JSFiddle - React, Tailwind, and code Playground

CSS

body{font-family:monospace;white-space:pre;}

JavaScript

var Response = {
    LCID: 321
};
Date.prototype.LCID = new Number();
Date.prototype.LCID.valueOf = function() { return Response.LCID; };


document.write("typeof new Date().LCID  = " + typeof new Date().LCID);
document.write("\nnew Date().LCID instanceof Number: " + (new Date().LCID instanceof Number));
document.write("\nnew Date().LCID == 321  = "+(new Date().LCID == 321));
 document.write("\nnew Date().LCID === 321 = "+(new Date().LCID === 321));
document.write("\nnew Date().LCID         = "+(new Date()).LCID);
document.write("\n  Setting Response.LCID = 456...\n")
Response.LCID = 456;
document.write("new Date().LCID         = " + (new Date()).LCID);