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I picked up basic VBA scripting and Excel suddenly got much better

The best part about using VBA in Excel is that you don't have to write a single line of code if you don't want to. Once ...
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Meet DATEDIF(), Excel’s secret Date & Time function that’s still handy

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.