old_contents: """class to convert datetime values"""
  
  import datetime
  
  class DatetimeConverter(object):
      """stuff"""
  
      _EPOCH_0 = datetime.datetime(1970, 1, 1)
  
      def __init__(self):
          """stuff"""
  
          pass
  
      @staticmethod
      def get_tomorrow():
          """stuff"""
  
          return datetime.datetime.today() + datetime.timedelta(days=1)
  
      @classmethod
      def get_timestamp(cls, datetime_obj):
          """helper method to return timestamp fo datetime object"""
  
          return (datetime_obj - cls._EPOCH_0).total_seconds()
  
      @classmethod
      def get_tomorrow_timestamp(cls):
          """stuff"""
  
          return cls.get_timestamp(cls.get_tomorrow())
  
new_contents: """class to convert datetime values"""
  
  import datetime
  
  class DatetimeConverter(object):
      """stuff"""
  
      _EPOCH_0 = datetime.datetime(1970, 1, 1)
  
      def __init__(self):
          """stuff"""
  
          pass
  
      @staticmethod
      def get_tomorrow():
          """stuff"""
  
          return datetime.datetime.today() + datetime.timedelta(days=1)
  
      @staticmethod
      def get_yesterday():
  
          return datetime.datetime.today() - datetime.timedelta(days=1)
  
      @classmethod
      def get_timestamp(cls, datetime_obj):
          """helper method to return timestamp fo datetime object"""
  
          return (datetime_obj - cls._EPOCH_0).total_seconds()
  
      @classmethod
      def get_tomorrow_timestamp(cls):
          """stuff"""
  
          return cls.get_timestamp(cls.get_tomorrow())
  
      @classmethod
      def get_yesterday_timestamp(cls):
  
          return cls.get_timestamp(cls.get_yesterday())
  
subject: Add utility methods for yesterday's date