取当地时间 localtime

	time_t   t; 
	struct   tm *tm; 
	t = time(NULL); 
	tm = localtime(&t); 
	int year = tm-> tm_year   +   1900;
	int month = tm-> tm_mon + 1;
	int day = tm-> tm_mday;
	int hour = tm-> tm_hour;
	int min = tm-> tm_min;
	int sec = tm-> tm_sec;