One simple solution would be to add shortened time zone suffixes to each and every time/date stamp. 

For context: Zoho Bookings will allow the company to default to the customer's time zone (which is great), however, if/when integrated to the Zoho CRM, the company cannot quickly/clearly verify time zone. 

To complicate matters, if a staff member in New York books for a meeting type defaulted to Chicago, the meeting is created in Eastern TZ, not Central. 

To complicate matters even further, when trying to rely on Zoho Calendar to sort out issues, the calendar details do not specify (you must make two clicks to see relevant originating TZ info), AND the calendar itself has a TZ column to the left of the calendar view, but EVEN IT doesn't clearly communicate TZ data. One must first know how to read (-4:00 GMT) style tags, which adds yet another layer of difficulty to employee onboarding orientation.

This example of incongruence wouldn't be so bad, but NONE of the apps seem to show/display/select TZ information even remotely like the others. Why?