--- orage-4.8.0.orig/panel-plugin/xfce4-orageclock-plugin.c
+++ orage-4.8.0/panel-plugin/xfce4-orageclock-plugin.c
@@ -123,6 +123,10 @@ static gboolean oc_get_time(Clock *clock
     ClockLine *line;
     GList   *tmp_list;
 
+    /* TZ might have been changed outside Orage, refresh to take the change
+       into account. */
+    oc_timezone_set(clock);
+
     time(&t);
     localtime_r(&t, &clock->now);
     for (tmp_list = g_list_first(clock->lines);