1 files changed, 5 insertions, 0 deletions
diff --git a/sql/time.cc b/sql/time.cc
index b6c91ff2148..249de3b879b 100644
--- a/sql/time.cc
+++ b/sql/time.cc
@@ -314,6 +314,11 @@ void localtime_to_TIME(MYSQL_TIME *to, struct tm *from)
 void calc_time_from_sec(MYSQL_TIME *to, long seconds, long microseconds)
 {
   long t_seconds;
+  // to->neg is not cleared, it may already be set to a useful value
+  to->time_type= MYSQL_TIMESTAMP_TIME;
+  to->year= 0;
+  to->month= 0;
+  to->day= 0;
   to->hour= seconds/3600L;
   t_seconds= seconds%3600L;
   to->minute= t_seconds/60L;