@nickf’s correct. However, to be a little more precise:
// if you try to print it, it will return something like:
// Sat Mar 21 2009 20:13:07 GMT-0400 (Eastern Daylight Time)
// This time comes from the user's machine.
var myDate = new Date();
So if you want to display it as mm/dd/yyyy, you would do this:
var displayDate = (myDate.getMonth()+1) + "https://stackoverflow.com/" + (myDate.getDate()) + "https://stackoverflow.com/" + myDate.getFullYear();
Check out the full reference of the Date object. Unfortunately it is not nearly as nice to print out various formats as it is with other server-side languages. For this reason there-are-many-functions available in the wild.