Index: wp-admin/includes/dashboard.php
===================================================================
--- wp-admin/includes/dashboard.php	(revision 20750)
+++ wp-admin/includes/dashboard.php	(working copy)
@@ -820,9 +820,8 @@
 			$text = __( '%1$s linked here saying, "%3$s"' );
 
 		if ( !empty($show_date) ) {
-			if ( !empty($show_author) || !empty($show_summary) )
-				/* translators: incoming links feed, %4$s is the date */
-				$text .= ' ' . __( 'on %4$s' );
+			/* translators: incoming links feed, %4$s is the date */
+			$text .= ' ' . __( 'on %4$s' );
 			$date = esc_html( strip_tags( $item->get_date() ) );
 			$date = strtotime( $date );
 			$date = gmdate( get_option( 'date_format' ), $date );