The sign that Jesus gave
Jesus actually condemned and admonished his followers upon setting a time god's own sacred time but I guess the leaders of the Watchtower Corporation didn't accept that instruction and guidance by Jesus in preaching his Gospel.
The WTS/JWS have been involved in unscriptural apostate false prophesying for over 100 years.
The leaders of the WTS/JWS (GB) had consumed themselves into their literature publishing and proliferation agenda diverging away from accurate bible interpretation and adherence, they essentially turned themselves into sinning apostate false prophets and lured others into being the same.