How to use Date Difference Calculator

The short answer

To find the difference between two dates, enter both: ClickZM shows the total days, the span in years, months and days, weeks, weekdays and hours, with an option to include the end date.

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 days are between two dates? Subtract the earlier date from the later one in days; from 1 January to 31 December in a common year is 364 days, or 365 counting both ends.

What does 'include end date' do? It adds one day, for counts where both the first and last day are part of the period, such as hotel nights versus days.