Default timezone is UTC not the servers local time

install/config/config.php

@@ -551,7 +551,7 @@ $config['compress_output'] = FALSE;
 | helper' page of the user guide for information regarding date handling.
 |
 */
-$config['time_reference'] = 'local';
+$config['time_reference'] = 'UTC';
 
 /*
 |--------------------------------------------------------------------------