--- ./coreutils/src/date.c.orig	2005-09-16 10:08:00.000000000 +0200
+++ ./coreutils/src/date.c	2005-09-19 19:02:30.378609502 +0200
@@ -271,6 +271,15 @@
 	}
     }
 
+#ifdef HAVE_TZSET
+  /* Cannot use HAVE_TZNAME here. sigh, address@hidden */
+  extern char *tzname[2];
+  if (!tzname[1][0])
+    {
+      error (0, 0, _("invalid timezone %s, using default"), tzname[0]);
+    }
+#endif
+
   line = NULL;
   buflen = 0;
   ok = true;