linux c 获取系统时间

#include <time.h>

main()

{

time_t timep;

time (&timep);

printf(“%s”,asctime(gmtime(&timep)));

}

#include<time.h>

main()

{

time_t timep;

time (&timep);

printf(“%s”,ctime(&timep));

}

#include<sys/time.h>

#include<unistd.h>

main(){

struct timeval tv;

struct timezone tz;

gettimeofday (&tv , &tz);

printf(“tv_sec; %d\n”, tv,.tv_sec) ;

printf(“tv_usec; %d\n”,tv.tv_usec);

printf(“tz_minuteswest; %d\n”, tz.tz_minuteswest);

printf(“tz_dsttime, %d\n”,tz.tz_dsttime);

}

#include<sys/time.h>

#include<unistd.h>

main(){

struct timeval tv;

struct timezone tz;

gettimeofday (&tv , &tz);

printf(“tv_sec; %d\n”, tv,.tv_sec) ;

printf(“tv_usec; %d\n”,tv.tv_usec);

printf(“tz_minuteswest; %d\n”, tz.tz_minuteswest);

printf(“tz_dsttime, %d\n”,tz.tz_dsttime);

}

#include<time.h>

main(){

char *wday[]={“Sun”,”Mon”,”Tue”,”Wed”,”Thu”,”Fri”,”Sat”};

time_t timep;

struct tm *p;

time(&timep);

p=localtime(&timep); /*取得当地时间*/

printf (“%d%d%d ”, (1900+p->tm_year),( l+p->tm_mon), p-



>tm_mday);

printf(“%s%d:%d:%d\n”, wday[p->tm_wday],p->tm_hour, p



->tm_min, p->tm_sec);

}

#include<time.h>

main()

{

time_t timep;

strcut tm *p;

time(&timep);

printf(“time() : %d \n”,timep);

p=localtime(&timep);

timep = mktime(p);

printf(“time()->localtime()->mktime():%d\n”,timep);

}

#include<time.h>

main()

{

int seconds= time((time_t*)NULL);

printf(“%d\n”,seconds);

}

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