Dates and commas

Should there be a comma following 20 in this sentence?:

Beginning Monday, Oct. 20, Californians will have the opportunity to vote early in the November 4 General Election.

Solution 1:

Yes.

Use the basic date format- Monday, October 20,2014,....... Monday, October 20,...........

The (AmE) full month-day-year date always requires commas before and after the year

                       Monday, October 20,2014,.......

Unless the date appears at the end of a sentence:

e.g., “She will attend the meeting on October 15, 2012.”.

This is always the case regardless of how the date is being used.

Incorrect: “I need a copy of your presentation of April 17, 2012 on the new company policies.”

Correct: “I need a copy of your presentation of April 17, 2012, on the new company policies.”