code: def _ConvertToTimestamp(self, date, time):
      
      # Check that the strings have the correct length.
      if len(date) != 8:
        raise ValueError(
            'Unsupported length of date string: {0!s}'.format(repr(date)))
  
      if len(time) < 3 or len(time) > 4:
        raise ValueError(
            'Unsupported length of time string: {0!s}'.format(repr(time)))
  
      # Extract the date.
      try:
        year = int(date[:4], 10)
        month = int(date[4:6], 10)
        day = int(date[6:8], 10)
      except (TypeError, ValueError):
        raise ValueError('Unable to parse date string: {0!s}'.format(repr(date)))
  
      # Extract the time. Note that a single-digit hour value has no leading zero.
      try:
        hour = int(time[:-2], 10)
        minutes = int(time[-2:], 10)
      except (TypeError, ValueError):
        raise ValueError('Unable to parse time string: {0!s}'.format(repr(date)))
  
      time_elements_tuple = (year, month, day, hour, minutes, 0)
      date_time = dfdatetime_time_elements.TimeElements(
          time_elements_tuple=time_elements_tuple)
      date_time.is_local_time = True
      # TODO: add functionality to dfdatetime to control precision.
      date_time._precision = dfdatetime_definitions.PRECISION_1_MINUTE  # pylint: disable=protected-access
  
      return date_time
docs: Converts date and time strings into a timestamp.
  
      Recent versions of Office Scan write a log field with a Unix timestamp.
      Older versions may not write this field; their logs only provide a date and
      a time expressed in the local time zone. This functions handles the latter
      case.
  
      Args:
        date (str): date as an 8-character string in the YYYYMMDD format.
        time (str): time as a 3 or 4-character string in the [H]HMM format or a
            6-character string in the HHMMSS format.
  
      Returns:
        dfdatetime_time_elements.TimestampElements: the parsed timestamp.
  
      Raises:
        ValueError: if the date and time values cannot be parsed.