小花日期警告消息

我的站点管理面板通过Kohana编码。当单击"公司->新增"时，遇到问题：

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panel/application/controllers/admin/corporate/news.php [82]:
date() [function.date]: 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 'Europe/Helsinki' for 'EEST/3.0/DST' instead

和堆栈跟踪：

panel/application/controllers/admin/corporate/news.php [82]:
date( Y-m-d, 1336401401 )
News_Controller->add(  )

82.行：

$dbForm->date->value = date('Y-m-d',time());

什么问题？谢谢。