I've been attacking Rank 3's throughout. Better chance of a win, even if lower overall reward. Is server-time EST (so when it says it ends on the 29th at 01:00 it means 1 am EST?).

Edit: Went to the other thread and found this:

Originally Posted by YoshiEnVerde

Missions reset at 19 EST (Server Time), but the day is reset at 20 EST... Also, events tend to run up to 1 EST or 8 EST

Which makes me think that it does mean 1 am EST.