Universal world time
>> In America? Well you will work 14:00-22:00 and have lunch at 18:00. <<
Doesn't that just change the problem?
Consider you're reading and the subject has breakfast at "15:00". Is that early, normal, late? It wouldn't be possible to tell unless you find out where the character is. So, does the time become "15:00 90degW"? That wouldn't seem to be a simplifcation.
Similarly, if you were to schedule a business meeting between UK and US colleagues, it might still be necessary to know whether all parties are likely to be awake and at work.
At least with the current system, once the time conversion is done, I can easily determine if it's a normal business hour, or not.
Just my 2p.