Originally Posted by
ajax
Yes, it usually makes sense to make it understandable to everyone.
Where I would like everyone to understand CET, BST and EST, usually it's much more useful to say "14:00 Frankfurt, 13:00 London, 8:00 New York" and everyone gets it.
Remember that, when you are dealing with east Asia and North America, you also have to specify the day: "6 p.m. Thursday San Jose, 9 a.m. Friday Shanghai." And saying "tomorrow" is dangerous when people have different ideas of what "today" is.