Actually, I was in a bit of a hurry, and I think I gave you bad information on the safe harbor piece. The deadline for the safe harbor piece is indeed 12/31/2016, to preserve the safe harbor status of the plan. However, for 415 purposes, since made after the 415 deadline discussed earlier, it is ALLOCATED for 2016, same as the profit sharing. Still only one deadline for 415 purposes. There are some limited exceptions to the otherwise applicable 415 deadlines, but this isn't one of them.
Prior to the 2007 415 regulations, I seem to recall that the 12/31 deadline was used for 415 purposes as well (which frankly made sense) but the final 415 regulations didn't provides this carve out.
Sorry about that.