title: Set all months in a list or map along with years
body: <p>I want to set a list or map which ever is preferable,
  I'll get a month and a year as input,for example
  consider input is 
  <code>
  Feb-2015
  </code>
  then a list or map must contain months and year for next 12 months.
  Like
  <code>
  feb-2015
  march-2015
  apr-2015
  may-215....
  </code>till
  <code>
  feb-2016
  </code></p>
  
  <p>How to set a map or list in the above mentioned manner?</p>