On the ISS, the timezone used is UTC. Thus it is reasonnable to assume that all nations implied in the ISS program use UTC for all their space programs to ease ground crew's work while they may work on several space programs. But what about the other nations with space program?
EDIT: When asking for other nation with space program, I was expecting answer including nation from the linked wikipedia list not involved in the ISS space program (e.g. India, North Corea, ...)