Dates

Time Duration Calculator

Time duration calculator for start and end clock times with optional break subtraction and decimal-hour output.

Calculate elapsed time between two clock readings. If the end is earlier than the start, the calculator treats it as the following day.

Subtract an optional break to find net duration. For multi-day periods or dates affected by daylight saving, use date-and-time values with an explicit time zone.

Frequently asked questions

Can it calculate overnight time?

Yes. An end time earlier than the start is treated as the next day.

What if start and end are the same?

The result is zero hours; use a date-aware tool if you intend a full 24-hour period.

Does it handle daylight saving time?

No. It compares clock readings without a date or time zone.