bug#641: format-time-string %Z does not work, starting with Emacs 22.2

["Drew Adams" <drew.adams@oracle.com>]

emacs -Q
M-: (format-time-string "%Z) ==> ""
M-: (format-time-string "%z) ==> "-0700"
 
The %Z string is incorrect. In my case, it should be (as it is in
Emacs 20 and Emacs 22.1): "Pacific Daylight Time".
 
This same bug appears in Emacs 23.  This is a regression from Emacs
22.1.
 

In GNU Emacs 22.2.1 (i386-mingw-nt5.1.2600)
 of 2008-03-26 on RELEASE
Windowing system distributor `Microsoft Corp.', version 5.1.2600
configured using `configure --with-gcc (3.4)'
 
Important settings:
  value of $LC_ALL: nil
  value of $LC_COLLATE: nil
  value of $LC_CTYPE: nil
  value of $LC_MESSAGES: nil
  value of $LC_MONETARY: nil
  value of $LC_NUMERIC: nil
  value of $LC_TIME: nil
  value of $LANG: ENU
  locale-coding-system: cp1252
  default-enable-multibyte-characters: t
 
Major mode: Help
 
Minor modes in effect:
  encoded-kbd-mode: t
  tooltip-mode: t
  tool-bar-mode: t
  mouse-wheel-mode: t
  menu-bar-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  blink-cursor-mode: t
  unify-8859-on-encoding-mode: t
  utf-translate-cjk-mode: t
  auto-compression-mode: t
  line-number-mode: t
  view-mode: t