Use a CTE that returns the row ID and the result of the DateDiff, then join that to your existing result set? It may or may not be faster, so as always, test it to see.

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.

Microsoft Excel remains a powerful tool for data analysis and manipulation, and staying up-to-date with the latest formulas is crucial for maximizing your productivity and improving your spreadsheets.