php date报错解决

最近买了个美国的虚拟服务器，正在装修中ing,在执行php -r "echo date('Ymd');"时，报

Notice: Use of undefined constant Ymd - assumed 'Ymd' in Command line code on line 1
PHP Warning: 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 'Asia/Chongqing' for
 'CST/8.0/no DST

查了一下，通过修改php.ini，问题解决.

wds@10.54.38.18>:# cat php.ini | grep "date.timezone"
;
;date.timezone =

将date.timezone注释去掉，然后date.timezone = Asia/Shanghai 问题解决.