If I remember correctly they couldn't even get the date of the death of CT Russell correct. This error necessitated a revision in the "Revelation It's Grand-Climax" book.
"RELIGIOUS LEADERS sometimes predict tragic worldwide events to warn mankind and gather followers. Doomsday prophet Harold Camping and his disciples widely advertised that the earth would be destroyed in 2011. Needless to say, the world is still here." Watchtower 2014 May 1 p.3
Camping made a prediction that Judgement day would occur on May 21, 2011 and the End of the World on October 21, 2011.
Interesting that Watchtower would knock these particular predictions given their own connection to the dates.
At the time of May 2011 permission was granted for criminal charges to be laid against the "faithful and discreet slave class" in a court in Victoria, Australia. Judgment Day indeed. The charges were filed on July 26, 2011. July 26 is now Watchtower memorial day. The charges were in relation to non-compliance with mandatory child protection laws. This action led to the current Australian Child Abuse Royal Commission into Jehovah's Witnesses.
At the time of October 2011 the "faithful and discreet slave class" ceased to exist and was replaced by the governing body. The death stroke occurred in a court in Victoria, Australia. End of the World indeed.
I predict that one day dates will mean nothing.