Allow me to try. It has to do with the 3 1/2 year period. If you want scriptures and references, I will have to look it up. The "seven times" end in the fall of 1914.
First line of evidence then is the "time, times, and half a time" of Dan. and Rev. This amounts to 3 1/2 years, which start at the end of the year 1914, concluding in 1919. Second line of evidence is Jesus' second inspection of the temple. He did this at the end of his earthly ministry. If he became king in 1914 he would have inspected the temple then for the first time. Second time would be in 1919, according to "time, times and half a time" = 3 1/2 years.
Here they also use the "two witnesses" in Revelation. problem with this is the "two witnesses" would be killed by the beast from the abyss, which they later identify as the League and the UN. However the League would only be created after the death of the "two witnesses." How can they be killed by an entity that did not exist?