Cacti编译安装错误: Warning: strtotime(): It is not safe to rely on the system's timezone settings.

环境: LAMP

php解析正常, 将cacti的目录解压并放到/usr/local/apache/htdocs/cacti以后, 导入cacti.sql到mysql的cacti数据库, 浏览器输入网址: http:/ip/cacti, 出现如下错误:

Warning: strtotime(): 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 the timezone 'UTC' for now, but please set date.timezone to select your timezone. in /usr/local/apache/htdocs/cacti/include/global_constants.php on line

Google搜索到, 在出现问题的php里面, 添加如下项: 如/usr/local/apache/htdocs/cacti/include/global_constants.php

if( ! ini_get('date.timezone') )
{
    date_default_timezone_set('Asia/Chongqing');
}

有说在php.ini里面, 修改date.timezone = "Asia/chongqing", 但实际中并没起到作用, 因此可以试试上述的方法.