Vue

HTML

<script src="https://cdnjs.cloudflare.com/ajax/libs/moment.js/2.27.0/moment.min.js"></script>
<div id="app">
  <p>
  Time is {{roomTime}}
  </p>
  <br/>
  <p>
  How to make it display 01:05 not 01:00
  </p>
 </div>

CSS

body {
  background: #20262E;
  padding: 20px;
  font-family: Helvetica;
}

#app {
  background: #fff;
  border-radius: 4px;
  padding: 20px;
  transition: all 0.2s;
}

li {
  margin: 8px 0;
}

h2 {
  font-weight: bold;
  margin-bottom: 15px;
}

del {
  color: rgba(0, 0, 0, 0.3);
}

Vue

new Vue({
  el: "#app",
  data() {
    return{
     roomTime: '',
    }
  },
  mounted: function(){
  var timeValue = '65';
  console.log(moment().startOf('day')
    .seconds(timeValue)
    .format('mm:ss'));
  	
    console.log(timeValue);
    var formatTime = moment(timeValue).format("MM:SS");
    /** How to make 65 to be display as 01:05 **/
 
    this.roomTime = formatTime;
  },
  methods: {
  	toggle: function(todo){
    	todo.done = !todo.done
    }
  }
})