Converting epoch to string in format yyyy-mm-dd, or maybe it is not necessary

[Andre Müller]

I'm not familar with pandas.

If you look on stackoverfolow you'll find this solution:

df.epoch = pd.to_datetime(df.epoch)
https://stackoverflow.com/questions/17134716/convert-dataframe-column-type-from-string-to-datetime

But in this case, it's not a plain string, then it's a datetime object.

Greetings
Andre