C/C++における時間に関する関数localtime()

関数:struct tm*localtime(const time_t*timer);

#include <stdio.h>
#include <time.h>

int main()
{
	time_t test;
	test = time(NULL);//        ——    1970-01-01-00:00:00       
	printf("%s
",ctime(&test));//                     ,       
	printf("local hour:%d
",localtime(&test)->tm_hour); 
	//localtime         tm     ，tm         
	//  asctime()    tm           string   ( ctime())
	struct tm * ptime; 
	ptime = localtime(&test);
	printf("%s
",asctime(ptime)); 
	
	return 0;
}
/*
The structure contains nine members of type int, which are (in any order):
int tm_sec;
int tm_min;
int tm_hour;
int tm_mday;
int tm_mon;
int tm_year;
int tm_wday;
int tm_yday;
int tm_isdst;

tm_sec	seconds after the minute	0-61*
tm_min	minutes after the hour	0-59
tm_hour	hours since midnight	0-23
tm_mday	day of the month	1-31
tm_mon	months since January	0-11
tm_year	years since 1900	
tm_wday	days since Sunday	0-6
tm_yday	days since January 1	0-365
tm_isdst	Daylight Saving Time flag	
*/