PHPのバージョンを上げるとアクセス不可

（PHP5.1？→PHP5.4.22）

以下アクセス時に表示されたエラー

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 the timezone 'UTC' for now, but please set date.timezone to select your timezone. in /www/xxx/freo/libs/freo/internals/default/default.php on line 117

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 the timezone 'UTC' for now, but please set date.timezone to select your timezone. in /www/xxx/freo/libs/freo/internals/default/default.php on line 118

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 the timezone 'UTC' for now, but please set date.timezone to select your timezone. in /www/xxx/freo/libs/freo/internals/default/default.php on line 260

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 the timezone 'UTC' for now, but please set date.timezone to select your timezone. in /www/xxx/freo/libs/freo/internals/default/default.php on line 261

◆改善方法（sakuraサーバの場合）

サーバコントロールパネル＞アプリケーションの設定＞PHP設定の編集＞php.ini 設定ファイル編集

date.timezone = "Asia/Tokyo"

を追記にて改善