If you write UTC 22:00 with no +s it's gonna be that time for everyone, just go and check UTC time, that's the same time for everyone in the world. People would just google it and boom. Releasing a game at midnight saying 9 or 10 is already confusing by itself. UTC is the global time that's the same for everyone. If you got for GMT+6 on the 10 because it's midnight release but "OH wait it's gonna be GMT -5 of the 9 here" and so on it's overly complicated. We have UTC for exactly this kind of matters, and nobody uses it. (oh and yes UTC corresponds to GMT+0, but when you search for it, it's gonna give you the same time from anywhere in the world without doing the math in your brain yourself to figure it out). Plus there's always been a debate if midnight is the day after or before in the moment it ticks (besides for those that have been in the military which is the day after period), it's a shitty time to release a game XD if they didn't publish the map on the forums people would be still asking if it's gonna be the 11 or the 10 or the 9 for them. Still some people didn't see the map and are confused.