Revised Julian calendar
Eastern churches celebrate Epiphany (Theophany) on January 6. Some, as in Greece, employ the modern Revised Julian calendar, which until the year 2800 coincides with the Gregorian calendar, the one in use for civil purposes in most countries. Other Eastern churches, as in Russia, hold to the older Julian calendar for reckoning church dates. In these old-calendar churches Epiphany falls at present on Gregorian January 19 – which is January 6 in the Julian calendar.