diff --git a/lam/lib/account.inc b/lam/lib/account.inc
index 0c39143f..9568b7cf 100644
--- a/lam/lib/account.inc
+++ b/lam/lib/account.inc
@@ -549,6 +549,9 @@ function get_preg($argument, $regexp) {
 		case 'date2':
 					$pregexpr = '/^((0[1-9])|([1-2][0-9])|30|31)\\.((0[1-9])|(1[0-2]))\\.[1-3][0-9][0-9][0-9]$/';
 					break;
+		case 'dateTime':
+					$pregexpr = '/^[1-3][0-9][0-9][0-9]\\-((0[1-9])|(1[0-2]))\\-((0[1-9])|([1-2][0-9])|30|31) ((0[0-9])|([1][0-9])|20|21|22|23):((0[0-9])|([1-5][0-9])):((0[0-9])|([1-5][0-9]))$/';
+					break;
 		case 'sambaLogonHours':
 					$pregexpr = '/^[0-9a-fA-F]{42}$/';
 					break;