diff --git a/test/ChangeLog b/test/ChangeLog
index 4e47f95b066..144f1078319 100644
--- a/test/ChangeLog
+++ b/test/ChangeLog
@@ -1,6 +1,12 @@
+2014-08-02  Glenn Morris  <rgm@gnu.org>
+
+	* automated/icalendar-tests.el (icalendar--decode-isodatetime):
+	Use more precise TZ specification, as per 2013-08-04.
+
 2014-07-30  Ulf Jasper  <ulf.jasper@web.de>
 
-	* automated/icalendar-tests.el (icalendar--decode-isodatetime): New test.
+	* automated/icalendar-tests.el (icalendar--decode-isodatetime):
+	New test.
 
 2014-07-28  Dmitry Antipov  <dmantipov@yandex.ru>
 
diff --git a/test/automated/icalendar-tests.el b/test/automated/icalendar-tests.el
index 2ffa3911ee3..0f655232e71 100644
--- a/test/automated/icalendar-tests.el
+++ b/test/automated/icalendar-tests.el
@@ -420,8 +420,8 @@ END:VEVENT
 	result)
     (unwind-protect
 	(progn
-	  ;; Use Eastern European Time (UTC+1, UTC+2 daylight saving)
-	  (setenv "TZ" "EET")
+	  ;; Use Eastern European Time (UTC+2, UTC+3 daylight saving)
+	  (setenv "TZ" "EET-2EEST,M3.5.0/3,M10.5.0/4")
 
           (message "%s" (current-time-zone (encode-time 0 0 10 1 1 2013 0)))
           (message "%s" (current-time-zone (encode-time 0 0 10 1 8 2013 0)))