Ok I worked out how to change to a Day race instead of a night race(default schedule) in edit schedule in the AUS shedules race calendar lot scroll down to 5th Nov click on the moon to the right of the Flemington name also on the same day just above it on the USA Breeders Cup event day change the moon icon change it to the bight sun instead of moon(meaning night to day) and save the file to the custom name in the top right corner then start with that custom schedule and the time of the BC & MC day should be changed when you check the schedule book in the season menu!.

IMPORTANT! don't change anything else if done properly should not CTD as at present from my testing I think there is issues with schedule edit when attempting to do other things like add races or Prep races or Nationality spread.

note; Do so only if you rather a Day Melbourne cup race instead of a Night Breeders Cup meeting. Hope this helps cheers.