/*!
 * Datepicker for Bootstrap v1.7.0-dev (https://github.com/uxsolutions/bootstrap-datepicker)
 *
 * Licensed under the Apache License v2.0 (http://www.apache.org/licenses/LICENSE-2.0)
 */

(function(factory) {
  if (typeof define === "function" && define.amd) {
    define(["jquery"], factory);
  } else if (typeof exports === 'object') {
    factory(require('jquery'));
  } else {
    factory(jQuery);
  }
}(function($, undefined) {
  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 isUTCEquals(date1, date2) {
    return (
      date1.getUTCFullYear() === date2.getUTCFullYear() &&
      date1.getUTCMonth() === date2.getUTCMonth() &&
      date1.getUTCDate() === date2.getUTCDate()
    );
  }

  function alias(method, deprecationMsg) {
    return function() {
      if (deprecationMsg !== undefined) {
        $.fn.datepicker.deprecated(deprecationMsg);
      }

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

  function isValidDate(d) {
    return d && !isNaN(d.getTime());
  }

  var DateArray = (function() {
    var extras = {
      get: function(i) {
        return this.slice(i)[0];
      },
      contains: function(d) {
        // Array.indexOf is not cross-browser;
        // $.inArray doesn't work with Dates
        var val = d && d.valueOf();
        for (var i = 0, l = this.length; i < l; i++)
          // Use date arithmetic to allow dates with different times to match
          if (0 <= this[i].valueOf() - val && this[i].valueOf() - val < 1000 * 60 * 60 * 24)
            return i;
        return -1;
      },
      remove: function(i) {
        this.splice(i, 1);
      },
      replace: function(new_array) {
        if (!new_array)
          return;
        if (!$.isArray(new_array))
          new_array = [new_array];
        this.clear();
        this.push.apply(this, new_array);
      },
      clear: function() {
        this.length = 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) {
    $.data(element, 'datepicker', this);
    this._process_options(options);

    this.dates = new DateArray();
    this.viewDate = this.o.defaultViewDate;
    this.focusDate = null;

    this.element = $(element);
    this.isInput = this.element.is('input');
    this.inputField = this.isInput ? this.element : this.element.find('input');
    this.component = this.element.hasClass('date') ? this.element.find('.add-on, .input-group-addon, .btn') : false;
    if (this.component && this.component.length === 0)
      this.component = false;
    this.isInline = !this.component && this.element.is('div');

    this.picker = $(DPGlobal.template);

    // Checking templates and inserting
    if (this._check_template(this.o.templates.leftArrow)) {
      this.picker.find('.prev').html(this.o.templates.leftArrow);
    }

    if (this._check_template(this.o.templates.rightArrow)) {
      this.picker.find('.next').html(this.o.templates.rightArrow);
    }

    this._buildEvents();
    this._attachEvents();

    if (this.isInline) {
      this.picker.addClass('datepicker-inline').appendTo(this.element);
    } else {
      this.picker.addClass('datepicker-dropdown dropdown-menu');
    }

    if (this.o.rtl) {
      this.picker.addClass('datepicker-rtl');
    }

    if (this.o.calendarWeeks) {
      this.picker.find('.datepicker-days .datepicker-switch, thead .datepicker-title, tfoot .today, tfoot .clear')
        .attr('colspan', function(i, val) {
          return Number(val) + 1;
        });
    }

    this._process_options({
      startDate: this._o.startDate,
      endDate: this._o.endDate,
      daysOfWeekDisabled: this.o.daysOfWeekDisabled,
      daysOfWeekHighlighted: this.o.daysOfWeekHighlighted,
      datesDisabled: this.o.datesDisabled
    });

    this._allow_update = false;
    this.setViewMode(this.o.startView);
    this._allow_update = true;

    this.fillDow();
    this.fillMonths();

    this.update();

    if (this.isInline) {
      this.show();
    }
  };

