diff --git a/etc/ChangeLog b/etc/ChangeLog
index 11e7e5ca108..20ded2fd847 100644
--- a/etc/ChangeLog
+++ b/etc/ChangeLog
@@ -1,3 +1,7 @@
+2012-09-13  Paul Eggert  <eggert@cs.ucla.edu>
+
+	* NEWS: Document timer format change (Bug#12430).
+
 2012-09-11  Paul Eggert  <eggert@cs.ucla.edu>
 
 	Simplify, document, and port floating-point (Bug#12381).
diff --git a/etc/NEWS b/etc/NEWS
index a7388c4e9fa..eb5a2ed6660 100644
--- a/etc/NEWS
+++ b/etc/NEWS
@@ -101,6 +101,11 @@ machines.  Other functions that use this format, such as
 file-attributes and format-time-string, have been changed accordingly.
 Old-format time stamps are still accepted.
 
+** The format of timers in timer-list and timer-idle-list is now
+[HIGH-SECONDS LOW-SECONDS USECS PSECS REPEAT-DELAY FUNCTION ARGS IDLE-DELAY].
+The PSECS slot is new, and uses picosecond resolution.  It can be
+accessed via the new timer--psecs accessor.
+
 ** Emacs now generates backtraces on fatal errors.
 On encountering a fatal error, Emacs now outputs a textual description
 of the fatal signal, and a short backtrace on platforms like glibc
diff --git a/lisp/ChangeLog b/lisp/ChangeLog
index 41dc46021f6..1bb8f913c20 100644
--- a/lisp/ChangeLog
+++ b/lisp/ChangeLog
@@ -1,3 +1,11 @@
+2012-09-13  Paul Eggert  <eggert@cs.ucla.edu>
+
+	Fix glitches caused by addition of psec to timers (Bug#12430).
+	* image.el (image-animate-timer):
+	* time.el (display-time-world-timer):
+	Use timer--function and timer--args rather than raw access to
+	timer vector.
+
 2012-09-13  Glenn Morris  <rgm@gnu.org>
 
 	* emacs-lisp/bytecomp.el (byte-compile-warning-prefix):
diff --git a/lisp/gnus/ChangeLog b/lisp/gnus/ChangeLog
index 5c7f106f6db..3f69a84db88 100644
--- a/lisp/gnus/ChangeLog
+++ b/lisp/gnus/ChangeLog
@@ -1,3 +1,9 @@
+2012-09-13  Paul Eggert  <eggert@cs.ucla.edu>
+
+	Fix glitches caused by addition of psec to timers.
+	* gnus-art.el (gnus-article-stop-animations): Use timer--function
+	rather than raw access to timer vector.
+
 2012-09-11  Julien Danjou  <julien@danjou.info>
 
 	* gnus-notifications.el (gnus-notifications): Check for nil values in
diff --git a/lisp/gnus/gnus-art.el b/lisp/gnus/gnus-art.el
index b9020a40b75..4dc004f04d4 100644
--- a/lisp/gnus/gnus-art.el
+++ b/lisp/gnus/gnus-art.el
@@ -4554,7 +4554,7 @@ commands:
 (defun gnus-article-stop-animations ()
   (dolist (timer (and (boundp 'timer-list)
 		      timer-list))
-    (when (eq (elt timer 5) 'image-animate-timeout)
+    (when (eq (timer--function timer) 'image-animate-timeout)
       (cancel-timer timer))))
 
 (defun gnus-stop-downloads ()
diff --git a/lisp/image.el b/lisp/image.el
index 7801923c3fe..99c0a74a512 100644
--- a/lisp/image.el
+++ b/lisp/image.el
@@ -645,8 +645,8 @@ number, play until that number of seconds has elapsed."
     (while tail
       (setq timer (car tail)
 	    tail (cdr tail))
-      (if (and (eq (aref timer 5) 'image-animate-timeout)
-	       (eq (car-safe (aref timer 6)) image))
+      (if (and (eq (timer--function timer) 'image-animate-timeout)
+	       (eq (car-safe (timer--args timer)) image))
 	  (setq tail nil)
 	(setq timer nil)))
     timer))
diff --git a/lisp/time.el b/lisp/time.el
index 8d43b565416..fe3cdbb57be 100644
--- a/lisp/time.el
+++ b/lisp/time.el
@@ -575,7 +575,8 @@ To turn off the world time display, go to that window and type `q'."
     (let ((list timer-list))
       (while list
         (let ((elt (pop list)))
-          (when (equal (symbol-name (aref elt 5)) "display-time-world-timer")
+          (when (equal (symbol-name (timer--function elt))
+		       "display-time-world-timer")
             (cancel-timer elt)))))))
 
 ;;;###autoload