We do not see the Mountain time zone in the maintenance schedule in the AIOps. The day light savings time do not show up and the time is not adjusted with the daylight saving when the time zone is selected in the maintenance schedule.
Currently Eastern Daylight Time (EDT), UTC -4, as you can see the dropdown choices are UTC-5
Release : SAAS
Component : CA DOI Foundations - DEFAULT
Dev confirmed that the fix will be part of next SaaS Roll_out (Tentatively End of July)