diff --git a/core/modules/system/system.admin.inc b/core/modules/system/system.admin.inc
index 3a07fa2..61704eb 100644
--- a/core/modules/system/system.admin.inc
+++ b/core/modules/system/system.admin.inc
@@ -1979,7 +1979,7 @@ function system_date_time_settings() {
 
       $choices = array();
       foreach ($formats as $f => $format) {
-        $choices[$f] = format_date(REQUEST_TIME, 'custom', $f);
+        $choices[$f] = format_date(-1, 'custom', $f);
       }
       reset($formats);
       $default = variable_get('date_format_' . $type, key($formats));
@@ -2086,7 +2086,7 @@ function system_add_date_format_type_form($form, &$form_state) {
   }
   $choices = array();
   foreach ($formats as $f => $format) {
-    $choices[$f] = format_date(REQUEST_TIME, 'custom', $f);
+    $choices[$f] = format_date(-1, 'custom', $f);
   }
   // Show date format select list.
   $form['date_format'] = array(
@@ -2667,7 +2667,7 @@ function system_date_delete_format_form($form, &$form_state, $dfid) {
   $format = system_get_date_format($dfid);
 
   $output = confirm_form($form,
-    t('Are you sure you want to remove the format %format?', array('%format' => format_date(REQUEST_TIME, 'custom', $format->format))),
+    t('Are you sure you want to remove the format %format?', array('%format' => format_date(-1, 'custom', $format->format))),
     'admin/config/regional/date-time/formats',
     t('This action cannot be undone.'),
     t('Remove'), t('Cancel'),
@@ -2684,7 +2684,7 @@ function system_date_delete_format_form_submit($form, &$form_state) {
   if ($form_state['values']['confirm']) {
     $format = system_get_date_format($form_state['values']['dfid']);
     system_date_format_delete($form_state['values']['dfid']);
-    drupal_set_message(t('Removed date format %format.', array('%format' => format_date(REQUEST_TIME, 'custom', $format->format))));
+    drupal_set_message(t('Removed date format %format.', array('%format' => format_date(-1, 'custom', $format->format))));
     $form_state['redirect'] = 'admin/config/regional/date-time/formats';
   }
 }
@@ -2735,7 +2735,7 @@ function system_date_time_formats() {
   if (!empty($formats)) {
     foreach ($formats as $format) {
       $row = array();
-      $row[] = array('data' => format_date(REQUEST_TIME, 'custom', $format['format']));
+      $row[] = array('data' => format_date(-1, 'custom', $format['format']));
       $links = array();
       $links['edit'] = array(
         'title' => t('edit'),
@@ -2777,7 +2777,7 @@ function system_configure_date_formats_form($form, &$form_state, $dfid = 0) {
     $format = system_get_date_format($dfid);
   }
 
-  $now = ($dfid ? t('Displayed as %date', array('%date' => format_date(REQUEST_TIME, 'custom', $format->format))) : '');
+  $example = ($dfid ? t('Displayed as %date', array('%date' => format_date(-1, 'custom', $format->format))) : '');
 
   $form['date_format'] = array(
     '#type' => 'textfield',
@@ -2785,7 +2785,7 @@ function system_configure_date_formats_form($form, &$form_state, $dfid = 0) {
     '#maxlength' => 100,
     '#description' => t('A user-defined date format. See the <a href="@url">PHP manual</a> for available options.', array('@url' => 'http://php.net/manual/function.date.php')),
     '#default_value' => ($dfid ? $format->format : ''),
-    '#field_suffix' => ' <small id="edit-date-format-suffix">' . $now . '</small>',
+    '#field_suffix' => ' <small id="edit-date-format-suffix">' . $example . '</small>',
     '#ajax' => array(
       'callback' => 'system_date_time_lookup',
       'event' => 'keyup',
@@ -2902,7 +2902,7 @@ function system_date_format_localize_form($form, &$form_state, $langcode) {
   $choices = array();
   foreach ($formats as $type => $list) {
     foreach ($list as $f => $format) {
-      $choices[$f] = format_date(REQUEST_TIME, 'custom', $f);
+      $choices[$f] = format_date(-1, 'custom', $f);
     }
   }
   reset($formats);
@@ -2943,7 +2943,7 @@ function system_date_format_localize_form($form, &$form_state, $langcode) {
 function system_date_time_lookup($form, &$form_state) {
   $format = '';
   if (!empty($form_state['values']['date_format'])) {
-    $format = t('Displayed as %date_format', array('%date_format' => format_date(REQUEST_TIME, 'custom', $form_state['values']['date_format'])));
+    $format = t('Displayed as %date_format', array('%date_format' => format_date(-1, 'custom', $form_state['values']['date_format'])));
   }
   // Return a command instead of a string, since the Ajax framework
   // automatically prepends an additional empty DIV element for a string, which