Remove dtype datetime NaT

Question

I am preparing a pandas df for output, and would like to remove the NaN and NaT in the table, and leave those table locations blank. An example would be

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Answer 1

If all you want to do is convert to a string:

In [37]: df1.to_csv(None,sep=' ')
Out[37]: ' col1 col2 date\n0 a b "2014-08-14 00:00:00"\n1 c  \n'

To replace missing values with a string

In [36]: df1.to_csv(None,sep=' ',na_rep='missing_value')
Out[36]: ' col1 col2 date\n0 a b "2014-08-14 00:00:00"\n1 c missing_value missing_value\n'