English grammar rule Comma after a month
In North American English, dates are often written with a comma. The comma is placed between two words or numbers, but not between a word and a number. Examples are the best explanation. British and Australian English use a different date format without commas.
Correct Frederick will be here on Monday, July 4th. Correct Priscilla arrived at college in August 2007. Correct On July 20, 1969, twins were born to the Smith family.