Christmas is on 25 December and now commemorates the Nativity of Jesus or Birth of Christ.
Christmas entailed two complementary versions
Christmas Father                 Christmas Baby
Christmas Man                     Christ Child, Jesus 
These two versions mirror pre-Christian themes:
The Old God                          The Young God which reflect other contrasts
Old Year Baby                       New Year Grandfather
Frost Kore,                             Hebe
Father Winter Saturn            Jupiter (Jove, Iuvenus)
25 December (q.v.) was also considered the birthday of Dusares Mithra Dionysius Bacchus Christmas also has alternative dates Egypt 6 January = Festival of Lights Kerstmis

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