Use a comma or a set of commas to make the year parenthetical when the date of the month is included:

July 4, 1776, is regarded as the birth date of American liberty.

Without the date itself, however, the comma disappears:

July 1776 was one of the most eventful months in our history.

In international or military format, no commas are used:

The Declaration of Independence was signed on 4 July 1776.

Good luck with your paper!

1. He was born on January 1, 1989, in Florida.

2. He arrived home on January 1, 1989, and began working.

However, in most of the default setting of the computers, the other style is being followed (that is, without a comma after the year).

Ex 2 no comma before “and”.

In Ex 2 use the comma before the conjunctions and, if, but, or, nor.

She bought a sweater, cashmere, on sale.

Cashmere is set between the two commas.

The sentence with the comma placed after the year is incorrect.