datepicker.js

  var holidays =[]
  //holiday model ruby, table that save all the holidays federal
  holidays = "<%= Holiday.all.map{ |h| h.date.strftime("%Y-%m-%d") } %>";
  /*example "2015-10-12", "2015-11-02", "2015-11-16", "2015-12-08", "2015-12-25", "2016-01-01", 
  "2016-01-11", "2016-03-21", "2016-03-24", "2016-03-25", "2016-05-01", "2016-05-09", "2016-05-30",
  "2016-06-06", "2016-07-04", "2016-07-20", "2016-08-07", "2016-08-15", "2016-10-17", "2016-11-07", 
  "2016-11-14", "2016-12-08", "2016-12-25"]*/

                    
  $('.date').datepicker({
    startDate: start_date
    language: "es",
    autoclose: true,
    daysOfWeekDisabled: [0,6], //disable weekend
    beforeShowDay:function(Date){
      var curr_date = Date.toJSON().substring(0,10);
      if (holidays.indexOf(curr_date)>-1) return false;
    }//Disable days holidays federal
  });