roundcubemail 界面无法登陆，提示：您的浏览器不接受Cookie
roundcubemail 版本：0.3
php:5.3
mysql:5.1
错误日志：
[22-Oct-2009 21:36:44] PHP Warning:  include(): It is not safe to rely on the system's timezone settings. You are *required* to use the date.timezone setting or the date_default_timezone_set() function. In case you used any of those methods and you are still getting this warning, you most likely misspelled the timezone identifier. We selected 'Asia/Chongqing' for 'CST/8.0/no DST' instead in /var/www/html/webmail/program/lib/MDB2.php on line 392
哪位可以帮忙解释一下了，谢谢！