risolto da solo:
codice:
# include <iostream>
# include <stdio.h>
# include <time.h>

using namespace std;



main()
{
	time_t tempo;
	struct tm *data;
	
	tempo = time(NULL);
	data = localtime(&tempo);
	cout << data->tm_mday << "/";
    cout << data->tm_mon << "/";
    cout << data->tm_year + 1900;   
    getchar();   
}