How to use Time Duration Calculator

The short answer

To calculate a time duration, enter a start and end date and time. ClickZM shows the elapsed time in days, hours and minutes, plus total hours, minutes, seconds and weeks.

It runs in your browser. What you enter is not uploaded.

How to use it

Enter your values in the fields; defaults show a worked example.

Pick the units or options that apply to you.

Read the result, which updates instantly as you type.

Check the formula note under the result to see exactly how it was worked out.

Limits worth knowing

How many hours are between 9 am and 5:30 pm? 8.5 hours (8 hours 30 minutes).

Does it account for daylight saving? Both times are treated as wall-clock times in one zone, so a daylight-saving shift between them is not added.