In safari, the script does not work correctly, in other browsers it is normal, why?

Question

JavaScript

Good day.
There is a script that takes a value from the page, performs operations with it and inserts ready-made numbers back onto the page - a timer, you can see it here: euromade.bookreev.com

The problem is that in safari it returns NaN values ​​to me, but in the same chrome is fine.


Here is the script on Codepen

Answer 1

Issue resolved
Date format was written 07 09 2016 23:59:59
Fixed to July 09 2016 23:59:59and everything worked
But it's interesting to know why safari responds to this and other browsers don't.
If someone can give some comment, I will be grateful