There are two important elements to the WTS's setting of dates one that in doing so they made themselves apostate false prophets as Jesus condemned his faithful followers to set a time upon god's own sacred time, also that not even he did not know of the time.
The other is these date setting were devised to be advantageous toward proliferating the literature the WTS published.
Besides the chronological date setting the WTS used to create 1914 is false for its well supported in the bible and secular knowledge that ancient Jerusalem did not fall in 607 BCE.