X-Git-Url: http://git.sven.stormbind.net/?p=sven%2Fexfat-utils.git;a=blobdiff_plain;f=libexfat%2Ftime.c;h=3ef99e8dacd8e973c145d50c4be1a390cb7c1ac0;hp=7d2becdae68871c756731e94471f71295a14d351;hb=9fc645b877c3ed3d6436a8aad3daa584b8ad1688;hpb=d99d52ff73deacfe427403765682015d5825799b

diff --git a/libexfat/time.c b/libexfat/time.c
index 7d2becd..3ef99e8 100644
--- a/libexfat/time.c
+++ b/libexfat/time.c
@@ -3,7 +3,7 @@
 	exFAT file system implementation library.
 
 	Free exFAT implementation.
-	Copyright (C) 2010-2016  Andrew Nayenko
+	Copyright (C) 2010-2017  Andrew Nayenko
 
 	This program is free software; you can redistribute it and/or modify
 	it under the terms of the GNU General Public License as published by
@@ -151,8 +151,14 @@ void exfat_unix2exfat(time_t unix_time, le16_t* date, le16_t* time,
 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;
 }