I agree with Miriam. Staying up late is harmful to our health. competing in day is better than that in night. And I think the round will attract more good contestants if the time can be more proper. Thanks

Note that the rounds' time has to suit every interested party, including administrators and problem setters who must be present on the round and have no choice of skipping it and solving the problems later. In most cases these people are from time zones close to Moscow (admins certainly are), and moving the rounds earlier will conflict with their daily lives (work, studies etc.). For example, for me a round starting at 7:30 pm means that I just won't be able to get home in time to supervise it, unless it's Friday.

In other cases, like weekends when there is no work at daytime, Codeforces contests might conflict with other important contests. This weekend there is a round on 7:30 pm, and there are two non-Codeforces rounds earlier. There is not much point scheduling the contest at the same time as a more important one — people tend to complain even if there are two contests on the same day, let alone on the same time.

A perfect scheduling is impossible, especially with so many interested parties worldwide and so many other things going on.

As Codeforces becomes more and more international, organizers have to start switching times of competitions, as, for example, Topcoder does.

I think since such requests exist, sooner or later the problem will be solved.

Yes. It's too late to competition for me.