diff --git a/public_html/core.php b/public_html/core.php
index 7ec52061..923fcea7 100644
--- a/public_html/core.php
+++ b/public_html/core.php
@@ -39,6 +39,9 @@ define('LS_TMP_DIR', 'tmp/');
 define('LS_TEXT_DOMAIN', 'ldapsaisie');
 define('LS_I18N_DIR', 'lang');
 
+// Timezone
+date_default_timezone_set('UTC');
+
 require_once LS_INCLUDE_DIR.'functions.php';
 
 require_once LS_CLASS_DIR.'class.LSsession.php';