* finish task #6837.

module/search/config.php

@@ -1,3 +1,10 @@
 <?php
 $config->search = new stdclass();
 $config->search->groupItems = 3;
+
+$config->search->dynamic['$lastMonth'] = '$lastMonth';
+$config->search->dynamic['$thisMonth'] = '$thisMonth';
+$config->search->dynamic['$lastWeek']  = '$lastWeek';
+$config->search->dynamic['$thisWeek']  = '$thisWeek';
+$config->search->dynamic['$yesterday'] = '$yesterday';
+$config->search->dynamic['$today']     = '$today';

module/search/model.php

@@ -149,6 +149,7 @@ class searchModel extends model
             }
             else
             {
+                if($operator == 'between' and !isset($this->config->search->dynamic[$value])) $operator = '=';
                 $condition = $operator . ' ' . $this->dbh->quote($value) . ' ';
             }