Index: wp-admin/options-general.php
===================================================================
--- wp-admin/options-general.php	(revision 11664)
+++ wp-admin/options-general.php	(working copy)
@@ -104,7 +104,7 @@
 <?php
 $current_offset = get_option('gmt_offset');
 $offset_range = array (-12, -11.5, -11, -10.5, -10, -9.5, -9, -8.5, -8, -7.5, -7, -6.5, -6, -5.5, -5, -4.5, -4, -3.5, -3, -2.5, -2, -1.5, -1, -0.5,
-	0, 0.5, 1, 1.5, 2, 2.5, 3, 3.5, 4, 4.5, 5, 5.5, 5.75, 6, 6.5, 7, 7.5, 8, 8.5, 8.75, 9, 9.5, 10, 10.5, 11, 11.5, 12, 12.75, 13, 13.75, 14);
+	0, 0.5, 1, 1.5, 2, 2.5, 3, 3.5, 4, 4.5, 5, 5.5, 5.75, 5.83, 6, 6.5, 6.83, 7, 7.5, 8, 8.5, 8.75, 9, 9.5, 10, 10.5, 11, 11.5, 12, 12.75, 13, 13.75, 14);
 foreach ( $offset_range as $offset ) {
 	if ( 0 < $offset )
 		$offset_name = '+' . $offset;
@@ -113,7 +113,7 @@
 	else
 		$offset_name = (string) $offset;
 
-	$offset_name = str_replace(array('.25','.5','.75'), array(':15',':30',':45'), $offset_name);
+	$offset_name = str_replace(array('.25','.5','.75','.83'), array(':15',':30',':45',':50'), $offset_name);
 
 	$selected = '';
 	if ( $current_offset == $offset ) {