Index: wp-admin/includes/media.php
===================================================================
--- wp-admin/includes/media.php	(revision 17581)
+++ wp-admin/includes/media.php	(working copy)
@@ -1985,7 +1985,7 @@
 <div class="alignleft actions">
 <?php
 
-$arc_query = "SELECT DISTINCT YEAR(post_date) AS yyear, MONTH(post_date) AS mmonth FROM $wpdb->posts WHERE post_type = 'attachment' ORDER BY post_date DESC";
+$arc_query = apply_filters( 'media_upload_year_month_query', "SELECT DISTINCT YEAR(post_date) AS yyear, MONTH(post_date) AS mmonth FROM $wpdb->posts WHERE post_type = 'attachment' ORDER BY post_date DESC" );
 
 $arc_result = $wpdb->get_results( $arc_query );