I have a massive spreadsheet in which all dates are written this way:
2 days ago
9 days ago
34 days ago
54 days ago
etc.
Is there a clever Python way to convert these data to the actual dates, if I tell Python what date '1 day ago' is?
Use timedelta.
Extract the value from that string in your spreadsheet and then use
d = date.today() - timedelta(days_to_subtract)