linux 时间转化范例。

#include <stdlib.h>
#include <time.h>
#include <string.h>
#include <stdio.h>
#include <sys/time.h>

//char *strptime(const char *s, const char *format, struct tm *tm);
//size_t strftime(char *s, size_t max, const char *format, const struct tm *tm);


int main()
{
    char outstr[128]={0};
    time_t t;
    struct tm *tmp;

    t = time(NULL);
    tmp = localtime(&t);

    strftime(outstr, sizeof(outstr), "%a, %d %b %Y %H:%M:%S %Z", tmp);
    printf("%s.\n",outstr);
    //return 0;



    const char date[] = "Fri, 21 Oct 2016 20:06:50 GMT";
    strptime(date, "%a, %d %b %Y %H:%M:%S %Z", tmp);
    t = mktime(tmp);
    t += (8*60*60);
    tmp = localtime(&t);

    strftime(outstr, sizeof(outstr), "%Y-%m-%d %H:%M:%S %Z", tmp);
    printf("%s.\n",outstr);

}