def __init__(self, year, month, day_of_month):
super(DateTimeEpoch, self).__init__()<EOL>self.day_of_month = day_of_month<EOL>self.month = month<EOL>self.year = year<EOL>
Initializes a date time epoch.

        Args:
          year (int): year that is the start of the epoch e.g. 1970.
          month (int): month that is the start of the epoch, where 1 represents
              January.
          day_of_month (int): day of the month that is the start of the epoch,
              where 1 represents the first day.