One other aspect relating to Jan 20th 2019 is that it will be the second Anniversary of Trump's Presidency , as he took office Jan 20, 2017. His term is 4 years so he is nearing halfway of his term.

 Revelation 17 v. 10 indicates that the seventh King will serve a "short space" , and if this king is Trump as some have speculated , then the "shorter" portion of his term will conclude on the 20th.