degesch: finally fix rearm_date_change_timer()

1 files changed, 11 insertions, 3 deletions

diff --git a/degesch.c b/degesch.c
index 929e43c..5b2177d 100644
--- a/degesch.c
+++ b/degesch.c
@@ -9111,10 +9111,18 @@ on_flush_timer (struct app_context *ctx)
 static void
 rearm_date_change_timer (struct app_context *ctx)
 {
-	const time_t seconds_per_day = 60 * 60 * 12;
+	struct tm tm_;
 	const time_t now = time (NULL);
-	const time_t midnight = (now + seconds_per_day - 1)
-		/ seconds_per_day * seconds_per_day;
+	if (!soft_assert (localtime_r (&now, &tm_)))
+		return;
+
+	tm_.tm_sec = tm_.tm_min = tm_.tm_hour = 0;
+	tm_.tm_mday++;
+	tm_.tm_isdst = -1;
+
+	const time_t midnight = mktime (&tm_);
+	if (!soft_assert (midnight != (time_t) -1))
+		return;
 	poller_timer_set (&ctx->date_chg_tmr, (midnight - now) * 1000);
 }