// Fig. 9.23: Date.h 
// Date class definition; member functions defined in Date.cpp
#pragma once // prevent multiple inclusions of header
#include <string>

class Date {
public:
   static const int monthsPerYear{12}; // months in a year
   Date(int year, int month, int day);
   std::string toString() const; // date string in yyyy-mm-dd format
   ~Date(); // implementation displays when destruction occurs
private:
   int m_year; // any year
   int m_month; // 1-12 (January-December)
   int m_day; // 1-31 based on month

   // utility function to check if day is proper for month and year
   bool checkDay(int day) const;
};


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