Tell him that they have had 3 major 1914 doctrines that they have changed when history proved them wrong.
- The "end times" were from 1799 - 1914 with Armageddon referring to a social collapse spanning 40 years from 1874 - 1914 and the Millennium starting on 1914. They had this doctrine from the 1870s to shortly after 1914.
- When that doctrine failed they said that the end times were from 1914 until the lifespan of the generation living then.
- When that generation almost died out they said that the generation referred to something else. Something incomprehensible.
Keep it brief and simple.