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Time Duration Calculator

Calculate hours, minutes, and seconds between two clock times or the full duration between times on different dates.

Time Between Two Times

ExampleSample values — edit any field to see your result.

Results update as you type.

Time Duration

9 hours, 0 minutes, and 0 seconds

Estimated result

Hours Component
9
Minutes Component
0
Seconds Component
0
Total Hours
9.000000
Total Minutes
540.0000
Total Seconds
32,400
Time Duration9 hours, 0 minutes, and 0 seconds

Find the precise duration between two clock times or between times on two different dates. Results include a readable breakdown and totals in days, hours, minutes, and seconds.

Formula

Each 12-hour clock entry is converted to seconds after midnight. Dated mode adds calendar-day difference × 86,400 before subtracting the start time.

Examples

8:30 AM to 5:30 PM

The duration is 9 hours, equal to 540 minutes or 32,400 seconds.

Two dated times

From September 13, 2026 at 8:30 AM to September 15 at 5:30 PM is 2 days and 9 hours, or 57 hours total.

Frequently asked questions

What is the difference between the two modes?
Two Times compares clock times on one day. Two Dates combines calendar dates with start and end times for durations spanning multiple days.
Are seconds supported?
Yes. Both modes accept hours, minutes, seconds, and AM or PM.
What happens when the time-only end is earlier?
The time-only mode reports the absolute clock-time difference. Use Two Dates when the interval crosses midnight so the dates make the direction explicit.
Does daylight saving time affect the result?
No. The dated mode measures calendar days plus clock time without attaching a geographic timezone.

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