PST is 1 hour behind of MST. If you are in PST, the most convenient time to accommodate all parties is between 9:00 am and 5:00 pm for a conference call or meeting. In MST, this will be a usual working time of between 10:00 am and 6:00 pm. ... This time span will be between 7:00 am and 11:00 pm MST time.