Mountain Standard Time (MST) is 7 hours behind Coordinated Universal Time (UTC). Queensland, Australia, is located in the Australian Eastern Standard Time (AEST) zone, which is 10 hours ahead of UTC.
Therefore, to find the time in Queensland when it is 7:00 PM MST, you can add 17 hours (7 hours difference between MST and UTC plus 10 hours for AEST).
7:00 PM MST + 17 hours = 12:00 AM AEST (next day)
So, when it is 7:00 PM MST in the US, it is 12:00 AM (midnight) the following day in Queensland, Australia.