The year Rome was built (A.U.C) coincides with the date 753 BC of the Julian calendar and marks the beginning of time as kept by the Romans. The calendar of the Hellenistic era begins with the time of the Seleucids which coincides with the 1st of September or of October of the year 312 BC. To the Byzantines time was recorded from the year of the Creation of the world, that is to say the 1st September of 5509 BC. Alexandrian time was kept from the 29th or the 30th of August of the year 284 AD when Diocletian was enthroned and this calendar is still kept by the Copts to this day.