code: def CopyToDateTimeString(self):
      
      if self._timestamp is None:
        return None
  
      number_of_days, hours, minutes, seconds = self._GetTimeValues(
          int(self._timestamp))
  
      year, month, day_of_month = self._GetDateValuesWithEpoch(
          number_of_days, self._EPOCH)
  
      microseconds = int(
          (self._timestamp % 1) * definitions.MICROSECONDS_PER_SECOND)
  
      return '{0:04d}-{1:02d}-{2:02d} {3:02d}:{4:02d}:{5:02d}.{6:06d}'.format(
          year, month, day_of_month, hours, minutes, seconds, microseconds)
docs: Copies the Cocoa timestamp to a date and time string.
  
      Returns:
        str: date and time value formatted as: YYYY-MM-DD hh:mm:ss.###### or
            None if the timestamp cannot be copied to a date and time string.