From what I gathered Zulu = UTC time, that is basically international time based on an atomic clock.
If precise seconds are not needed (We basically only need accuracy on the hours right?) you can consider Greenwich Mean Time an equal thing.
From there your timezone would be GMT -4 or 5 for the East coast of US, or GMT + 1 for my timezone, now I am not sure how many hours ahead Australia is according to GMT, but that is easy to figure out, in fact your Windows computer clock can tell you that, as it operates on UTC and I think it is like +10.
Anyways, I can make it at any time around 2100 GMT or UTC for anyone it may concern, I was fearing it was 2100 in Washington which places me at a fair disadvantage
As for the weekends, I can make any Window at Saturday, but I need some advance notification if it is nighttime UTC as I need to get some sleep first to change my day to match.