7:00 pm MDT might be unsuitable for CT time zone
When planning a call between Mountain Daylight Time and Central Time, you need to consider time difference between these time zones. MDT is 1 hour behind of CT.
It is 7:00 pm in MDT. This does not fall within the span of usual working time between 10:00 am and 6:00 pm in CT, but it still might be suitable to arrange a meeting, since it would be 8:00 pm in CT, which is between 7:00 am and 11:00 pm CT time.