No, I've been through the patent process and this has zero weight. All the Patent Office cares about is when you submitted the patent application.
The very first thing you do is a patent search. Identify similar patents and determine what makes yours unique.
This is true. Never has this ever worked with the patent office to prove an invention date. You simply need a lab book that's signed, dated and notarized. Emails to your self disclosing the invention, etc.