Yes.
Ex: October 18th, 2010
No, you shouldn't. You also don't use a comma if you have just the month and year with no day, e.g., June 2016. whitesmoke.com/uses-of-commas
NO. You replace the comma with "of"... For instance, July of 2009
A comma is usually placed after the day of the week when the date follows the day, as in Tuesday, January 12.
Yes, there is usually a comma. If you choose not to use a comma then you should remain consistent. For example, if you're writing an academic paper and using lots of dates then they should either all have commas or they should all have no commas.
No unless it's structurally necessary such as at the end of a preposition. When writing the date using numbers for the day and year, a comma is inserted between the two.
No, you don't put it after the year, but you put it after the date.
The best guide is to put a comma when there is a short gap between the words when spoken.
Place the comma after the month and the day: August 15, 2012
No, you do not typically put a comma between a person's last name and their suffix (e.g., Jr., Sr., III). You would write the full name without a comma between them.
You really need a comma after the day of the month - January 8, 1947.
Yes. In between the 1 and the 2.
Yes, a comma is typically used between a name and listing credentials. For example: John Smith, PhD.