github.com/afumu/libc@v0.0.6/musl/src/time/timegm.c (about)

     1  #define _GNU_SOURCE
     2  #include "time_impl.h"
     3  #include <errno.h>
     4  
     5  time_t timegm(struct tm *tm)
     6  {
     7  	struct tm new;
     8  	long long t = __tm_to_secs(tm);
     9  	if (__secs_to_tm(t, &new) < 0) {
    10  		errno = EOVERFLOW;
    11  		return -1;
    12  	}
    13  	*tm = new;
    14  	tm->tm_isdst = 0;
    15  	tm->__tm_gmtoff = 0;
    16  	tm->__tm_zone = __utc;
    17  	return t;
    18  }