An ancient custom in the Roman liturgy is the solemn proclamation, or Kalenda, of the Nativity at the start of the Christmas Eve Mass.  A translation of the text as chanted in the video (made in St Peter's Basilica in 2012) appears below.

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  In the twenty-fifth day of the month of December,

In the year five thousand one hundred and ninety-nine from the creation of the world, when in the beginning God created the heavens and the earth;

In the year two thousand nine hundred and fifty-seven from the flood;

In the year two thousand and fifty-one from the birth of Abraham;

In the year one thousand five hundred and ten from the going forth of the people of Israel out of Egypt under Moses;

In the year one thousand and thirty-two from the anointing of David as king;

In the fifty-sixth week according to the prophecy of Daniel;

In the one hundred and ninety-fourth Olympiad;

In the year seven hundred and fifty-two from the foundation of the city of Rome;

In the forty-second year of the reign of the Emperor Octavian Augustus;

In the sixth age of the world, while the whole earth was at peace--

JESUS CHRIST  eternal God and the Son of the eternal Father, willing to consecrate the world by His gracious coming, having been conceived of the Holy Spirit, and the nine months of His conception being now accomplished, was born in Bethlehem of Judea of the Virgin Mary and made flesh.

The birth of our Lord Jesus Christ, according to the flesh.