Welcome to Smogon! Take a moment to read the Introduction to Smogon for a run-down on everything Smogon, and make sure you take some time to read the global rules.
Next Saturday will be good, which I believe will be your Sunday I'm GMT-7 myself, I believe 4pm GMT+9 is around Midnight. The night of Saturday for me is like 4PM sunday for you if I did the right math.
So uh irl things came up and I won't be available on Sunday anymore. Would you like to play next week instead? Does 12am your time work on weekdays (except Tuesday?)