Title says it all! I’ll be controlling Ground and Tower feel free to join.
You need the appropriate format for your title. And time in Zulu
Edited to fit theoretical title format. Remember that GMT is the same thing as Zulu and UTC.
It is probably better practice to use UTC / Zulu rather than GMT, regardless if they share the same time, just based on the fact this is a simulation of real methods used in aviation. Whenever you’re submitting flight plans you’ll be required to do so in UTC (GMT will never be mentioned).