diff --git a/src/wp-admin/includes/revision.php b/src/wp-admin/includes/revision.php
index ae9f93a4f7..9219f68f8d 100644
--- a/src/wp-admin/includes/revision.php
+++ b/src/wp-admin/includes/revision.php
@@ -221,8 +221,8 @@ function wp_prepare_revisions_for_js( $post, $selected_revision_id, $from = null
 			'id'         => $post->ID,
 			'title'      => get_the_title( $post->ID ),
 			'author'     => $authors[ $post->post_author ],
-			'date'       => date_i18n( __( 'M j, Y @ G:i' ), strtotime( $post->modified ) ),
-			'dateShort'  => date_i18n( _x( 'j M @ G:i', 'revision date short format' ), strtotime( $post->modified ) ),
+			'date'       => date_i18n( __( 'M j, Y @ G:i' ), strtotime( $post->post_modified ) ),
+			'dateShort'  => date_i18n( _x( 'j M @ G:i', 'revision date short format' ), strtotime( $post->post_modified ) ),
 			'timeAgo'    => sprintf( __( '%s ago' ), human_time_diff( strtotime( $post->post_modified_gmt ), $now_gmt ) ),
 			'autosave'   => false,
 			'current'    => true,