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About the Time Duration Calculator
This calculator measures the exact duration between two times or two dates. Enter a start point and an end point, and it returns the difference in hours, minutes, and seconds, often with a total in minutes or days. It suits work shifts, travel times, and project tracking.
The tool converts both inputs to a common unit, such as seconds, and subtracts the start value from the end value. It then converts the result back into readable units. If the end time is earlier than the start time, it treats the span as crossing midnight. Use the 24-hour format or check AM and PM carefully, since a wrong label changes the result by 12 hours.
- Enter the start date or time.
- Enter the end date or time.
- Read the duration shown in hours, minutes, and seconds.