Annual coral spawn

Any one know when the annual coral spawn occurs in central Indonesia?

It seems that there is very little information out there regarding spawn events in Indonesia. Singapore had a mass spawning coincidental with peak high tides in late summer a couple of years ago. Even on mailing lists of coral biologists you'll see the question asked often with no real answer given.

Wish I could help. Maybe frogfish or one of the other indonesian denizens may have a better idea.