JSFiddle - React, Tailwind, and code Playground

HTML

<div>
    <input id="isoDateTime" value="" size="20" style="float:left" />&nbsp;<button id="isoToDateTime">Go</button><br style="clear:left;"/>
    Converted Date Time: <span id="isoToDateTimeTarget"></span>
</div>

JavaScript

var $j = jQuery.noConflict();
var d = new Date();
var isoNow = isoDateTime(d);
$j(function(){
    $j('#isoDateTime').val(isoNow);
    $j('#isoToDateTime').click(function() {
        var iso = $j('#isoDateTime').val(); 
        var dt = isoToDateTime(iso);
        $j('#isoToDateTimeTarget').html(dt);
    });
});
function isoDateTime(d) {
    function pad(n){
        return n<10 ? '0'+n : n
    }
    return d.getUTCFullYear()+'-'
    + pad(d.getUTCMonth()+1)+'-'
    + pad(d.getUTCDate())+'T'
    + pad(d.getUTCHours())+':'
    + pad(d.getUTCMinutes())+':'
    + pad(d.getUTCSeconds())+'Z'
}
function isoToDateTime(value) {
    var output = '';
    if (value != '0001-01-01T00:00:00') {
        var d = new Date();
        d.setISO8601(value);
        //desired output format: 5/17/2011 8:34:56 AM - below does not return local time
        output = d.getMonth() + 1 + "/" + d.getDate() + "/" + d.getFullYear() + " " + setClockTime(d)
    }
    return output;
}
function setClockTime(d)
{
    var h   = d.getHours();
    var m = d.getMinutes();
    var s = d.getSeconds();
    var suffix = "AM";
    if (h > 11) {suffix = "PM";}
    if (h > 12) {h = h - 12;}
    if (h == 0) {h = 12;}
    if (h < 10) {h = "0" + h;}
    if (m < 10) {m = "0" + m;}
    if (s < 10) {s = "0" + s;}
    return h + ":" + m + ":" + s + " " + suffix;
}
//convert an ISO8601 date string into a js date object
Date.prototype.setISO8601 = function(dString){
var regexp = /(\d\d\d\d)(-)?(\d\d)(-)?(\d\d)(T)?(\d\d)(:)?(\d\d)(:)?(\d\d)(\.\d+)?(Z|([+-])(\d\d)(:)?(\d\d))/;
if (dString.toString().match(new RegExp(regexp))) {
    var regexp = /(\d\d\d\d)(-)?(\d\d)(-)?(\d\d)(T)?(\d\d)(:)?(\d\d)(:)?(\d\d)(\.\d+)?(Z|([+-])(\d\d)(:)?(\d\d))/;
    if (dString.toString().match(new RegExp(regexp))) {
        var d = dString.match(new RegExp(regexp));
        var offset = 0;
        this.setUTCDate(1);
        this.setUTCFullYear(parseInt(d[1],10));
        this.setUTCMonth(parseInt(d[3],10) - 1);
       ...