CodePen Embed - Spinning Clock 2

<head>
  <link href="https://fonts.googleapis.com/css?family=Righteous" rel="stylesheet">
  <link rel="stylesheet" href="spin.css">
</head>

<script src="spin.js"></script>

<body>

  <div class="container">

    <!-- Hours -->

    <div class="spinner" id="spinner_h1">
      <div class="num num_0" id="num_0_h1">
        <div>0</div>
      </div>
      <div class="num num_1" id="num_1_h1">
        <div>1</div>
      </div>
      <div class="num num_2" id="num_2_h1">
        <div>2</div>
      </div>
    </div>

    <div class="spinner" id="spinner_h2">
      <div class="num num_0" id="num_0_h2">
        <div>0</div>
      </div>
      <div class="num num_1" id="num_1_h2">
        <div>1</div>
      </div>
      <div class="num num_2" id="num_2_h2">
        <div>2</div>
      </div>
      <div class="num num_3" id="num_3_h2">
        <div>3</div>
      </div>
      <div class="num num_4" id="num_4_h2">
        <div>4</div>
      </div>
      <div class="num num_5" id="num_5_h2">
        <div>5</div>
      </div>
      <div class="num num_6" id="num_6_h2">
        <div>6</div>
      </div>
      <div class="num num_7" id="num_7_h2">
        <div>7</div>
      </div>
      <div class="num num_8" id="num_8_h2">
        <div>8</div>
      </div>
      <div class="num num_9" id="num_9_h2">
        <div>9</div>
      </div>
    </div>

    <!-- Minutes -->

    <div class="spinner" id="spinner_m1">
      <div class="num num_0" id="num_0_m1">
        <div>0</div>
      </div>
      <div class="num num_1" id="num_1_m1">
        <div>1</div>
      </div>
      <div class="num num_2" id="num_2_m1">
        <div>2</div>
      </div>
      <div class="num num_3" id="num_3_m1">
        <div>3</div>
      </div>
      <div class="num num_4" id="num_4_m1">
        <div>4</div>
      </div>
      <div class="num num_5" id="num_5_m1">
        <div>5</div>
      </div>
    </div>

    <div class="spinner" id="spinner_m2">
      <div class="num num_0" id="num_0_m2">
        <div>0</div>
      </div>
      <div class="num num_1" id="num_1_m2">
        <div>1</div>
      </div>
      <div class="num num_2" id="num_2_m2">
        <div>2</div>
      </div>
      <div class="num num_3" id="num_3_m2">
        <div>3</div>
      </div>
      <div class="num num_4" id="num_4_m2">
        <div>4</div>
      </div>
      <div class="num num_5" id="num_5_m2">
        <div>5</div>
      </div>
      <div class="num num_6" id="num_6_m2">
        <div>6</div>
      </div>
      <div class="num num_7" id="num_7_m2">
        <div>7</div>
      </div>
      <div class="num num_8" id="num_8_m2">
        <div>8</div>
      </div>
      <div class="num num_9" id="num_9_m2">
        <div>9</div>
      </div>
    </div>

    <!-- Seconds -->

    <div class="spinner" id="spinner_s1">
      <div class="num num_0" id="num_0_s1">
        <div>0</div>
      </div>
      <div class="num num_1" id="num_1_s1">
        <div>1</div>
      </div>
      <div class="num num_2" id="num_2_s1">
        <div>2</div>
      </div>
      <div class="num num_3" id="num_3_s1">
        <div>3</div>
      </div>
      <div class="num num_4" id="num_4_s1">
        <div>4</div>
      </div>
      <div class="num num_5" id="num_5_s1">
        <div>5</div>
      </div>
    </div>

    <div class="spinner" id="spinner_s2">
      <div class="num num_0" id="num_0_s2">
        <div>0</div>
      </div>
      <div class="num num_1" id="num_1_s2">
        <div>1</div>
      </div>
      <div class="num num_2" id="num_2_s2">
        <div>2</div>
      </div>
      <div class="num num_3" id="num_3_s2">
        <div>3</div>
      </div>
      <div class="num num_4" id="num_4_s2">
        <div>4</div>
      </div>
      <div class="num num_5" id="num_5_s2">
        <div>5</div>
      </div>
      <div class="num num_6" id="num_6_s2">
        <div>6</div>
      </div>
      <div class="num num_7" id="num_7_s2">
        <div>7</div>
      </div>
      <div class="num num_8" id="num_8_s2">
        <div>8</div>
      </div>
      <div class="num num_9" id="num_9_s2">
        <div>9</div>
      </div>
    </div>

