THE NATIVITY FAST begins on November 15th through December 19th and is divided into two periods:
(A)The traditional fasting discipline (no meat, poultry, eggs, dairy, fish, wine, and olive oil) is observed on Monday, Wednesday and Friday, with a blessing for wine and olive oil (some also permit fish) on Tuesday and Thursday, and for fish, wine, and olive oil on Saturday and Sunday.
B) The period of the Forefeast, December 20th through 24th, when the traditional fasting discipline is observed Monday through Friday, with a blessing for wine and olive oil on Saturday and Sunday. The eve of the feast, December 24th is a strict fast day.