bonjour depuis que j'ai migrer sur php 5.4 j'ai plein de code d'erreur qui saffiche et je ne peux pas revenir a la version 5.2 si vous pouvez m'aider

Strict Standards: 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 'Europe/Berlin' for 'CEST/2.0/DST' instead in /homepages/0/d414357358/htdocs/photographie/admin/intro.php on line 116

Strict Standards: DateTime::__construct(): 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 'Europe/Berlin' for 'CEST/2.0/DST' instead in /homepages/0/d414357358/htdocs/photographie/include/functions.inc.php on line 578

Warning: Cannot modify header information - headers already sent by (output started at /homepages/0/d414357358/htdocs/photographie/admin/intro.php:116) in /homepages/0/d414357358/htdocs/photographie/include/page_header.php on line 101

voila en gros se que sa m'affiche