linux获取当前系统的时间

#include <time.h>
#include <sys/time.h>

void sysLocalTime(char *str_info)
{
    time_t             timesec;
    struct tm         *p;

    time(&timesec);
    p = localtime(&timesec);

    printf("%d%d%d - %d:%2d:%d   %s\n", 1900+p->tm_year, 1+p->tm_mon, p->tm_mday, p->tm_hour, p->tm_min, p->tm_sec, str_info);

}

void sysUsecTime()
{
    struct timeval    tv;
    struct timezone tz;

    struct tm         *p;

    gettimeofday(&tv, &tz);
    printf("tv_sec:%ld\n",tv.tv_sec);
    printf("tv_usec:%ld\n",tv.tv_usec);
    printf("tz_minuteswest:%d\n",tz.tz_minuteswest);
    printf("tz_dsttime:%d\n",tz.tz_dsttime);

    p = localtime(&tv.tv_sec);
    printf("time_now:%d%d%d%d%d%d.%ld\n", 1900+p->tm_year, 1+p->tm_mon, p->tm_mday, p->tm_hour, p->tm_min, p->tm_sec, tv.tv_usec);
}

int main(void)
{
    char *str_info="xxxxxxxxxxxxxxx";
    sysLocalTime(str_info);
    printf("============gettimeofday==============\n");

    sysUsecTime();

    return 0;
}