void exfat_tzset(void)
{
time_t now;
+ struct tm* utc;
tzset();
now = time(NULL);
- exfat_timezone = mktime(gmtime(&now)) - now;
+ utc = gmtime(&now);
+ /* gmtime() always sets tm_isdst to 0 because daylight savings never
+ affect UTC. Setting tm_isdst to -1 makes mktime() to determine whether
+ summer time is in effect. */
+ utc->tm_isdst = -1;
+ exfat_timezone = mktime(utc) - now;
}