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The meaning of each is:
MemberMeaningRange
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
ÏÂÃæ³ÌÐò¼ÆËãÃÀ¹ú·ï»Ë³Ç (-7)£¬Öйú±±¾©(+8)£¬ºÍ±ùµº(0)ʱ¼ä£º
#include <stdio.h>
#include <time.h> 
struct {
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;
void show(struct tm * timeinfo,int j)
{
 int day,hour;
 if(j>0)
 {
if((j+timeinfo->tm_hour)/24==1)
 day=timeinfo->tm_mday+1;
else
 day=timeinfo->tm_mday;
 hour=(j+timeinfo->tm_hour)%24;
 }
 if(j==0)
 {
 day=timeinfo->tm_mday;
 hour=(j+timeinfo->tm_hour)%24;
 }
 if(j<0)
 {
if((j+timeinfo->tm_hour)/24<0)
 day=timeinfo->tm_mday-1;
else
 day=timeinfo->tm_mday;
 hour=(j+timeinfo->tm_hour)%24;
 }
 printf ( "%4d-%02d-%02d %02d:%02d:%02d\n",1900+timeinfo->tm_year, 1+timeinfo->tm_mon,
day,hour,timeinfo->tm_min,timeinfo->tm_sec);
}
void main ()
{
time_t timer;
struct tm * timeinfo,*ptm;
time ( &timer );//Pointer to an object of type time_t, where the time value is stored.
timeinfo = localtime ( &timer);//·µ»Øµ±µØÊ±ÇøÊ±¼ä
ptm = gmtime ( &timer );//·µ»Ø¸ñÁÖÖÆÊ±ÇøÊ±¼ä
printf("°´¸ñʽÏÔʾ±ùµºÊ±¼ä\n");
show(ptm,0);
printf("°´¸ñʽÏÔʾÃÀ¹ú·ï»Ë³Çʱ¼ä\n");
show(ptm,-7);
printf("°´¸ñʽÏÔʾÖйú±±¾©Ê±¼ä\n");
show(ptm,8);
}
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2009-09-24 19:26:30
°´¸ñʽÏÔʾÃÀ¹ú·ï»Ë³Çʱ¼ä
2009-09-24 12:26:30
°´¸ñʽÏÔʾÖйú±±¾©Ê±¼ä
2009-09-25 03:26:30


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