1. A "Date" concept

• Consider a program that uses dates:

  
      #include <iostream>
      int main()
      {
          std::cout << "3/8/2010" << '\n';
          std::cout << "7/20/2011" << '\n';
          return 0;
      }
  
  

  Hardcoded dates such "3/8/2010" aren't very useful.