BA/AA

BA/AA is system of years counting. AA means after apocalypse, and BA-before apocapypse.
 * 0-2016 BA
 * 1914-102 BA
 * 1916-100 BA
 * 2003-13 BA
 * 2006-10 BA
 * 2016-0
 * 2017-1 AA
 * 2018-2 AA
 * 2020-4 AA
 * 2116-100 AA