int main(int argc, char *argv[]){
	std::string date_string;
	std::cout<<"Enter the date in DD-MM-YYYY format."<<std::endl;
	std::cin>>date_string;
	int d=std::atoi(date_string.substr(0, 2).c_str());
	int m=std::atoi(date_string.substr(3, 2).c_str());
	int y=std::atoi(date_string.substr(6, 4).c_str());
	int days_of_month[]={31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};
	if(m>12 || m<1){
		std::cout<<"invalid"<<std::endl;
	}else{
		int is_leap=(y%4==0) && ((y%100!=0) || (y%100==0 && y%400==0));
		if(d<=(days_of_month[m-1]+(m==2? is_leap : 0))){
			std::cout<<"The given date is valid."<<std::endl;
		}else{
			std::cerr<<"The given date is *INVALID* !"<<std::endl;
		}
	}
}

/* 
Sample Run :
rahul@kodersbox:~/Desktop$ g++ date_validation.cpp -o date_validation
rahul@kodersbox:~/Desktop$ ./date_validation
Enter the date in DD-MM-YYYY format.
29-02-1000
The given date is *INVALID* !
*/