diff --git a/rich_snippets.install b/rich_snippets.install
index 7371b6a..7f5a523 100644
--- a/rich_snippets.install
+++ b/rich_snippets.install
@@ -9,8 +9,8 @@
  * Implements hook_install().
  */
 function rich_snippets_install() {
-  variable_set('date_format_rich_snippets_published_date', 'M t, Y');
-  variable_set('date_format_rich_snippets_event_date', 'D, M t, Y');
+  variable_set('date_format_rich_snippets_published_date', 'M j, Y');
+  variable_set('date_format_rich_snippets_event_date', 'D, M j, Y');
 }
 
 /**