I have an standard object called case, I need to update a  custom field with case object attachment name

This field is a meeting time, Date/Time type: ideally I would like it to say Monday, January 1st at 12:00 PM but not sure if that's possible with the added "th" and "at" text. If that is not possible, help with the formula for the below example would be great.

Example: The field currently says 7/7/2016 3:00 PM. I want it to say Thursday, July 7, 2016 3:00 PM

Let me know if there is any questions I can answer to help this process. I'm new to the formula part of Salesforce so a thorogh explaination on how to set this up is greatly appretiated.