From: Leah Neukirchen <leah@vuxu.org>
Date: Thu, 3 May 2018 16:42:18 +0000 (+0200)
Subject: unset tm_isdst before doing date operations
X-Git-Tag: v0.3
X-Git-Url: https://git.netwichtig.de/gitweb/?a=commitdiff_plain;h=3027c580b50c028d5b3c3617704bf987a7897a83;p=user%2Fhenk%2Fcode%2Fsnooze.git

unset tm_isdst before doing date operations

Else mktime(3) can change tm_hour due to DST change.
---

diff --git a/snooze.c b/snooze.c
index c08cdc3..1dda3eb 100644
--- a/snooze.c
+++ b/snooze.c
@@ -182,11 +182,14 @@ next_day:
 			tm->tm_mday++;
 		}
 
+		tm->tm_isdst = -1;
 		tm->tm_sec = 0;
 		tm->tm_min = 0;
 		tm->tm_hour = 0;
 
 		t = mktime(tm);
+		tm->tm_isdst = -1;
+
 		if (t > from+(366*24*60*60))  // no result within a year
 			return -1;
 	}