Sorry about the delay on this.
Yes, we are aware of the early change for Perth and we do have the updated timezone information on the server and the guide data has been updated accordingly.
The good news as well is that for computers that should automatically adjust for daylight savings times the timezone should change correctly (the other states though may have some issues) as the change back is the normally scheduled time, so for set top boxes just change the timezone back as normal and computers should automatically adjust.