The exact date of the month when Shakespeare was born is not known. I read this morning that owing to a mistake by an 18th-century author, the date is traditionally celebrated on April 23, the Feast of St. George, the patron saint of England. However, Shakespeare was baptized on April 26, 1564, and in the 16th century baptism generally followed rapidly after birth, so it would seem we are in the period of the Bard's birth, anyway.