title: Pikaday : Modify month or year without click a date
body: <p>When I choose a date, I want to modify it.
  I try to change the date in the input when I select a month or a year without to select a day.
  I don't find solution.
  Thanks</p>
  
  <p>HTML</p>
  
  <pre><code>&lt;style&gt;
      div.pika-label:hover{
      color:#ff9705;
  }
  &lt;/style&gt;
  &lt;input type="text" name="start_date" id="start_date"&gt;
  &lt;input type="text" name="end_date"   id="end_date"  &gt;
  </code></pre>
  
  <p>JS</p>
  
  <pre><code>var start_date = new Pikaday({
      format: 'DD / MM / YYYY',
      field: document.getElementById('start_date'),
      onSelect: function() {
          end_date.setMinDate(this.getDate());
      }
  });
  var end_date = new Pikaday({
      format: 'DD / MM / YYYY',
      field: document.getElementById('end_date'),
      onSelect: function() {
          start_date.setMaxDate(this.getDate());
      }
  });
  // I want to collect month data and create a new date with Pikaday.setDate()
  jQuery('.pika-select-month').on('change', function() {
    alert(this.value);
  });
  </code></pre>
  
  <p><a href="http://jsfiddle.net/madvic/nqakkru1/10/" rel="nofollow">http://jsfiddle.net/madvic/nqakkru1/10/</a></p>