Flipclock countdown does not appear on pageload on IE

Question

The countdown is working fine in Chrome and Firefox. However, in IE, I am not sure why the countdown does not appear when the page is loaded in IE. I

One suggestion I attempted was to change the format of the date entered (which is the commented out date) which did not work.

$(document).ready(function () {
    var date = new Date("August 31, 2020 12:00 AM PST"); //Month Days, Year HH:MM:SS
    //var date = new Date('2020-08-31T11:00:00.000Z');
    var now = new Date();
    var diff = (date.getTime()/1000) - (now.getTime()/1000);
    
    if(diff <= 0){
        var clock = $('.clock').FlipClock(
            0, {
                countdown: true,
                clockFace: 'DailyCounter',
                callbacks: {
                stop: function() {
                  /*alert("Time is Up!!");*/
                }
            }
        });
    } else{ 
        var clock = $('.clock').FlipClock(
            diff, {
                countdown: true,
                clockFace: 'DailyCounter',
                callbacks: {
                stop: function() {
                 /**/
                }
            }
        });
    }
}); 

Another suggestion was to fix the -webkit- which when reviewing look fine to me.

Here is the css:

/* Get the bourbon mixin from http://bourbon.io */
/* Reset */
.flip-clock-wrapper * {
    -webkit-box-sizing: border-box;
    -moz-box-sizing: border-box;
    -ms-box-sizing: border-box;
    -o-box-sizing: border-box;
    box-sizing: border-box;
    -webkit-backface-visibility: hidden;
    -moz-backface-visibility: hidden;
    -ms-backface-visibility: hidden;
    -o-backface-visibility: hidden;
    backface-visibility: hidden;
}

.flip-clock-wrapper a {
  cursor: pointer;
  text-decoration: none;
  color: #ffffff; }

.flip-clock-wrapper a:hover {
  color: #fff; }

.flip-clock-wrapper ul {
  list-style: none; }

.flip-clock-wrapper.clearfix:before,
.flip-clock-wrapper.clearfix:after {
  content: " ";
  display: table; }

.flip-clock-wrapper.clearfix:after {
  clear: both; }

.flip-clock-wrapper.clearfix {
  *zoom: 1; }

/* Main */
.flip-clock-wrapper {
  font-weight: normal;
  font-size: 13px !important;
  font-family: "Helvetica Neue", Helvetica, sans-serif !important;
  -webkit-user-select: none; 
}

.flip-clock-meridium {
  background: none !important;
  box-shadow: 0 0 0 !important;
  font-size: 36px !important; }

.flip-clock-meridium a { color: #313333; }

.flip-clock-wrapper {
/*  text-align: center;
  position: relative;
  width: 100%;*/
  margin: 0 auto;
  max-width: 660px;
  margin-top: 2em;
}

.flip-clock-wrapper:before,
.flip-clock-wrapper:after {
    content: " "; /* 1 */
    display: table; /* 2 */
}
.flip-clock-wrapper:after {
    clear: both;
}

/* Skeleton */
.flip-clock-wrapper ul {
  position: relative;
  float: left;
  margin: 5px;
  width: 60px;
  height: 90px;
  font-size: 80px;
  font-weight: bold;
  line-height: 87px;
  border-radius: 6px;
  background: #337ab7;
}

.flip-clock-wrapper ul li {
  z-index: 1;
  position: absolute;
  left: 0;
  top: 0;
  width: 100%;
  height: 100%;
  line-height: 87px;
  text-decoration: none !important;
}

.flip-clock-wrapper ul li:first-child {
  z-index: 2; }

.flip-clock-wrapper ul li a {
  display: block;
  height: 100%;
  -webkit-perspective: 200px;
  -moz-perspective: 200px;
  perspective: 200px;
  margin: 0 !important;
  overflow: visible !important;
  cursor: default !important; }

.flip-clock-wrapper ul li a div {
  z-index: 1;
  position: absolute;
  left: 0;
  width: 100%;
  height: 50%;
  font-size: 80px;
  overflow: hidden; 
  outline: 1px solid transparent; }

.flip-clock-wrapper ul li a div .shadow {
  position: absolute;
  width: 100%;
  height: 100%;
  z-index: 2; }

.flip-clock-wrapper ul li a div.up {
  -webkit-transform-origin: 50% 100%;
  -moz-transform-origin: 50% 100%;
  -ms-transform-origin: 50% 100%;
  -o-transform-origin: 50% 100%;
  transform-origin: 50% 100%;
  top: 0; }

.flip-clock-wrapper ul li a div.up:after {
  content: "";
  position: absolute;
  top: 44px;
  left: 0;
  z-index: 5;
  width: 100%;
  height: 3px;
  background-color: #337ab7;
  background-color: rgba(0, 0, 0, 0.4); }

