gmtsub
return gmtsub(timep, offset, tmp);
return gmtsub(timep, 0L, p_tm);
return gmtsub(timep, offset, &tm);
static struct tm * gmtsub(const time_t * timep, int_fast32_t offset,
return time1(tmp, gmtsub, 0L);
return time1(tmp, gmtsub, offset);