4:00 am PST might be unsuitable for ET time zone
When planning a call between Pacific Standard Time and Eastern Time, you need to consider time difference between these time zones. PST is 4 hours behind of ET.
It is 4:00 am in PST. This does not fall within the span of usual working time between 1:00 pm and 6:00 pm in ET, but it still might be suitable to arrange a meeting, since it would be 8:00 am in ET, which is between 7:00 am and 11:00 pm ET time.