.flip-clock-wrapper ul li a div.down {
  -webkit-transform-origin: 50% 0;
  -moz-transform-origin: 50% 0;
  -ms-transform-origin: 50% 0;
  -o-transform-origin: 50% 0;
  transform-origin: 50% 0;
  bottom: 0;
  border-bottom-left-radius: 6px;
  border-bottom-right-radius: 6px;
}

.flip-clock-wrapper ul li a div div.inn {
  position: absolute;
  left: 0;
  z-index: 1;
  width: 100%;
  height: 200%;
  color: #ffffff;
  text-shadow: 0 1px 2px #337ab7;
  text-align: center;
  background-color: #333;
  border-radius: 6px;
  font-size: 70px; }

.flip-clock-wrapper ul li a div.up div.inn {
  top: 0; }

.flip-clock-wrapper ul li a div.down div.inn {
  bottom: 0; }

/* PLAY */
.flip-clock-wrapper ul.play li.flip-clock-before {
  z-index: 3; }

.flip-clock-wrapper .flip {   box-shadow: 0 2px 5px rgba(0, 0, 0, 0.7); }

.flip-clock-wrapper ul.play li.flip-clock-active {
  -webkit-animation: asd 0.5s 0.5s linear both;
  -moz-animation: asd 0.5s 0.5s linear both;
  animation: asd 0.5s 0.5s linear both;
  z-index: 5; }

.flip-clock-divider {
  float: left;
  display: inline-block;
  position: relative;
  width: 20px;
  height: 100px; }

.flip-clock-divider:first-child {
  width: 0; }

.flip-clock-dot {
  display: block;
  background: #337ab7;
  width: 10px;
  height: 10px;
  position: absolute;
  border-radius: 50%;
  box-shadow: 0 0 5px rgba(20, 48, 72, 0.5);
  left: 5px; }

.flip-clock-divider .flip-clock-label {
  position: absolute;
  top: -1.5em;
  right: -86px;
  color: black;
  text-shadow: none; }

.flip-clock-divider.minutes .flip-clock-label {
  right: -88px; }
  
@media screen and (min-width: 360px) and (max-width: 480px) {
    .flip-clock-divider.minutes .flip-clock-label {
        margin-right: 315px;
        margin-top: 135px;
    }
    
    .flip-clock-divider.minutes{
        margin-bottom: 36px;
    }
}

@media screen and (min-width: 640px) and (max-width: 780px) {
    
    .flip-clock-wrapper ul li a div div.inn {
        font-size: 64px;
    }
    
    .flip-clock-wrapper ul {
        width: 48px;
    }
    
}

.flip-clock-divider.seconds .flip-clock-label {
  right: -91px; }

.flip-clock-dot.top {
  top: 30px; }

.flip-clock-dot.bottom {
  bottom: 30px; }

@-webkit-keyframes asd {
  0% {
    z-index: 2; }

  20% {
    z-index: 4; }

  100% {
    z-index: 4; } }

@-moz-keyframes asd {
  0% {
    z-index: 2; }

  20% {
    z-index: 4; }

  100% {
    z-index: 4; } }

@-o-keyframes asd {
  0% {
    z-index: 2; }

  20% {
    z-index: 4; }

  100% {
    z-index: 4; } }

@keyframes asd {
  0% {
    z-index: 2; }

  20% {
    z-index: 4; }

  100% {
    z-index: 4; } }

.flip-clock-wrapper ul.play li.flip-clock-active .down {
  z-index: 2;
  -webkit-animation: turn 0.5s 0.5s linear both;
  -moz-animation: turn 0.5s 0.5s linear both;
  animation: turn 0.5s 0.5s linear both; }

@-webkit-keyframes turn {
  0% {
    -webkit-transform: rotateX(90deg); }

  100% {
    -webkit-transform: rotateX(0deg); } }

@-moz-keyframes turn {
  0% {
    -moz-transform: rotateX(90deg); }

  100% {
    -moz-transform: rotateX(0deg); } }

@-o-keyframes turn {
  0% {
    -o-transform: rotateX(90deg); }

  100% {
    -o-transform: rotateX(0deg); } }

@keyframes turn {
  0% {
    transform: rotateX(90deg); }

  100% {
    transform: rotateX(0deg); } }

.flip-clock-wrapper ul.play li.flip-clock-before .up {
  z-index: 2;
  -webkit-animation: turn2 0.5s linear both;
  -moz-animation: turn2 0.5s linear both;
  animation: turn2 0.5s linear both; }