  Datepicker.prototype = {
    constructor: Datepicker,

    _resolveViewName: function(view) {
      $.each(DPGlobal.viewModes, function(i, viewMode) {
        if (view === i || $.inArray(view, viewMode.names) !== -1) {
          view = i;
          return false;
        }
      });

      return view;
    },

    _resolveDaysOfWeek: function(daysOfWeek) {
      if (!$.isArray(daysOfWeek))
        daysOfWeek = daysOfWeek.split(/[,\s]*/);
      return $.map(daysOfWeek, Number);
    },

    _check_template: function(tmp) {
      try {
        // If empty
        if (tmp === undefined || tmp === "") {
          return false;
        }
        // If no html, everything ok
        if ((tmp.match(/[<>]/g) || []).length <= 0) {
          return true;
        }
        // Checking if html is fine
        var jDom = $(tmp);
        return jDom.length > 0;
      } catch (ex) {
        return false;
      }
    },

    _process_options: function(opts) {
      // Store raw options for reference
      this._o = $.extend({}, this._o, opts);
      // Processed options
      var o = this.o = $.extend({}, this._o);

      // Check if "de-DE" style date is available, if not language should
      // fallback to 2 letter code eg "de"
      var lang = o.language;
      if (!dates[lang]) {
        lang = lang.split('-')[0];
        if (!dates[lang])
          lang = defaults.language;
      }
      o.language = lang;

      // Retrieve view index from any aliases
      o.startView = this._resolveViewName(o.startView);
      o.minViewMode = this._resolveViewName(o.minViewMode);
      o.maxViewMode = this._resolveViewName(o.maxViewMode);

      // Check view is between min and max
      o.startView = Math.max(this.o.minViewMode, Math.min(this.o.maxViewMode, o.startView));

      // true, false, or Number > 0
      if (o.multidate !== true) {
        o.multidate = Number(o.multidate) || false;
        if (o.multidate !== false)
          o.multidate = Math.max(0, o.multidate);
      }
      o.multidateSeparator = String(o.multidateSeparator);

      o.weekStart %= 7;
      o.weekEnd = (o.weekStart + 6) % 7;

      var format = DPGlobal.parseFormat(o.format);
      if (o.startDate !== -Infinity) {
        if (!!o.startDate) {
          if (o.startDate instanceof Date)
            o.startDate = this._local_to_utc(this._zero_time(o.startDate));
          else
            o.startDate = DPGlobal.parseDate(o.startDate, format, o.language, o.assumeNearbyYear);
        } else {
          o.startDate = -Infinity;
        }
      }
      if (o.endDate !== Infinity) {
        if (!!o.endDate) {
          if (o.endDate instanceof Date)
            o.endDate = this._local_to_utc(this._zero_time(o.endDate));
          else
            o.endDate = DPGlobal.parseDate(o.endDate, format, o.language, o.assumeNearbyYear);
        } else {
          o.endDate = Infinity;
        }
      }

      o.daysOfWeekDisabled = this._resolveDaysOfWeek(o.daysOfWeekDisabled || []);
      o.daysOfWeekHighlighted = this._resolveDaysOfWeek(o.daysOfWeekHighlighted || []);

      o.datesDisabled = o.datesDisabled || [];
      if (!$.isArray(o.datesDisabled)) {
        o.datesDisabled = o.datesDisabled.split(',');
      }
      o.datesDisabled = $.map(o.datesDisabled, function(d) {
        return DPGlobal.parseDate(d, format, o.language, o.assumeNearbyYear);
      });

      var plc = String(o.orientation).toLowerCase().split(/\s+/g),
        _plc = o.orientation.toLowerCase();
      plc = $.grep(plc, function(word) {
        return /^auto|left|right|top|bottom$/.test(word);
      });
      o.orientation = {
        x: 'auto',
        y: 'auto'
      };
      if (!_plc || _plc === 'auto')
      ; // no action
      else if (plc.length === 1) {
        switch (plc[0]) {
          case 'top':
          case 'bottom':
            o.orientation.y = plc[0];
            break;
          case 'left':
          case 'right':
            o.orientation.x = plc[0];
            break;
        }
      } else {
        _plc = $.grep(plc, function(word) {
          return /^left|right$/.test(word);
        });
        o.orientation.x = _plc[0] || 'auto';

