- Confusing 12-hour and 24-hour input; the picker uses your browser's locale format.
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