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settimeofday
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time();
localtime();
strftime();

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settimeofday
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time();
localtime();
strftime();

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int main()
{
//struct tm tms; //´æ´¢¹ú¼Ê±ê׼ʱ¼ä
//time_t time = mktime(&tms); //·µ»Ø×Ô¹ú¼Ê±ê׼ʱ¼äºóµÄÃëÊý
//struct tm *tmsptr = localtime(&time); //ת»»³É±¾µØʱ¼ä
struct tm p;
char showtime[100];
time_t timep;
p.tm_sec=59;
p.tm_min=59;
p.tm_hour=23;
p.tm_year=2020-1970;
p.tm_mon=11;
p.tm_mday=30;
timep=mktime(&p);
printf("the seconds=%d\n",timep);
struct tm *timenow = localtime(&timep); 
sprintf(showtime,"%d/%d/%d/%d:%d",(timenow->tm_year+1970),timenow->tm_mon,timenow