UTC日期转时间戳

网上的方法用mktime来转换日期到时间戳，会被当前环境的时区影响，现在这么做，用UTC的日期转时间戳这样要转换各地的时区也简单

unsigned long
utcMktime(const unsigned int year0, const unsigned int mon0,
       const unsigned int day, const unsigned int hour,
       const unsigned int min, const unsigned int sec)
{
    unsigned int mon = mon0, year = year0;
    /* 1..12 -> 11,12,1..10 */
    if ( >= (int) (mon -= )) {
        mon += ;  /* Puts Feb last since it has leap day */
        year -= ;
    }  

    return ((((unsigned long)
          (year/ - year/ + year/ + *mon/ + day) +
          year* -
        )* + hour /* now have hours */
      )* + min /* now have minutes */
    )* + sec; /* finally seconds */
}

使用很简单这样就行了

//UTC时间的2019/4/25 13:24:17即北京时间2019/4/25 21:24:17
printf("---%d---\n",(int)utcMktime(,,,,,));