Tarquenian calendar

The Tarquenian calendar is the standard method used to reckon time among most of Achuirea’s human inhabitants, as well as in certain other parts of the world (such as Vhaluzia). It is named after the prophet Tarquenus, who decreed its use when the People of the Ten Thousand Ships safely reached Achuirean shores.
Like the Vathanalu Reckoning used in Orithea, the Tarquenian calendar uses the 364-day lunisolar year with 13 lunar months of 28 days each; however, the Tarquenian system numbers the years from the arrival of the People of the Ships on Achuirean soil after the Schism Wars over five millennia ago, meaning the current Tarquenian year is 5106 SAJ (Sanu Akhuira-Jannu, meaning “year of refuge in Achuirea” in old Chomarra). The Tarquenian calendar also lacks a year zero; the year the exiles reached Achuirea was 1 SAJ, and the year before that was -1 SAJ. 
Furthermore, whereas the Vathanalu calendar starts the new year after the winter solstice, the Tarquenian system reckons each new year as beginning on the supposed date the exiles made landfall, in early summer, specifically forty days before midsummer. It should be noted that this date of arrival is considered conjectural by scholars, and is derived from ancient and legendary accounts of the exile; it should be seen as a traditional belief rather than a historical fact. 
In fact, even the number of years that have actually passed since the arrival of the exiles in Achuirea is not definitively known, and in the past, different Achuirean kingdoms used different reckonings, so that one realm might have considered the year to be 3614 SAJ while its neighbor insisted on 3621 SAJ. A single agreed-upon calculation of the Tarquenian year was only arrived at in 4447 SAJ (by that same consensus reckoning) after a long and contentious conclave of scholars and priests from all over Achuirea.