There are palatable reasons why the majority of Christian based faiths do not make these kind of prolific doctrines as to when the GT and Armageddon is to arrive but rather teach to devoted faithful followers to be prepared every day of their lives !
Fear mongering charlatans have been selling Armageddon and the rapture since the 19th century and the Watchtower Corporation can recognizably fit into this group..
These personal endeavors have accumulated in acquiring both a great amount of money and power to these mostly men.
The words of Jesus Christ spelled out what would happen to false prophets when he does return, that's a scriptural backed doctrine that never gets acknowledged by the WTS, particularly posed with reflection onto themselves.