Keep in mind that the comma in "6 April 1988" is typically omitted.
The final format is the best for writing dates since the words that separate the numerals make them easy to understand.
In a direct address, a name or title is parenthetic.
Sir, I cannot foretell what will occur if you refuse.
Well, Susan, you are in a terrific situation right now.
Following a name, there are certain abbreviations that are parenthetic and need to be punctuated appropriately. These include etc., i.e., and e.g., the abbreviations for academic degrees, and titles.
This is where letters, shipments, etc., should go.
Dr. Horace Fulsome presided.
Lawyer Rachel Simonds
the venerable SJ Harry Lang
A noun should not be separated from a limiting phrase of identification by a comma, nevertheless.
Jane Austen is an author.
Conqueror William
Sappho the author
Junior, which is sometimes abbreviated Jr., has been thought of as parenthetic, although reasoning argues that it is really restricted and doesn't require a comma.
James Jr. Wright
Written by: Name Style
