title: How do I get the DST amount from MomentJS
body: <p>Is there a way to get the amount of time for a DST transition.  For example there are some odd Timezones out there that have a 30 minute transition.  Another way for me to get this is to get the utc offsets for standard and dst time and I can subtract the two.</p>
  
  <p>If I do moment.tz('America/Chicago')._z.offsets I can access a large array of all the offsets.  However I need to know which index into the array is for the current year.</p>
  
  <p>Any thoughts? </p>