by 12am - 3 am do you mean 0-3 hrs (in the 24 hr format?). The times you suggested are pretty late and definitely not ideal for sunday, so friday is probably the best for me. I'll likely be playing in smogon tour that day so it depends on when I get knocked out, but i'm fine playing with u then, preferably on the earlier end of the timerame (6 pm - 2 am in gmt-4).
I can also play on friday 7pm~3am @gmt-3