    <div class="top">▶</div>

  </div>

</body>



*{font-family: 'Righteous', cursive;
}

body {background-color:#32ae8a;}

.spinner
{
position:absolute; border-radius:100%; overflow:hidden; 
}



.num
{display:block;
 position:absolute;
 width:100%; line-height:110%;}



/*Hours*/

#spinner_h1 .num_1{transform:rotate( 120deg );}
#spinner_h1 .num_2{transform:rotate( 240deg );}

#spinner_h2 .num_1{transform:rotate( 36deg );}
#spinner_h2 .num_2{transform:rotate( 72deg );}
#spinner_h2 .num_3{transform:rotate( 108deg );}
#spinner_h2 .num_4{transform:rotate( 144deg );}
#spinner_h2 .num_5{transform:rotate( 180deg );}
#spinner_h2 .num_6{transform:rotate( 216deg );}
#spinner_h2 .num_7{transform:rotate( 252deg );}
#spinner_h2 .num_8{transform:rotate( 288deg );}
#spinner_h2 .num_9{transform:rotate( 324deg );}

/*Minutes*/

#spinner_m1 .num_1{transform:rotate( 60deg );}
#spinner_m1 .num_2{transform:rotate( 120deg );}
#spinner_m1 .num_3{transform:rotate( 180deg );}
#spinner_m1 .num_4{transform:rotate( 240deg );}
#spinner_m1 .num_5{transform:rotate( 300deg );}

#spinner_m2 .num_1{transform:rotate( 36deg );}
#spinner_m2 .num_2{transform:rotate( 72deg );}
#spinner_m2 .num_3{transform:rotate( 108deg );}
#spinner_m2 .num_4{transform:rotate( 144deg );}
#spinner_m2 .num_5{transform:rotate( 180deg );}
#spinner_m2 .num_6{transform:rotate( 216deg );}
#spinner_m2 .num_7{transform:rotate( 252deg );}
#spinner_m2 .num_8{transform:rotate( 288deg );}
#spinner_m2 .num_9{transform:rotate( 324deg );}

/*Seconds*/

#spinner_s1 .num_1{transform:rotate( 60deg );}
#spinner_s1 .num_2{transform:rotate( 120deg );}
#spinner_s1 .num_3{transform:rotate( 180deg );}
#spinner_s1 .num_4{transform:rotate( 240deg );}
#spinner_s1 .num_5{transform:rotate( 300deg );}

#spinner_s2 .num_1{transform:rotate( 36deg );}
#spinner_s2 .num_2{transform:rotate( 72deg );}
#spinner_s2 .num_3{transform:rotate( 108deg );}
#spinner_s2 .num_4{transform:rotate( 144deg );}
#spinner_s2 .num_5{transform:rotate( 180deg );}
#spinner_s2 .num_6{transform:rotate( 216deg );}
#spinner_s2 .num_7{transform:rotate( 252deg );}
#spinner_s2 .num_8{transform:rotate( 288deg );}
#spinner_s2 .num_9{transform:rotate( 324deg );}

/*Hours/Minutes/Seconds*/


/*Size*/
:root {--base: 6vmin;} /*CSS variables.Needs a CSS preprocessor to work on older browsers*/

body{padding:0;margin:0;}

.container{ 
overflow:hidden; position:relative;
width:calc(var(--base) * 14); height:calc(var(--base) * 14);
top:calc(50% - (var(--base) * 7));
margin-left:auto; margin-right:auto;}


#spinner_s2{top:  calc(var(--base) * 0);  left:  calc(var(--base) * 0);} 
#spinner_s1{top:  calc(var(--base) * 1);  left:  calc(var(--base) * 1);} 
#spinner_m2{top:  calc(var(--base) * 2);  left:  calc(var(--base) * 2);}   
#spinner_m1{top:  calc(var(--base) * 3);  left:  calc(var(--base) * 3);}  
#spinner_h2{top:  calc(var(--base) * 4);  left:  calc(var(--base) * 4);}     
#spinner_h1{top:  calc(var(--base) * 5);  left:  calc(var(--base) * 5);} 

