diff --git a/classes/UpgradeTools/CoreUpgrader/CoreUpgrader.php b/classes/UpgradeTools/CoreUpgrader/CoreUpgrader.php
index 92721a3ee..0ad5051e2 100644
--- a/classes/UpgradeTools/CoreUpgrader/CoreUpgrader.php
+++ b/classes/UpgradeTools/CoreUpgrader/CoreUpgrader.php
@@ -234,10 +234,6 @@ protected function initConstants(): void
         if (!defined('_PS_INSTALLER_PHP_UPGRADE_DIR_')) {
             define('_PS_INSTALLER_PHP_UPGRADE_DIR_', $this->pathToUpgradeScripts . 'php/');
         }
-        if (function_exists('date_default_timezone_set')) {
-            date_default_timezone_set('Europe/Paris');
-        }
-
         // if _PS_ROOT_DIR_ is defined, use it instead of "guessing" the module dir.
         if (defined('_PS_ROOT_DIR_') && !defined('_PS_MODULE_DIR_')) {
             define('_PS_MODULE_DIR_', _PS_ROOT_DIR_ . '/modules/');