Calculate The Difference Between Two Dates - Microsoft Support

You can calculate elapsed time by subtracting one time from another. First put a start time in a cell, and an end time in another. Make sure to type a full time, including the hour, minutes, and a space before the AM or PM. Here’s how:

1. Type a start time and end time.

Start date/time of 7:15 AM, End date/time of 4:30 PM

In this example, the start time is in cell D80 and the end time is in E80. Make sure to type the hour, minute, and a space before the AM or PM.

2. Set the h:mm AM/PM format.

Format cells dialog box, Custom command, h:mm AM/PM type

Select both dates and press CTRL + 1 (or Image of the MAC Command button icon + 1 on the Mac). Make sure to select Custom > h:mm AM/PM, if it isn’t already set.

3. Subtract the two times.

=E80-D80 and result: 9:15 AM

In another cell, subtract the start time cell from the end time cell.

4. Set the h:mm format.

Format Cells dialog, Custom command, h:mm type

Press CTRL + 1 (or Image of the MAC Command button icon + 1 on the Mac). Choose Custom > h:mm so that the result excludes AM and PM.

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