title: how convert unixtime to yy-mm-dd
body: <p>I've been searching how to convert UNIXTIME to YY-MM-DD format using javascript, but so far I've only found methods to do it the other way around (YY-MM-DD to UNIXTIME).</p>
  
  <p>Is there any method already incorporated in jquery or something to do this work?</p>
  
  <p>Thanks!!</p>