#spinner_s2{width:calc(var(--base) * 14); height:calc(var(--base) * 14);}
#spinner_s1{width:calc(var(--base) * 12); height:calc(var(--base) * 12);}
#spinner_m2{width:calc(var(--base) * 10); height:calc(var(--base) * 10);}
#spinner_m1{width:calc(var(--base) * 8);  height:calc(var(--base) * 8);}
#spinner_h2{width:calc(var(--base) * 6);  height:calc(var(--base) * 6);}
#spinner_h1{width:calc(var(--base) * 4);  height:calc(var(--base) * 4);}

.num { font-size:var(--base);}


#spinner_h1 .num,#spinner_h2 .num, #spinner_m1 .num,#spinner_m2 .num, #spinner_s1 .num,#spinner_s2 .num
{top:50%; height:var(--base); margin-top:calc(var(--base)/-2); }



/*.num div{padding-left:calc(var(--base)/7);}*/

.num div{float:right; padding:0; width:calc(var(--base)/1.1); text-align:center;
color:darkgoldenrod;  }


.top
{position:absolute; display:block; box-sizing:border-box;
top:  calc(var(--base) * 6);  left:  calc(var(--base) * 6);
width:calc(var(--base) * 2); height:calc(var(--base) * 2); padding-left: calc(var(--base)/3);
text-align:center; line-height:165%; font-size:var(--base);
border:calc(var(--base)/10) solid GoldenRod; border-radius:100%; overflow:hidden;
color:ivory;}



.spinner
{border:calc(var(--base)/10) solid GoldenRod; box-sizing:border-box;}

#spinner_s1,
#spinner_m1,
#spinner_h1
{border:calc(var(--base)/15) solid rgba(218, 165, 32, 0.3);}



/*Transitions !*/

/*Hours*/
.spinner_h1_0{transform:rotate( 360deg );}
.spinner_h1_1{transform:rotate( 240deg );}
.spinner_h1_2{transform:rotate( 120deg );}
.spinner_h1_switch{transform:rotate( 480deg ); transition: none !important;}

.spinner_h2_0{transform:rotate( 360deg );}
.spinner_h2_1{transform:rotate( 324deg );}
.spinner_h2_2{transform:rotate( 288deg );}
.spinner_h2_3{transform:rotate( 252deg );}
.spinner_h2_4{transform:rotate( 216deg );}
.spinner_h2_5{transform:rotate( 180deg );}
.spinner_h2_6{transform:rotate( 144deg );}
.spinner_h2_7{transform:rotate( 108deg );}
.spinner_h2_8{transform:rotate( 72deg );}
.spinner_h2_9{transform:rotate( 36deg );}
.spinner_h2_switch{transform:rotate( 396deg ); transition: none !important;}

/*Minutes*/
.spinner_m1_0{transform:rotate( 360deg );}
.spinner_m1_1{transform:rotate( 300deg );}
.spinner_m1_2{transform:rotate( 240deg );}
.spinner_m1_3{transform:rotate( 180deg );}
.spinner_m1_4{transform:rotate( 120deg );}
.spinner_m1_5{transform:rotate( 60deg );}
.spinner_m1_switch{transform:rotate( 420deg ); transition: none !important;} 

.spinner_m2_0{transform:rotate( 360deg );}
.spinner_m2_1{transform:rotate( 324deg );}
.spinner_m2_2{transform:rotate( 288deg );}
.spinner_m2_3{transform:rotate( 252deg );}
.spinner_m2_4{transform:rotate( 216deg );}
.spinner_m2_5{transform:rotate( 180deg );}
.spinner_m2_6{transform:rotate( 144deg );}
.spinner_m2_7{transform:rotate( 108deg );}
.spinner_m2_8{transform:rotate( 72deg );}
.spinner_m2_9{transform:rotate( 36deg );}
.spinner_m2_switch{transform:rotate( 396deg ); transition: none !important;}

/*Seconds*/ 
.spinner_s1_0{transform:rotate( 360deg );}
.spinner_s1_1{transform:rotate( 300deg );}
.spinner_s1_2{transform:rotate( 240deg );}
.spinner_s1_3{transform:rotate( 180deg );}
.spinner_s1_4{transform:rotate( 120deg );}
.spinner_s1_5{transform:rotate( 60deg );}
.spinner_s1_switch{transform:rotate( 420deg ); transition: none !important;}

