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Calculate the exact hours and minutes between any two clock times — including overnight shifts.
08:30, 8:30, 17:15, 8:30 AM, 5:15 PMFrom 8:30 AM to 5:15 PM is 8 hours, 45 minutes (525 minutes).
Time Duration & Clock Interval Calculator. Calculate elapsed time between starting and ending clock times with hours, minutes, seconds, and overnight shift handling. ZechKit provides this tool completely free and online, optimized for instant, accurate computations directly inside your web browser.
A Time Duration Calculator computes the precise elapsed time—in hours, minutes, and seconds—between a start time and an end time.
Overnight Midnight Crossing: When an end time occurs on the following day (such as starting at 10:00 PM and finishing at 6:00 AM), the calculation engine adds 24 hours to the end time to calculate the true overnight duration (8 hours).
Dual Formatting: The tool displays outputs in both standard clock format (HH:MM:SS) and decimal hours (e.g. 7h 30m = 7.50 hours).
Practical Uses: Essential for recording timesheets, tracking flight durations, timing athletic workouts, and measuring machine operating cycles.
Can I calculate time duration using 24-hour military time?
Yes. The calculator supports both 12-hour AM/PM civilian notation and 24-hour military time formats.