DATEDIF(), which means Date + Dif, is a compatibility function left over from Lotus 1-2-3 that Microsoft adopted in Excel version 2000. It's fallen off current Excel menus, but you can still use it.

Select the time format you want to use in the "Type" box. For example, click "1:30:55 PM" to format the text as H:MM:SS -- where H represents hours, M represents minutes and S represents seconds.

BOULDER, Colo.—January 5, 2016—The Advanced Function Presentation Consortium (AFPC), an international consortium of print industry stakeholders working together to further enhance the Advanced ...