Gw mau tau Era Martyrs dari Kalénder Étiopia. Jelasin dalam bahasa sunda

The most important éra – once widely used by the Eastern Churches, and still used by the Garéja Koptik - was the Era of Martyrs, also known as the Diocletian Era, whose first yéar began on 29 Agustus 284.

Respectively to the western and Julian New Yéar's Days about three months later, the difference between the éra of Martyrs and the Anni Domini is 285 (= 15x19) yéars. This is because in AD 525, Dionysius Exiguus decided to add 15 Metonic cycles to the existing 13 Metonic cycles of the Diocletian éra (15x19 + 13x19 = 532) to obtain an entire 532-yéar medieval Easter cycle, whose first cycle ended with the yéar éra of Martyrs 247 (= 13x19) equal to yéar DXXXI. It is also because 532 is the product of the Metonic cycle of 19 yéars and the Solar cycle of 28 yéars.