Time Duration Calculator
Calculate the duration between two clock times, including overnight spans.
Time Duration Calculator
Calculate the duration between two clock times, including overnight spans.
How to use the Time Duration Calculator
- Enter the start time.
- Enter the end time.
- Click Calculate.
Formula
Duration = End time − Start time
If end < start, add 24 hours (overnight span).
Example
From 10:30 PM to 06:45 AM: Duration = 8h 15m (overnight span).
Step-by-step calculation
- Start: 10:30 PM = 22:30. End: 06:45 AM = 06:45.
- Since end < start, add 24 hours: 06:45 + 24:00 = 30:45.
- Difference: 30:45 − 22:30 = 8:15.
Real-world uses
- Tracking work shifts.
- Calculating overnight travel duration.
- Sleep tracking.
Common mistakes
- Assuming the end time must be later than the start time on the same day.
- Not converting 12-hour times to 24-hour format correctly.
- Confusing AM/PM.
Frequently asked questions
Does this handle overnight spans?
Yes. If the end time is earlier than the start time, it assumes the end time is the next day.
What if the duration is exactly 24 hours?
That is a full 24-hour cycle, e.g., from 3:00 PM to 3:00 PM the next day.
Can I enter times in 12-hour format?
The calculator uses 24-hour format (00:00 to 23:59). Convert 10:30 PM to 22:30.