From 085b704108e13ba22ac2ce549e259e291740ad68 Mon Sep 17 00:00:00 2001
From: Kevin B Kenny <kennykb@acm.org>
Date: Fri, 2 Dec 2005 19:47:36 +0000
Subject: another little speedup to [clock format]

---
 ChangeLog         |  4 +++-
 library/clock.tcl | 11 +++++++----
 2 files changed, 10 insertions(+), 5 deletions(-)

diff --git a/ChangeLog b/ChangeLog
index 6a6a274..bd8f205 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -2,7 +2,9 @@
 
 	* library/clock.tcl: Moved a tiny bit more of [clock format] from
 	run time to compile time, and fixed a l10n bug in the process.
-	[Bug 1371446]
+	[Bug 1371446]. Also, conditoned the call to SetupTimeZone to speed
+	the common case where TZData($timezone) already exists.
+	
 	* unix/Makefile.in: Made some changes to support a 'make' command
 	that is present on some antiquated versions of Solaris.
 	
diff --git a/library/clock.tcl b/library/clock.tcl
index 0c8bdaa..95924ae 100644
--- a/library/clock.tcl
+++ b/library/clock.tcl
@@ -13,7 +13,7 @@
 # See the file "license.terms" for information on usage and redistribution
 # of this file, and for a DISCLAIMER OF ALL WARRANTIES.
 #
-# RCS: @(#) $Id: clock.tcl,v 1.26 2005/12/02 16:58:13 kennykb Exp $
+# RCS: @(#) $Id: clock.tcl,v 1.27 2005/12/02 19:47:36 kennykb Exp $
 #
 #----------------------------------------------------------------------
 
@@ -652,6 +652,7 @@ proc ::tcl::clock::Initialize {} {
 
 proc ::tcl::clock::format { args } {
 
+    variable TZData
     set format {}
 
     # Check the count of args
@@ -724,9 +725,11 @@ proc ::tcl::clock::format { args } {
     if {$timezone eq ""} {
 	set timezone [GetSystemTimeZone]
     }
-    if {[catch {SetupTimeZone $timezone} retval opts]} {
-	dict unset opts -errorinfo
-	return -options $opts $retval
+    if {![info exists TZData($timezone)]} {
+	if {[catch {SetupTimeZone $timezone} retval opts]} {
+	    dict unset opts -errorinfo
+	    return -options $opts $retval
+	}
     }
     
     # Format the result
-- 
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