<Tr> <Th> Observances </Th> <Td> Church services </Td> </Tr> <Tr> <Th> Date </Th> <Td> <Ul> <Li> December 25 Western Christianity and some Eastern churches; secular world </Li> <Li> January 7 (O.S. December 25) Oriental Orthodoxy churches and most Eastern churches </Li> <Li> January 6 Armenian Apostolic Church </Li> <Li> January 19 (O.S. January 6) Armenian Patriarchate of Jerusalem </Li> </Ul> </Td> </Tr> <Ul> <Li> December 25 Western Christianity and some Eastern churches; secular world </Li> <Li> January 7 (O.S. December 25) Oriental Orthodoxy churches and most Eastern churches </Li> <Li> January 6 Armenian Apostolic Church </Li> <Li> January 19 (O.S. January 6) Armenian Patriarchate of Jerusalem </Li> </Ul> <Li> December 25 Western Christianity and some Eastern churches; secular world </Li>

When was christmas first celebrated on dec 25th