Time error joomla1.5

asik bikin program ngalami error seperti contoh berikut setelah instal joomla1.5:

Warning: date() [function.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' instead in /home/webs/joomlagate/www/components/com_remository/p-classes/remositoryUser.php on line 90

Warning: date() [function.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' instead in /home/webs/joomlagate/www/components/com_remository/p-classes/remositoryFile.php on line 181

Warning: strtotime() [function.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 'Asia/Chongqing' for 'CST/8.0/no DST' instead in /home/webs/joomlagate/www/libraries/joomla/utilities/date.php on line 56

nggak perlu kawatir , langusung aja buka php.ini dan copykan syntak berikut:

[Date]
; Defines the default timezone used by the date functions
date.timezone = "Asia/ChongQing" 

kemudian restar Xampp kamu.