运行得到错误：SYSTEM WARNING: date_default_timezone_get() [function.date-default-timezone-get]: 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 'America/New_York' for '-4.0/DST' instead
修改 config_inc.php 文件，
添加下面的内容：$g_default_timezone = 'UTC';就可以避免这个错误了。