Index: ext/calendar/cal_unix.c
===================================================================
RCS file: /repository/php-src/ext/calendar/cal_unix.c,v
retrieving revision 1.17.2.2.2.1
diff -u -p -d -r1.17.2.2.2.1 cal_unix.c
--- ext/calendar/cal_unix.c	1 Jan 2007 09:35:48 -0000	1.17.2.2.2.1
+++ ext/calendar/cal_unix.c	5 Jun 2007 16:53:28 -0000
@@ -50,6 +50,10 @@ PHP_FUNCTION(unixtojd)
   }
 
   ta = php_localtime_r(&t, &tmbuf);
+  if (!ta) {
+	  RETURN_FALSE;
+  }
+
   jdate = GregorianToSdn(ta->tm_year+1900, ta->tm_mon+1, ta->tm_mday);
   
   RETURN_LONG(jdate);