The comma is the most frequently used internal mark of punctuation. Of all the marks of punctuation, it has the widest variety of uses.

Using commas with dates, addresses, greetings, names, and large numbers

* Commas are used with full dates (month, day, and year) but omitted with partial dates (month and year):

1. Gas has been first used by the Germans on October 14, 1914, when they fired a prototype of modern tear gas from artillery near Pyres.