It depends on what you mean
Not recommended: I dedicate this book to my parents, Ayn Rand and God.
Recommended: I dedicate this book to my parents, Ayn Rand, and God
The first sentence states that the dedicator's parents are Ayn Rand & God and that the book is dedicated to them.
The second sentence states that the book is dedicated to all 4 and the assumption is made that the aforementioned parents are not Ayn Rand and God.
Mean what you say and say what you mean.
As for the date format, I applaud Google's compromise. I use the East-Asian format (YYYY-MM-DD) as a matter of course and it does not go down well in Europe. The U.S. format (mm-dd-yyyy) is confusing for non Leftpondians. 'September 13, 2017', however, is perfectly clear. To be sure, people whose first language is not English will be peeved at the use of English as default.