I have a google sheet that asks people to enter a date in column A. The date must be valid and can be today's day or a date in the past. It cannot be a date in the future. I tried a custom data validation rule of =AND(ISDATE($A2),$A2<=today()). This seems to work, but then users started creating dates by clicking a cell already entered and dragging down the blue dot to autocreate dates for the future. Data validation does not seem to apply to data made in this way. I tried going to Tools--Suggestion Controls-- and unchecking Enable Autocomplete, but nothing changed. Is there a way to make data validation apply? Barring that, can one prevent creating dates by dragging a cell down the column?
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