Extract timestamps properly when loading user institutions

htdocs/admin/users/edit.php

@@ -294,7 +294,7 @@ function edituser_institution_submit(Pieform $form, $values) {
                 $newuser = (object) array(
                     'usr'         => $user->id,
                     'institution' => $i->institution,
-                    'ctime'       => $i->ctime,
+                    'ctime'       => db_format_timestamp($i->ctime),
                     'studentid'   => $values[$i->institution . '_studentid'],
                     'staff'       => (int) ($values[$i->institution . '_staff'] == 'on'),
                     'admin'       => (int) ($values[$i->institution . '_admin'] == 'on'),

htdocs/lib/user.php

@@ -795,7 +795,7 @@ function load_user_institutions($userid) {
         throw new InvalidArgumentException("couldn't load institutions, no user id specified");
     }
     if ($institutions = get_records_sql_assoc('
-        SELECT u.institution,u.ctime,u.expiry,u.studentid,u.staff,u.admin,i.theme
+        SELECT u.institution,'.db_format_tsfield('ctime').','.db_format_tsfield('expiry').',u.studentid,u.staff,u.admin,i.theme
         FROM {usr_institution} u INNER JOIN {institution} i ON u.institution = i.name
         WHERE u.usr = ?', array($userid))) {
         return $institutions;