CalcNova tool
Calculate time
How to use the Time
- 1Enter a start time and an end time.
- 2Enable End time is next day for an overnight interval.
- 3Select Calculate duration to see the elapsed hours, minutes, and seconds.
Formula explained
Duration = end time − start time. When overnight is enabled and the end time is earlier than the start time, 24 hours are added before subtracting.
Example calculation
From 9:30 PM to 2:15 AM the next day is 4 hours and 45 minutes.
Frequently asked questions
Can I calculate an overnight shift?
Yes. Enable the next-day option when the end time falls after midnight.
Can a duration be longer than 24 hours?
This calculator compares two clock times over one day. For multi-day spans, use the Date Calculator.
What if the end time is earlier than the start time?
Enable the next-day option to interpret the end time as occurring on the following day.