While the month and date of Jesus' birth are unknown, by the early-to-mid 4th century, the Western Christian Church had placed Christmas on December 25,a date later adopted in the East. Today, most Christians celebrate Christmas on the date of December 25 in the Gregorian calendar, which is also the calendar in near-universal use in the secular world. However, some Eastern churches celebrate Christmas on the December 25 of the older Julian calendar, which currently corresponds to January 7 i