code: def datetime_to_str(self,format="%Y-%m-%dT%H:%M:%S%ZP"):
          
          if(self.dtype != datetime.datetime):
              raise TypeError("datetime_to_str expects SArray of datetime as input SArray")
  
          with cython_context():
              return SArray(_proxy=self.__proxy__.datetime_to_str(format))
docs: Create a new SArray with all the values cast to str. The string format is
          specified by the 'format' parameter.
  
          Parameters
          ----------
          format : str
              The format to output the string. Default format is "%Y-%m-%dT%H:%M:%S%ZP".
  
          Returns
          -------
          out : SArray[str]
              The SArray converted to the type 'str'.
  
          Examples
          --------
          >>> dt = datetime.datetime(2011, 10, 20, 9, 30, 10, tzinfo=GMT(-5))
          >>> sa = turicreate.SArray([dt])
          >>> sa.datetime_to_str("%e %b %Y %T %ZP")
          dtype: str
          Rows: 1
          [20 Oct 2011 09:30:10 GMT-05:00]
  
          See Also
          ----------
          str_to_datetime
  
          References
          ----------
          [1] Boost date time from string conversion guide (http://www.boost.org/doc/libs/1_48_0/doc/html/date_time/date_time_io.html)