Date is not safe to rely on the system's timezone settings

[Nadia]

You probably need to put the timezone in a configuration line in your php.ini file.

/usr/local/php/php.ini

You should have a block like this in your php.ini file:

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

If not, add it (replacing the timezone by yours). After configuring, make sure to restart httpd

service httpd restart