From 73ff912a1fd8edfb65a5b594ebecfc531eef79fc Mon Sep 17 00:00:00 2001
From: pointsman <rolf@pointsman.de>
Date: Mon, 22 May 2023 12:17:44 +0000
Subject: Proposed fix for [af3ebc5fafe0].

---
 library/clock.tcl |  9 +++++++--
 tests/clock.test  | 18 ++++++++++++++++++
 2 files changed, 25 insertions(+), 2 deletions(-)

diff --git a/library/clock.tcl b/library/clock.tcl
index abe6c81..5dc724a 100644
--- a/library/clock.tcl
+++ b/library/clock.tcl
@@ -1173,7 +1173,7 @@ proc ::tcl::clock::ParseClockFormatFormat2 {format locale procName} {
 #
 #	Inputs a count of seconds since the Posix Epoch as a time of day.
 #
-# The 'clock format' command scans times of day on input.  Refer to the user
+# The 'clock scan' command scans times of day on input.  Refer to the user
 # documentation to see what it does.
 #
 #----------------------------------------------------------------------
@@ -1207,21 +1207,24 @@ proc ::tcl::clock::scan { args } {
     # Pick up command line options.
 
     foreach { flag value } [lreplace $args 0 0] {
-	set saw($flag) {}
 	switch -exact -- $flag {
 	    -b - -ba - -bas - -base {
 		set base $value
 	    }
 	    -f - -fo - -for - -form - -forma - -format {
+                set saw(-format) {}
 		set format $value
 	    }
 	    -g - -gm - -gmt {
+                set saw(-gmt) {}
 		set gmt $value
 	    }
 	    -l - -lo - -loc - -loca - -local - -locale {
+                set saw(-locale) {}
 		set locale [string tolower $value]
 	    }
 	    -t - -ti - -tim - -time - -timez - -timezo - -timezon - -timezone {
+                set saw(-timezone) {}
 		set timezone $value
 	    }
 	    default {
@@ -4261,6 +4264,7 @@ proc ::tcl::clock::add { clockval args } {
 	} else {
 	    switch -exact -- $a {
 		-g - -gm - -gmt {
+                    set saw(-gmt) {}
 		    set gmt $b
 		}
 		-l - -lo - -loc - -loca - -local - -locale {
@@ -4268,6 +4272,7 @@ proc ::tcl::clock::add { clockval args } {
 		}
 		-t - -ti - -tim - -time - -timez - -timezo - -timezon -
 		-timezone {
+                    set saw(-timezone) {}
 		    set timezone $b
 		}
 		default {
diff --git a/tests/clock.test b/tests/clock.test
index c30fea3..5ac70a6 100644
--- a/tests/clock.test
+++ b/tests/clock.test
@@ -36772,6 +36772,15 @@ test clock-57.1 {clock scan - abbreviated options} {
     clock scan 1970-01-01 -f %Y-%m-%d -g true
 } 0
 
+test clock-57.2 {clock scan - not -gmt and -timezone in the same call} {
+    catch {clock scan 1970-01-01 -format %Y-%m-%d -gmt true -timezone :Europe/Berlin}
+} 1
+
+# Bug af3ebc5fafe009
+test clock-57.3 {clock scan - not -g and -timezone in the same call} {
+    catch {clock scan 1970-01-01 -format %Y-%m-%d -gmt true -timezone :Europe/Berlin}
+} 1
+
 test clock-58.1 {clock l10n - Japanese localisation} {*}{
     -setup {
 	proc backslashify { string } {
@@ -36984,6 +36993,15 @@ test clock-65.1 {clock add, bad option [Bug 2481670]} {*}{
     -result {bad option "-foo"*}
 }
 
+test clock-65.2 {clock add with both -timezone and -gmt} {*}{
+    -body {
+	clock add 0 1 year -timezone :CET -gmt true
+    }
+    -match glob
+    -returnCodes error
+    -result {cannot use -gmt and -timezone in same call}
+}
+
 test clock-66.1 {clock scan, no date, never-before-seen timezone} {*}{
     -setup {
 	::tcl::clock::ClearCaches
-- 
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