I think all the tourneys should have UTC time as "oficial schedule". This time never changes and his own name says it's for everybody, it's UNIVERSAL. As most of tourneys (or all of them) are played by people from all over the world, UTC is the best.
Then, each one would have to deal with their own local daylight saving and so on, but UTC time would be inmmutable.
What I don't think it's right, it's to change the time of the tourneys according to a specific zone, even though those tourneys are held in that zone.
Of course, each tourney director is free to use the time they want to, but I'm talking about what I think it's best for all.