Unlike Mormons (Joseph Smith etc), the WTBTS has never claimed to be a "prophet". They only claim that they try to interpret prophecy left by others in the bible. Therefore, these dates should not ever be viewed as "prophecy's unfulfilled" but rather "failed interpretation". There is a huge difference between those statements.
johnnyc:
I will submit to you that you haven't done ENOUGH reading of Apostate literature, if your comment above reflects your true feelings.
-LWT