Time Duration Calculator
Calculates elapsed time between two clock times, including a shift that crosses midnight.
How it works
Duration between clock times
Formula and assumptions
Duration = end time − start time; when the end time is earlier than the start time, the tool assumes the interval crosses midnight. Use the time-card calculator if you need to subtract breaks.
Example
Use the sample values, calculate, and change one input at a time.
Frequently asked questions
Are results exact? Results depend on the assumptions and inputs above.
Can I use this for professional decisions? Verify critical results independently.
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Frequently asked questions
Does it subtract unpaid breaks?
No. Use the time-card calculator when you need to subtract a break from a shift.
What should I check before relying on the result?
Confirm the input units and assumptions described above; independently verify safety-critical, medical, financial or professional decisions.