If time to switch to DST is later in the year switch back in the next

year.

1 files changed, 7 insertions, 0 deletions

diff --git a/time/tzset.c b/time/tzset.c
index 671c6103d5..970bbecd44 100644
--- a/time/tzset.c
+++ b/time/tzset.c
@@ -548,6 +548,13 @@ tz_compute (timer, tm)
   if (! compute_change (&tz_rules[0], 1900 + tm->tm_year) ||
       ! compute_change (&tz_rules[1], 1900 + tm->tm_year))
     return 0;
+  /* We have to distinguish between northern and southern hemisphere.
+     For the later the daylight saving time ends in the next year.
+     It is easier to detect this after first computing the time for the
+     wrong year since now we simply can compare the times to switch.  */
+  if (tz_rules[0].change > tz_rules[1].change
+      && ! compute_change (&tz_rules[1], 1900 + tm->tm_year + 1))
+    return 0;
 
   __daylight = tz_rules[0].offset != tz_rules[1].offset;
   __timezone = -tz_rules[0].offset;