The reason that 1914 is so hard to explain is that the date was originally concocted by charlatan Charlie (Taze Russel) by measuring the length of some passages in the great pyramid and assuming that the numbers meant something. BTW the original guy that did the measuring had to come up with his own unit (pyramid inches) to make it all work. CTR taught that Jesus came in 1874 (invisibility) and that Armageddon would happen in 1914.
As every person in history has ever done Charlie died in 1916 and Rutherfraud did a hostile takeover of the corporate a$$ets. It was obvious by 1919 that Armageddon hadn’t taken place so he set 1925 as the date of the end. This date came and went as 100% of end world predictions fail and he needed a new plan. Thus in 1928 they denounced the pyramid scheme and came up with the times theory that many of us on this site tried to explain in the field ministry. They changed 1914 to the beginning of the last days and worked the 2520 years back to 607 bce even though Jerusalem was destroyed in 587 but who cares about historical accuracy at this point anyway.
It’s been 151 years since CTR started his religion in 1870.
The problem with end times cults is they have to keep changing the end times.