Just found an amazing website!
Dec25th.info website dedicated to exhaustively proving the date December 25th is the true date of Jesus Christ's birth.

Excerpt:
It’s that time of year again, the time when men of good will are subjected to the complaints of crusty, hard-hearted, pagan and atheist curmudgeons who would shut out every particle of joy from life; the time of year when we hear stale protests against the most celebrated event in history, the crowning point of the year, when the whole world rejoices at the Savior’s birth, and the story of the Nativity is told in every language; at that time when we should most rejoice for heaven’s salvation and the triumph of Christian faith, we are scolded instead, and told that celebrating Christmas is somehow “unchristian,” that it is somehow “pagan.”
“Wicked Christmas-keepers, Repent!”

Is there anything to these perennial objections? Can we celebrate the Nativity? Can we observe Christmas in our homes and churches? Or is the holiday season “lawful” only if it is secularized and kept free of Christ? Or is even this objectionable?
Throughout this website, we look at “anti-Christmasism” and address the question whether it is permitted to commemorate the Savior’s birth December 25th, and whether the dating is true?