JS - Persian Symbols

HTML

<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/bootstrap-datepicker/1.3.0/css/datepicker3.css">
<div id="sandbox-container">
  <input type="text" type="text" class="form-control" />
</div>

JavaScript

(function($, undefined) {

  var $window = $(window);

  function convert(num) {

    var persian = {
      0: '۰',
      1: '۱',
      2: '۲',
      3: '۳',
      4: '۴',
      5: '۵',
      6: '۶',
      7: '۷',
      8: '۸',
      9: '۹'
    };

    var out = '';
    for (i = 0; i < num.length; i++) {
      out = out + persian[num[i]];
    }

    return out;
  }

  function UTCDate() {
    return new Date(Date.UTC.apply(Date, arguments));
  }

  function UTCToday() {
    var today = new Date();
    return UTCDate(today.getFullYear(), today.getMonth(), today.getDate());
  }

  function alias(method) {
    return function() {
      return this[method].apply(this, arguments);
    };
  }

  var DateArray = (function() {
    var extras = {
      get: function(i) {
        return this.slice(i)[0];
      },
      contains: function(d) {
        // Array.indexOf is not cross-browser;
        // $.inArray doesn't work with Dates
        var val = d && d.valueOf();
        for (var i = 0, l = this.length; i < l; i++)
          if (this[i].valueOf() === val)
            return i;
        return -1;
      },
      remove: function(i) {
        this.splice(i, 1);
      },
      replace: function(new_array) {
        if (!new_array)
          return;
        if (!$.isArray(new_array))
          new_array = [new_array];
        this.clear();
        this.push.apply(this, new_array);
      },
      clear: function() {
        this.splice(0);
      },
      copy: function() {
        var a = new DateArray();
        a.replace(this);
        return a;
      }
    };

    return function() {
      var a = [];
      a.push.apply(a, arguments);
      $.extend(a, extras);
      return a;
    };
  })();


  // Picker object

  var Datepicker = function(element, options) {
    this.dates = new DateArray();
    this.viewDate = UTCToday();
    this.focusDate = null;

    this._process_options(options);

    this.element = $(element);
    this.isInline = false;
    this.isInput =...