i dont know what a gmt is. could any1 tell me

Greenwich mean time. It's basically a time that people go off of, because theres an atomic clock there and stuff.

Greenwhich Mean Time, basically a system of which each part of the world is divided into it's time zones. Basically, if it's like noon is Australia, it's would be midnight in America or so, as they have a time zone difference, so when people are organizing an event, especially on the internet due to international players etc, that way everyone would know what time it is for them selves etc. Just search it up on Google if you still don't get it.