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How to calculate time difference with milliseconds in Excel?

Author: Sun Last Modified: 2024-09-05

To calculate the time difference is the normal job in our daily Excel routine. However, in this article, I am going to talk about calculating time difference with milliseconds in Excel.

Time difference with milliseconds

Time difference with milliseconds

Using the general formula =B2-A2 will get an error result while the value in B2 is smaller than A2, here I introduce a formula to handle this.

Select a cell that you will place the result in, type this formula =B2-A2+(A2>B2), press Enter key, and drag autofill handle over the cells needed this formula. See screenshot:
apply a formula to calculate time difference with milliseconds

Tip: If you want to convert general time format to millisecond format, right click at the time cells and select Format Cells to enable the Format Cells dialog, select Custom in the Category list under Number tab, and type this hh:mm:ss.000 into the text box. See screenshot:
format the results as time format

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