diff --git a/htdocs/core/class/extrafields.class.php b/htdocs/core/class/extrafields.class.php
index 9400c64de85..48015547903 100644
--- a/htdocs/core/class/extrafields.class.php
+++ b/htdocs/core/class/extrafields.class.php
@@ -2103,7 +2103,7 @@ class ExtraFields
 				if (in_array($key_type, array('date','datetime')))
 				{
 					// Clean parameters
-					$value_key=dol_mktime($_POST[$keysuffix."options_".$key.$keyprefix."hour"], $_POST[$keysuffix."options_".$key.$keyprefix."min"], 0, $_POST[$keysuffix."options_".$key.$keyprefix."month"], $_POST[$keysuffix."options_".$key.$keyprefix."day"], $_POST[$keysuffix."options_".$key.$keyprefix."year"]);
+					$value_key=dol_mktime(GETPOST($keysuffix."options_".$key.$keyprefix."hour", 'int'), GETPOST($keysuffix."options_".$key.$keyprefix."min", 'int'), 0, GETPOST($keysuffix."options_".$key.$keyprefix."month", 'int'), GETPOST($keysuffix."options_".$key.$keyprefix."day", 'int'), GETPOST($keysuffix."options_".$key.$keyprefix."year", 'int'));
 				}
 				elseif (in_array($key_type, array('checkbox', 'chkbxlst')))
 				{