Geological Time By Lpyaperson Period: 4250 BCE to 2020 Meghalayan Age Period: 4249 BCE to 2152 BCE Lowhistoric Subage Period: 2151 BCE to 27 BCE Midhistoric Subage Period: 26 BCE to 2020 Highhistoric Subage Period: 25 BCE to 476 Romanic Period Period: 477 to 1492 Medieval Period Period: 1493 to 2020 Modern Period Period: 1494 to 1776 Colonial Subperiod Period: 1777 to 2020 Modern Subperiod Period: 1778 to 1865 Washingtonic Centipoch Period: 1866 to 1945 Lincolnic Centipoch Period: 1946 to 2020 Modern Centipoch Period: Jan 1, 1946 to Jan 20, 1989 Reaganic Subcentipoch Period: Jan 2, 1946 to Sep 11, 1955 Posthitlerian Millipoch Period: Sep 12, 1955 to Apr 4, 1968 Martinian Millipoch Period: Apr 5, 1968 to Jan 20, 1981 Carterian Millipoch Period: Jan 21, 1981 to Jan 20, 1989 Reaganic Millipoch Period: Jan 21, 1989 to Dec 31, 2020 Millenial Subcentipoch Period: Jan 22, 1989 to Jan 20, 2001 Clintonic Millipoch Period: Jan 21, 2001 to Nov 20, 2008 Seconbushic Millipoch Period: Nov 21, 2008 to Dec 31, 2020 Obamian Millipoch