re-initialise the timezone on each new connection. This means you

don't need to restart smbd after a DST change.
(This used to be commit 2a50d5d5ed4ca7d2b546d7337ec88c527ec82689)

source3/smbd/server.c

@@ -4776,6 +4776,9 @@ static void process(void)
   }
 #endif    
 
+  /* re-initialise the timezone */
+  TimeInit();
+
   while (True)
   {
     int deadtime = lp_deadtime()*60;