diff --git a/lam/lib/account.inc b/lam/lib/account.inc
index ac4f3aa7..dc802ba5 100644
--- a/lam/lib/account.inc
+++ b/lam/lib/account.inc
@@ -489,7 +489,7 @@ function get_preg($argument, $regexp) {
 					$pregexpr = '/^[0-9a-fA-F]{2}(:[0-9a-fA-F]{2}){5}$/';
 					break;
 		case 'date':
-					$pregexpr = '/^((0[1-9])|([1-2][0-9])|30|31)\\-((0[1-9])|(1[1-2]))\\-[1-3][0-9][0-9][0-9]$/';
+					$pregexpr = '/^((0[1-9])|([1-2][0-9])|30|31)\\-((0[1-9])|(1[0-2]))\\-[1-3][0-9][0-9][0-9]$/';
 					break;
 	}
 	if ($pregexpr!='')