@-webkit-keyframes turn2 {
  0% {
    -webkit-transform: rotateX(0deg); }

  100% {
    -webkit-transform: rotateX(-90deg); } }

@-moz-keyframes turn2 {
  0% {
    -moz-transform: rotateX(0deg); }

  100% {
    -moz-transform: rotateX(-90deg); } }

@-o-keyframes turn2 {
  0% {
    -o-transform: rotateX(0deg); }

  100% {
    -o-transform: rotateX(-90deg); } }

@keyframes turn2 {
  0% {
    transform: rotateX(0deg); }

  100% {
    transform: rotateX(-90deg); } }

.flip-clock-wrapper ul li.flip-clock-active {
  z-index: 3; }

/* SHADOW */
.flip-clock-wrapper ul.play li.flip-clock-before .up .shadow {
  background: -moz-linear-gradient(top, rgba(0, 0, 0, 0.1) 0%, #337ab7 100%);
  background: -webkit-gradient(linear, left top, left bottom, color-stop(0%, rgba(0, 0, 0, 0.1)), color-stop(100%, #337ab7));
  background: linear, top, rgba(0, 0, 0, 0.1) 0%, #337ab7 100%;
  background: -o-linear-gradient(top, rgba(0, 0, 0, 0.1) 0%, #337ab7 100%);
  background: -ms-linear-gradient(top, rgba(0, 0, 0, 0.1) 0%, #337ab7 100%);
  background: linear, to bottom, rgba(0, 0, 0, 0.1) 0%, #337ab7 100%;
  -webkit-animation: show 0.5s linear both;
  -moz-animation: show 0.5s linear both;
  animation: show 0.5s linear both; }

.flip-clock-wrapper ul.play li.flip-clock-active .up .shadow {
  background: -moz-linear-gradient(top, rgba(0, 0, 0, 0.1) 0%, #337ab7 100%);
  background: -webkit-gradient(linear, left top, left bottom, color-stop(0%, rgba(0, 0, 0, 0.1)), color-stop(100%, #337ab7));
  background: linear, top, rgba(0, 0, 0, 0.1) 0%, #337ab7 100%;
  background: -o-linear-gradient(top, rgba(0, 0, 0, 0.1) 0%, #337ab7 100%);
  background: -ms-linear-gradient(top, rgba(0, 0, 0, 0.1) 0%, #337ab7 100%);
  background: linear, to bottom, rgba(0, 0, 0, 0.1) 0%, #337ab7 100%;
  -webkit-animation: hide 0.5s 0.3s linear both;
  -moz-animation: hide 0.5s 0.3s linear both;
  animation: hide 0.5s 0.3s linear both; }

/*DOWN*/
.flip-clock-wrapper ul.play li.flip-clock-before .down .shadow {
  background: -moz-linear-gradient(top, #337ab7 0%, rgba(0, 0, 0, 0.1) 100%);
  background: -webkit-gradient(linear, left top, left bottom, color-stop(0%, #337ab7), color-stop(100%, rgba(0, 0, 0, 0.1)));
  background: linear, top, #337ab7 0%, rgba(0, 0, 0, 0.1) 100%;
  background: -o-linear-gradient(top, #337ab7 0%, rgba(0, 0, 0, 0.1) 100%);
  background: -ms-linear-gradient(top, #337ab7 0%, rgba(0, 0, 0, 0.1) 100%);
  background: linear, to bottom, #337ab7 0%, rgba(0, 0, 0, 0.1) 100%;
  -webkit-animation: show 0.5s linear both;
  -moz-animation: show 0.5s linear both;
  animation: show 0.5s linear both; }

.flip-clock-wrapper ul.play li.flip-clock-active .down .shadow {
  background: -moz-linear-gradient(top, #337ab7 0%, rgba(0, 0, 0, 0.1) 100%);
  background: -webkit-gradient(linear, left top, left bottom, color-stop(0%, #337ab7), color-stop(100%, rgba(0, 0, 0, 0.1)));
  background: linear, top, #337ab7 0%, rgba(0, 0, 0, 0.1) 100%;
  background: -o-linear-gradient(top, #337ab7 0%, rgba(0, 0, 0, 0.1) 100%);
  background: -ms-linear-gradient(top, #337ab7 0%, rgba(0, 0, 0, 0.1) 100%);
  background: linear, to bottom, #337ab7 0%, rgba(0, 0, 0, 0.1) 100%;
  -webkit-animation: hide 0.5s 0.3s linear both;
  -moz-animation: hide 0.5s 0.3s linear both;
  animation: hide 0.5s 0.2s linear both; }

