$(function(){
    function get2digits (num){
      return ('0' + num).slice(-2);
    }
  
    function getDate(dateObj){
      if(dateObj instanceof Date)
        return dateObj.getFullYear() + '-' + get2digits(dateObj.getMonth()+1)+ '-' + get2digits(dateObj.getDate());
    }
  
    function getTime(dateObj){
      if(dateObj instanceof Date)
        return get2digits(dateObj.getHours()) + ':' + get2digits(dateObj.getMinutes())+ ':' + get2digits(dateObj.getSeconds());
    }
  
    function convertDate(){
      $('[data-date]').each(function(index,element){
        var dateString = $(element).data('date');
        if(dateString){
          var date = new Date(dateString);
          $(element).html(getDate(date));
        }
      });
    }
  
    function convertDateTime(){
      $('[data-date-time]').each(function(index,element){
        var dateString = $(element).data('date-time');
        if(dateString){
          var date = new Date(dateString);
          $(element).html(getDate(date)+' '+getTime(date));
        }
      });
    }
  
    convertDate();
    convertDateTime();
  });