diff -r f507feede89a -r 09a1c134465b web/wp-admin/options-general.php
--- a/web/wp-admin/options-general.php	Wed Dec 19 12:35:13 2012 -0800
+++ b/web/wp-admin/options-general.php	Wed Dec 19 17:46:52 2012 -0800
@@ -20,10 +20,9 @@
 /**
  * Display JavaScript on the page.
  *
- * @package WordPress
- * @subpackage General_Settings_Screen
+ * @since 3.5.0
  */
-function add_js() {
+function options_general_add_js() {
 ?>
 <script type="text/javascript">
 //<![CDATA[
@@ -45,18 +44,18 @@
 		});
 		$("input[name='date_format_custom'], input[name='time_format_custom']").change( function() {
 			var format = $(this);
-			format.siblings('img').css('visibility','visible');
+			format.siblings('.spinner').css('display', 'inline-block'); // show(); can't be used here
 			$.post(ajaxurl, {
 					action: 'date_format_custom' == format.attr('name') ? 'date_format' : 'time_format',
 					date : format.val()
-				}, function(d) { format.siblings('img').css('visibility','hidden'); format.siblings('.example').text(d); } );
+				}, function(d) { format.siblings('.spinner').hide(); format.siblings('.example').text(d); } );
 		});
 	});
 //]]>
 </script>
 <?php
 }
-add_action('admin_head', 'add_js');
+add_action('admin_head', 'options_general_add_js');
 
 $options_help = '<p>' . __('The fields on this screen determine some of the basics of your site setup.') . '</p>' .
 	'<p>' . __('Most themes display the site title at the top of every page, in the title bar of the browser, and as the identifying name for syndicated feeds. The tagline is also displayed by many themes.') . '</p>';
@@ -231,12 +230,12 @@
 	<fieldset><legend class="screen-reader-text"><span><?php _e('Date Format') ?></span></legend>
 <?php
 
-	$date_formats = apply_filters( 'date_formats', array(
+	$date_formats = array_unique( apply_filters( 'date_formats', array(
 		__('F j, Y'),
 		'Y/m/d',
 		'm/d/Y',
 		'd/m/Y',
-	) );
+	) ) );
 
 	$custom = true;
 
@@ -251,7 +250,7 @@
 
 	echo '	<label><input type="radio" name="date_format" id="date_format_custom_radio" value="\c\u\s\t\o\m"';
 	checked( $custom );
-	echo '/> ' . __('Custom:') . ' </label><input type="text" name="date_format_custom" value="' . esc_attr( get_option('date_format') ) . '" class="small-text" /> <span class="example"> ' . date_i18n( get_option('date_format') ) . "</span> <img class='ajax-loading' src='" . esc_url( admin_url( 'images/wpspin_light.gif' ) ) . "' />\n";
+	echo '/> ' . __('Custom:') . ' </label><input type="text" name="date_format_custom" value="' . esc_attr( get_option('date_format') ) . '" class="small-text" /> <span class="example"> ' . date_i18n( get_option('date_format') ) . "</span> <span class='spinner'></span>\n";
 
 	echo "\t<p>" . __('<a href="http://codex.wordpress.org/Formatting_Date_and_Time">Documentation on date and time formatting</a>.') . "</p>\n";
 ?>
@@ -264,11 +263,11 @@
 	<fieldset><legend class="screen-reader-text"><span><?php _e('Time Format') ?></span></legend>
 <?php
 
-	$time_formats = apply_filters( 'time_formats', array(
+	$time_formats = array_unique( apply_filters( 'time_formats', array(
 		__('g:i a'),
 		'g:i A',
 		'H:i',
-	) );
+	) ) );
 
 	$custom = true;
 
@@ -283,7 +282,7 @@
 
 	echo '	<label><input type="radio" name="time_format" id="time_format_custom_radio" value="\c\u\s\t\o\m"';
 	checked( $custom );
-	echo '/> ' . __('Custom:') . ' </label><input type="text" name="time_format_custom" value="' . esc_attr( get_option('time_format') ) . '" class="small-text" /> <span class="example"> ' . date_i18n( get_option('time_format') ) . "</span> <img class='ajax-loading' src='" . esc_url( admin_url( 'images/wpspin_light.gif' ) ) . "' />\n";
+	echo '/> ' . __('Custom:') . ' </label><input type="text" name="time_format_custom" value="' . esc_attr( get_option('time_format') ) . '" class="small-text" /> <span class="example"> ' . date_i18n( get_option('time_format') ) . "</span> <span class='spinner'></span>\n";
 	;
 ?>
 	</fieldset>