If everyone was on UTC and I want to schedule a meeting with my coworker across the country, I still need the application to tell me what time standard business hours are wherever he is located
So the developer still has to do the UTC->Localtime lookup.
Plus, when I travel, I have to keep a chart of local "human-time", so I know that when it's 03:00, it's time for lunch.
If everyone was on UTC and I want to schedule a meeting with my coworker across the country, I still need the application to tell me what time standard business hours are wherever he is located
So the developer still has to do the UTC->Localtime lookup.
Plus, when I travel, I have to keep a chart of local "human-time", so I know that when it's 03:00, it's time for lunch.