Six months before Christmas, as Luke tells it. The Nativity of John the Baptist (or Birth of John the Baptist, or Nativity of the Forerunner, or colloquially Johnmas or St. John's Day (in German Johanni or Johannistag) is a Christian feast day. It is observed annually on 24 June. The Nativity of John the Baptist is a high-ranking liturgical feast, kept in the Catholic Church, Eastern Orthodox Church, Anglicanism, and Lutheranism. The sole biblical account of the birth of John the Baptist comes from the Gospel of Luke. Wiki link Dates computed from the General Roman Calendar. Text: Wikipedia (CC BY-SA).