Add or subtract time - Microsoft Support
Let's say that you need to add two different time values together to get a total. Or, you need to subtract one time value from another to get the total time spent working on a project. As you'll see in the sections below, Excel makes it easy to add or subtract time. Windows Web.
Applies To:
Excel for Microsoft 365, Excel for the web, Excel 2021, Excel 2019, Excel 2016