I have a bunch of Google Spreadsheets with a lot of data (inputs from a webpage from past years), but unfortunately, there was no column with a timestamp at that time. Is there a way to pull from revision history the first modification date (from blank) of a cell? I really need to know when each input was made.

Only thing I found is how to create automatic timestamp column. But is there any way at all to find out when a cell was filles with data for the first time? I cannot find the answer.

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