php date(): It is not safe 警告解决

 升级php版本从PHP5.2.17 到 PHP 5.3.21 后出现如下保存
 
 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. …

解决办法

 在程序中使用

 date_default_timezone_set('PRC');

 或者在php.ini里找到date.timezone这行，把值改成PRC，如date.timezone = PRC。如果没有这一行直接加上就好

 
 [Date]
; Defines the default timezone used by the date functions
; http://php.net/date.timezone
date.timezone = America/New_York