[Python] Python change a date format in dataframe

I have a dataset containing a column "date":

date item
20.3.2010 17:08 a
20.3.2010 11:16 b
2010-03-20 15:55:14.060 c
2010-03-21 13:56:45.077 d


I would like to convert all values that have format as 20.3.2010 17:08 into 2010-03-21 13:56:45.077.

Does anybody have an idea?

Thank you.

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