if (node.get_property ("start", start_bbt)) {
if (string_to_bbt_time (start_bbt, bbt)) {
/* legacy session - start used to be in bbt*/
if (node.get_property ("start", start_bbt)) {
if (string_to_bbt_time (start_bbt, bbt)) {
/* legacy session - start used to be in bbt*/