9:00 am EDT might be unsuitable for EST time zone
When planning a call between Eastern Daylight Time and Eastern Standard Time, you need to consider time difference between these time zones. EDT is 1 hour ahead of EST.
It is 9:00 am in EDT. This does not fall within the span of usual working time between 9:00 am and 5:00 pm in EST, but it still might be suitable to arrange a meeting, since it would be 8:00 am in EST, which is between 7:00 am and 11:00 pm EST time.