.spinner_s2_0{transform:rotate( 360deg );}
.spinner_s2_1{transform:rotate( 324deg );}
.spinner_s2_2{transform:rotate( 288deg );}
.spinner_s2_3{transform:rotate( 252deg );}
.spinner_s2_4{transform:rotate( 216deg );}
.spinner_s2_5{transform:rotate( 180deg );}
.spinner_s2_6{transform:rotate( 144deg );}
.spinner_s2_7{transform:rotate( 108deg );}
.spinner_s2_8{transform:rotate( 72deg );}
.spinner_s2_9{transform:rotate( 36deg );}
.spinner_s2_switch{transform:rotate( 396deg ); transition: none !important;}


.num div{transition: transform 500ms ease-out , color 500ms ease-out; , font-size 500ms ease-out;}
.lit div{color:ivory; font-size:calc(var(--base)*1.3); transition: transform 500ms ease-out , color 500ms ease-out , font-size 500ms ease-out;}

.spinner{transition: transform 500ms ease-in;}


/*This fixes a bug on chrome*/
*{-webkit-backface-visibility: hidden;
  -webkit-transform: translateZ(0) scale(1.0, 1.0);}

html,body{height:100%;}

//These functions help add, remove or toggle css classes

function tog_class(id, cl) {
  var elem = document.getElementById(id);
  if (elem == null) {
    return 0;
  }
  if (elem.classList.contains(cl) === true) {
    elem.classList.remove(cl);
  } else {
    elem.classList.add(cl);
  }
}

function add_class(id, cl) {
  var elem = document.getElementById(id);
  if (elem == null) {
    return 0;
  }
  if (elem.classList.contains(cl) !== true) {
    elem.classList.add(cl);
  }
}

function rem_class(id, cl) {
  var elem = document.getElementById(id);
  if (elem == null) {
    return 0;
  }
  if (elem.classList.contains(cl) === true) {
    elem.classList.remove(cl);
  }
}

//This function gets the date and does operations using H/M/S

function startTime() {
  var today = new Date();
  var h = today.getHours();
  var m = today.getMinutes();
  var s = today.getSeconds();

  var h1 = (h - h % 10) / 10;
  var h2 = h % 10;

  var m1 = (m - m % 10) / 10;
  var m2 = m % 10;

  var s1 = (s - s % 10) / 10;
  var s2 = s % 10;

  set_spin_class("s1", s1);
  set_spin_class("s2", s2);

  set_spin_class("m1", m1);
  set_spin_class("m2", m2);

  set_spin_class("h1", h1);
  set_spin_class("h2", h2);

  var t = setTimeout(startTime, 500);
}

//This function calls the appropriate class changes

// It receives the type of spinner to change (m1 for example) and changes classes based on the current time

function set_spin_class(target, val) {
  for (i = 0; i < 10; i++) {
    if (i != val) {
      rem_class("spinner_" + target, "spinner_" + target + "_" + i);
      rem_class("num_" + i + "_" + target, "lit");
    }
  }
  add_class("spinner_" + target, "spinner_" + target + "_" + val);
  add_class("num_" + val + "_" + target, "lit");

  if (val === 0) {
    deswitcher(target, val);
  } /*These functions prevent the clock from changing direction*/
  setTimeout(function() {
    switcher(target, val);
  }, 500);
}

function switcher(target, val) {
  switch ("spinner_" + target + "_" + val) {
    case "spinner_h1_2":
      rem_class("spinner_h1", "spinner_h1_2");
      add_class("spinner_h1", "spinner_h1_switch");
      break;
    case "spinner_h2_9":
      rem_class("spinner_h2", "spinner_h1_2");
      add_class("spinner_h2", "spinner_h2_switch");
      break;

    case "spinner_m1_5":
      rem_class("spinner_m1", "spinner_m1_5");
      add_class("spinner_m1", "spinner_m1_switch");
      break;
    case "spinner_m2_9":
      rem_class("spinner_m2", "spinner_m2_9");
      add_class("spinner_m2", "spinner_m2_switch");
      break;

    case "spinner_s1_5":
      rem_class("spinner_s1", "spinner_s1_5");
      add_class("spinner_s1", "spinner_s1_switch");
      break;
    case "spinner_s2_9":
      rem_class("spinner_s2", "spinner_s2_9");
      add_class("spinner_s2", "spinner_s2_switch");
      break;
  }
}
function deswitcher(target, val) {
  rem_class("spinner_" + target, "spinner_" + target + "_switch");
}

//Do stuff here

window.onload = function() {
  startTime();
};

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