title: How do I calculate a total time
body: <p>I am developing a web-based application to capture total time of playlist of video. my main problem is that I don't know how can I calculate the total time from an array e.g: 30:00 + 30:00 = 01:00. Time is in mm:ss output I need in hh:mm</p>
  
  <pre><code>var time = ["13:24", "4:28", "7:29"];
  
  for (k in time){
      add(time[k].split(":"));
  }
  </code></pre>