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.

Examples of 'Comma after a month' rule

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.