[kroltan]

Fair enough, but please only use that with strictly USA audiences. (And remember that public information likely will not be targeted to strictly USA audiences)

Names don't carry any information intrinsically, they are only a reference to the actual information, and the offset information is pretty short, so why not just provide the information directly?

"X pm GMT-3" only requires the reader to know their own timezone offset, unlike "X pm Brasilia time" (which is inaccurately known as São Paulo time outside Brazil) or "X pm BRT", which requires the reader to both know what that timezone means, and their own (or, more likely, requires them to look the conversion up).

(And if the difference between GMT and UTC is significant, I hope it didn't take my comment to convince you about using offsets :> )