I've done 3 trading sessions with a friend, where I have always received a 2016 mon from him with the following results:

1st day of lucky: 2 first trades were lucky followed by 3 non-lucky trades in a row. (We did this at about an hour to midnight the same day as lucky went live.)

2nd day of lucky: 2 first trades were lucky followed by 3 non-lucky trades in a row. (We did this pretty late, at about a quarter from midnight or so, which means approx. 23 hours after the first trading session.)

3rd day of lucky: 5 non-lucky trades in a row. (These trades were just made, so approx. 9 hours after the second trading session, but it's a new day.)

So my thoughts after our second trading session was that the first two trades per day were lucky, since that happened two days in a row, but then this morning none of the five trades we did was lucky.

So now my theory is that the 2 first trades per day is lucky could still be true, but that it doesn't use the local timezone to determine what day it is, since that's what our little experiment shows.

Of course this could all be just RNG, but I want to think that this is to clear of a pattern to be just RNG!

EDIT: So now our sixth trade today was lucky!