TAC, it is obvious now what your problem was on the other thread; you have a very restrictive definition of latest divert time.
May I suggest that the definition offerred by SM4 Pirate
As an ATC I am expecting that you will leave hold at that time and either proceed to destination or divert to alternate.
is closer to the one held by most pilots, i.e. it is a PNR time, and has nothing to do with being at the minima.