Here is a good scripture to use on any JW or org on dates and if they have it figured out
1 Tim 1:4-7 4 nor to pay attention to false stories and to genealogies, which end up in nothing, but which furnish questions for research rather than a dispensing of anything by God in connection with faith. 5 Really the objective of this mandate is love out of a clean heart and out of a good conscience and out of faith without hypocrisy. 6 By deviating from these things certain ones have been turned aside into idle talk, 7 wanting to be teachers of law, but not perceiving either the things they are saying or the things about which they are making strong assertions.
abr