I have a dataframe that among other things, contains a column of the number of milliseconds passed since 1970-1-1. I need to convert this column of ints to timestamp data, so I can then ultimately convert it to a column of datetime data by adding the timestamp column series to a series that consists entirely of datetime values for 1970-1-1.

I know how to convert a series of strings to datetime data (pandas.to_datetime), but I can't find or come up with any solution to convert the entire column of ints to datetime data OR to timestamp data.


You can specify the unit of a pandas to_datetime call.

Stolen from here:

# assuming `df` is your data frame and `date` is your column of timestamps

df['date'] = pandas.to_datetime(df['date'], unit='s')

Should work with integer datatypes, which makes sense if the unit is seconds since the epoch.

  • 1
    $\begingroup$ what's the revers function? $\endgroup$ – Francesco Boi Jan 22 at 15:51

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