title: Convert specific date & time based on user location to utc date & time
body: <p>I am working on a JavaScript based application. In my application, we have built a list from which user can select a time. </p>
  
  <p>The list looks like <a href="http://i.stack.imgur.com/7HOPp.png" rel="nofollow">this</a></p>
  
  <p>Once the user selects a time from the list, based on todays date, I need to convert the date (which is today's date) and the time picked by user into UTC time. </p>
  
  <p>There are tons of post which talks about converting date time into UTC but each having its pros &amp; cons. Some of the post are old and JavaScript is evolving everyday. </p>
  
  <p>I need to take users location into consideration while converting the date. I will assume what ever location/timezone set on user machine as the right location / timezone. </p>