"Even as the Christ-child, in the beautiful Christian legend, is said to have been born on December 25th, so likewise was the Mithraic divinity said to have been born into human form on that same day of the year, which was the winter solstice. This day, or one a few days thereafter, has been commemorated as the birthday of other religious type-figures also. (Chapter 2)"
January 1, 1970
https://en.wikiquote.org/wiki/Gottfried_de_Purucker