Disclaimer: I am not a mekubal nor a Rebbeh.
I just saw a Zohar (maybe in Tikkunim) which says that anybody who is mechashev the ketz is foolish, because Hashem never revealed it.
I was very puzzled, because the Zohar itself, elsewhere, does give an exact date (which unfortunately has passed). I forget it now, (although I may have once posted it on YW) but I think it was 5480.