title: Convert HH:MM:SS to seconds in momentjs
body: <p>I have a string with <code>12</code> hour formatted time only</p>
  
  <p><code>var time="12:10:12: PM"</code> </p>
  
  <p>I want to convert this string to seconds. </p>
  
  <p>how can i do this in <code>moment.js</code>? </p>