4:00 am PT is not suitable to schedule meetings
When planning a call between Pacific Time and Mountain Daylight Time, you need to consider time difference between these time zones. PT is 1 hour behind of MDT.
It is currently 4:00 am in PT, which is not a suitable time to arrange a call or meeting with someone in MDT, since it is 5:00 am there, which not within the optimal time span between 7:00 am and 11:00 pm.
You could, however, schedule a call between 6:00 am and 10:00 pm your time. This time span will be between 7:00 am and 11:00 pm in MDT.