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.

The most useful Excel date functions handle everyday workflows like countdowns, working days, and month-based planning ...

Subtraction is the easiest way to count days between two dates in Excel. You can use the arithmetic operator – (minus sign) to subtract one date from another to find the number of days between them.

The DAYS function in Microsoft Excel returns the number of days between two dates. The formula for the DAYS (end_date, start_date). The DAYS360 function returns the number of days between two dates ...