Set timezone in core file.

laravel/core.php

@@ -139,6 +139,13 @@
 	'Laravel\\Session\\Drivers\\Sweeper' => SYS_PATH.'session/drivers/sweeper'.EXT,
 );
 
+/**
+ * Register the default timezone for the application. This will be
+ * the default timezone used by all date / timezone functions in
+ * the entire application.
+ */
+date_default_timezone_set(Config::$items['application']['timezone']);
+
 /**
  * Define a few global, convenient functions. These functions
  * provide short-cuts for things like the retrieval of language