Armenians usually celebrate Christmas on January 6. The reason for this unusual date emerges from ancient history. "In the fourth century Roman Catholic Church, officials established the date of Christmas as December 25th." Before that time, Armenians celebrated Christmas ("surb tsnunt", Սուրբ Ծնունդ, meaning "Holy Birth") on January 6 as a public holiday in Armenia. It also coincides with the Epiphany. The Armenians denied the new Roman mandate regarding Christmas, and continued to celebrate both the Nativity and Jesus’ baptism on January 6. When the Gregorian calendar was implemented in 1582, the Armenians rejected the reformed calendar and remained following the Julian Calendar. But today, only the Armenian Patriarchate of Jerusalem still uses the Julian Calendar. Since the Julian calendar is thirteen days behind the Gregorian Calendar, when the Armenians of Jerusalem celebrate Christmas on January 6 according to the Julian calendar the Gregorian calendar counts the day as January 19.