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.

Excel's new Copilot function turns your prompts into formulas - how to try it It's so much easier to create, summarize, and analyze data now - no complex manual formulas required.

Microsoft is adding a COPILOT function to Excel, letting you use natural language prompts inside formulas to analyze, summarize, and categorize data.