Index: wp-admin/update-core.php
===================================================================
--- wp-admin/update-core.php	(revision 15771)
+++ wp-admin/update-core.php	(working copy)
@@ -110,7 +110,7 @@
  *
  * @return null
  */
-function core_upgrade_preamble() {
+function core_upgrade_preamble($checked_time) {
 	global $upgrade_error;
 
 	$updates = get_core_updates();
@@ -138,6 +138,9 @@
 		_e( 'An updated version of WordPress is available.' );
 		echo '</h3>';
 	}
+	echo '<em>';
+	echo sprintf(__('Last checked at %s'), $checked_time);
+	echo '</em>';
 
 	echo '<ul class="core-updates">';
 	$alternate = true;
@@ -391,9 +394,11 @@
 );
 
 if ( 'upgrade-core' == $action ) {
-	wp_version_check();
+	$version_check_result = wp_version_check();
+	if ( null == $version_check_result || false == $version_check_result || true == $version_check_result )
+		$checked_time = current_time('mysql');
 	require_once('./admin-header.php');
-	core_upgrade_preamble();
+	core_upgrade_preamble($checked_time);
 } elseif ( 'do-core-upgrade' == $action || 'do-core-reinstall' == $action ) {
 	check_admin_referer('upgrade-core');