DATEDIF(), which means Date + Dif, is a compatibility function left over from Lotus 1-2-3 that Microsoft adopted in Excel version 2000, which is the only version that explains how this function works.
DATEVALUE is a Date and Time function, and its purpose is to convert a date in the form of text to a serial number. In this post, we will show you how to use the DATEVALUE function in Microsoft Excel.