'Series' object has no attribute 'to_datetime'

I am kind of late, but still useful for future readers.

Below code converts a column of type object in a pandas df to type timestamp

df.timeStamp = pd.to_datetime(df.timeStamp)

Because to_datetime is only a valid attribute to pandas module, that's all.

So that's why:

AttributeError: 'Series' object has no attribute 'to_datetime'

(see highlighted part)

So of course, to_datetime can't be used that way.