The market is generally open Monday to Friday from 21.30 - 04:00 WIB or 20:30 - 03:00 WIB during Daylight Saving except for US public holidays. You can easily see if the market is open on your Gotrade home screen - this will be indicted on the Home screen of the app, with the US Markets flashing "Live" (instead of "Last close" for when the market is not open).