cakephpで『strtotime() [http://php.net/function.strtotime]: It is not safe to rely on the system’s timezone settings.』と表示されたら

cakephpここで下記のようなエラーが表示されたら

Warning (2): strtotime() [http://php.net/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/Tokyo' for 'JST/9.0/no DST' instead [CORE/cake/libs/cache.php, line 597] Notice: Trying to get property of non-object in /var/www/domain/hoge.info/cakephp/cake/libs/cache/file.php on line 248 Fatal error: Call to a member function cd() on a non-object in /var/www/domain/hoge.info/cakephp/cake/libs/cache/file.php on line 248

上記指摘通り、

app/config/core.phpの下記をチェック!

//date_default_timezone_set('UTC');

コメントアウトをはずしてみると動きました。。