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A Datetime object cannot be compared with a string directly. However, pandas Series of datetime objects can be compared with string date directly (both by operators and methods). The comparison is done by parsing the string to a datetime object. An exception will be thrown if the string cannot be parsed into a datetime object.

Date/time utilities in the pandas module are more flexible/powerful than that in the datetime module. It is suggested that you use date/time utilities in the pandas module when you use DataFrame/Series in the pandas module.

1. pandas.to_datetime works on an iterable object, handles missing values and nano seconds.

2. pandas.Series.dt.strftime