@-webkit-keyframes show {
  0% {
    opacity: 0; }

  100% {
    opacity: 1; } }

@-moz-keyframes show {
  0% {
    opacity: 0; }

  100% {
    opacity: 1; } }

@-o-keyframes show {
  0% {
    opacity: 0; }

  100% {
    opacity: 1; } }

@keyframes show {
  0% {
    opacity: 0; }

  100% {
    opacity: 1; } }

@-webkit-keyframes hide {
  0% {
    opacity: 1; }

  100% {
    opacity: 0; } }

@-moz-keyframes hide {
  0% {
    opacity: 1; }

  100% {
    opacity: 0; } }

@-o-keyframes hide {
  0% {
    opacity: 1; }

  100% {
    opacity: 0; } }

@keyframes hide {
  0% {
    opacity: 1; }

  100% {
    opacity: 0; } }
    
.center{
    position: relative;
    top: 50%;
    text-align: center;
    margin-right: auto;
    margin-left: auto;
}

.timer {
    zoom: 0.5;
    -moz-transform: scale(0.5);
}

.flip-clock {
    display: inline-block !important;
    width: auto !important;
}

/*===================
Change panels to color
=====================*/
.flip-clock-wrapper ul.flip:nth-child(2) li a div div.inn,
.flip-clock-wrapper ul.flip:nth-child(3) li a div div.inn
{
    background : #337ab7;
}

.flip-clock-wrapper ul.flip:nth-child(5) li a div div.inn,
.flip-clock-wrapper ul.flip:nth-child(6) li a div div.inn
{
    background : #337ab7;
}

.flip-clock-wrapper ul.flip:nth-child(8) li a div div.inn,
.flip-clock-wrapper ul.flip:nth-child(9) li a div div.inn
{
    background : #337ab7;
}

.flip-clock-wrapper ul.flip:nth-child(10) li a div div.inn,
.flip-clock-wrapper ul.flip:nth-child(11) li a div div.inn
{
    background : #337ab7;
}

.flip-clock-wrapper ul.flip:nth-child(11) li a div div.inn,
.flip-clock-wrapper ul.flip:nth-child(12) li a div div.inn
{
    background : #337ab7;
}

/*=====================
Add Responsiveness
=======================*/
// 
// ------------------------- FlipClock
// 
$clock-flip-font-size: 120px
$clock-flip-border-radius: 8px
$clock-digit-gap: 20px
$clock-dot-size: 20px

$clock-height: ($clock-flip-font-size * 1.2)
$clock-flip-width: ($clock-flip-font-size * 0.8)
$clock-flip-margin: ($clock-digit-gap / 2)
$clock-flip-section-width: (2 * ($clock-flip-width + 2 * $clock-flip-margin))

$clock-flip-bg: #607D8B
$clock-flip-shadow: 0 2px 5px rgba(0, 0, 0, 0.7)
$clock-flip-font-color: #F44336
$clock-flip-font-shadow: 0 1px 2px #337ab7

.countdown-wrapper
  left: 50%
  position: absolute
  top: 50%
  transform: translate(-50%, -50%)

.countdown.flip-clock-wrapper ul
  height: $clock-height
  margin: 0 $clock-flip-margin
  width: $clock-flip-width
  box-shadow: $clock-flip-shadow

.countdown.flip-clock-wrapper ul li
  line-height: $clock-height

.countdown.flip-clock-wrapper ul li a div div.inn
  background-color: $clock-flip-bg
  color: $clock-flip-font-color
  font-size: $clock-flip-font-size
  text-shadow: $clock-flip-font-shadow

.countdown.flip-clock-wrapper ul,
.countdown.flip-clock-wrapper ul li a div div.inn
  border-radius: $clock-flip-border-radius

.countdown.flip-clock-wrapper ul li a div.down
  border-bottom-left-radius: $clock-flip-border-radius
  border-bottom-right-radius: $clock-flip-border-radius

.countdown.flip-clock-wrapper ul li a div.up:after
  top: (($clock-height / 2) - 1px)

.countdown .flip-clock-dot.top
  top: ($clock-height / 2 - $clock-flip-font-size * 0.2 - $clock-dot-size / 2)

.countdown .flip-clock-dot.bottom
  top: ($clock-height / 2 + $clock-flip-font-size * 0.2 - $clock-dot-size / 2)

.countdown .flip-clock-dot
  height: $clock-dot-size
  left: $clock-dot-size
  width: $clock-dot-size
  background: $clock-flip-bg

.countdown .flip-clock-divider
  height: $clock-height
  width: ($clock-dot-size * 3)
  &:first-child
    width: 0

.countdown .flip-clock-divider.seconds .flip-clock-label,
.countdown .flip-clock-divider.minutes .flip-clock-label
  right: -1 * $clock-flip-section-width

.countdown .flip-clock-divider .flip-clock-label
  color: $clock-flip-font-color
  font-size: $clock-flip-font-size / 4
  width: 2 * $clock-flip-width + 4 * $clock-flip-margin

Any help would be appreciated