Change dateFormat in beforeShowDay in the Datepicker UI

Change dateFormat in beforeShowDay in the Datepicker UI

Hi, please help me

I have an array of the dates:
    
  1. <?php
  2. $seq = array("2016-6-27", "2016-6-28", "2016-6-29", "2016-6-30");
  3. $json = json_encode($seq);
  4. ?>
and script witch marked dates in the datepicker:
     
  1. <script type = "text/javascript">
  2. var disabledDays = <?php echo $json;?>;
  3. var date = new Date();
  4. jQuery(document).ready(function() {
  5.  $( "#datepicker").datepicker({
  6.  beforeShowDay: function(date) {
  7.  var m = date.getMonth(), 
  8.  d = date.getDate(), 
  9.  y = date.getFullYear();
  10.  for (i = 0; i < disabledDays.length; i++) {
  11.  if($.inArray(y + '-' + (m+1) + '-' 
  12.  + d,disabledDays) != -1) {
  13.  //return [false];
  14.  return [true, 'ui-state-active', ''];
  15.  }
  16.  }
  17.  return [true];
  18.  }
  19.  });
  20. });
  21. </script>
its work,
but how change script
 
if I want use this 
array of the dates:
     
  1.  
    <?php
  2. $seq = array("06-27-
    2016
    ", "06-28
    -
    2016
    ", 
  3. "06-29
    -
    2016
    ", "06-30
    -
    2016
    ");
  4. $json = json_encode($seq);
  5. ?>