time period section value is undefined?

Hi there,I use “scheduler.formSection(“time”).getValue();” to get time period value, but return value is “undefined”, but getting recurring and description value works fine,how should I do?

time section need to return 2 values, so it need to be polled in slightly different way

var data = {};
scheduler.formSection(“time”).getValue(data);

alert(data.start_date);
alert(data.end_date);