C-获取当前时间

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

int main()
{
    time_t nowtime;
    struct tm* p;;
    time(&nowtime);
    p = localtime(&nowtime);

    char time[30] = "";
    sprintf(time, "%04d-%02d-%02d %02d:%02d:%02d", p->tm_year+1900, p->tm_mon+1, p->tm_mday,p->tm_hour,p->tm_min,p->tm_sec);
    printf("%s\n", time);
    /*printf("%02d:%02d:%02d\n",p->tm_hour,p->tm_min,p->tm_sec);*/
    return 0;
}