        _plc = $.grep(plc, function(word) {
          return /^top|bottom$/.test(word);
        });
        o.orientation.y = _plc[0] || 'auto';
      }
      if (o.defaultViewDate instanceof Date || typeof o.defaultViewDate === 'string') {
        o.defaultViewDate = DPGlobal.parseDate(o.defaultViewDate, format, o.language, o.assumeNearbyYear);
      } else if (o.defaultViewDate) {
        var year = o.defaultViewDate.year || new Date().getFullYear();
        var month = o.defaultViewDate.month || 0;
        var day = o.defaultViewDate.day || 1;
        o.defaultViewDate = UTCDate(year, month, day);
      } else {
        o.defaultViewDate = UTCToday();
      }
    },
    _events: [],
    _secondaryEvents: [],
    _applyEvents: function(evs) {
      for (var i = 0, el, ch, ev; i < evs.length; i++) {
        el = evs[i][0];
        if (evs[i].length === 2) {
          ch = undefined;
          ev = evs[i][1];
        } else if (evs[i].length === 3) {
          ch = evs[i][1];
          ev = evs[i][2];
        }
        el.on(ev, ch);
      }
    },
    _unapplyEvents: function(evs) {
      for (var i = 0, el, ev, ch; i < evs.length; i++) {
        el = evs[i][0];
        if (evs[i].length === 2) {
          ch = undefined;
          ev = evs[i][1];
        } else if (evs[i].length === 3) {
          ch = evs[i][1];
          ev = evs[i][2];
        }
        el.off(ev, ch);
      }
    },
    _buildEvents: function() {
      var events = {
        keyup: $.proxy(function(e) {
          if ($.inArray(e.keyCode, [27, 37, 39, 38, 40, 32, 13, 9]) === -1)
            this.update();
        }, this),
        keydown: $.proxy(this.keydown, this),
        paste: $.proxy(this.paste, this)
      };

      if (this.o.showOnFocus === true) {
        events.focus = $.proxy(this.show, this);
      }

      if (this.isInput) { // single input
        this._events = [
          [this.element, events]
        ];
      }
      // component: input + button
      else if (this.component && this.inputField.length) {
        this._events = [
          // For components that are not readonly, allow keyboard nav
          [this.inputField, events],
          [this.component, {
            click: $.proxy(this.show, this)
          }]
        ];
      } else {
        this._events = [
          [this.element, {
            click: $.proxy(this.show, this),
            keydown: $.proxy(this.keydown, this)
          }]
        ];
      }
      this._events.push(
        // Component: listen for blur on element descendants
        [this.element, '*', {
          blur: $.proxy(function(e) {
            this._focused_from = e.target;
          }, this)
        }],
        // Input: listen for blur on element
        [this.element, {
          blur: $.proxy(function(e) {
            this._focused_from = e.target;
          }, this)
        }]
      );

      if (this.o.immediateUpdates) {
        // Trigger input updates immediately on changed year/month
        this._events.push([this.element, {
          'changeYear changeMonth': $.proxy(function(e) {
            this.update(e.date);
          }, this)
        }]);
      }

      this._secondaryEvents = [
        [this.picker, {
          click: $.proxy(this.click, this)
        }],
        [this.picker, '.prev, .next', {
          click: $.proxy(this.navArrowsClick, this)
        }],
        [$(window), {
          resize: $.proxy(this.place, this)
        }],
        [$(document), {
          'mousedown touchstart': $.proxy(function(e) {
            // Clicked outside the datepicker, hide it
            if (!(
                this.element.is(e.target) ||
                this.element.find(e.target).length ||
                this.picker.is(e.target) ||
                this.picker.find(e.target).length ||
                this.isInline
              )) {
              this.hide();
            }
          }, this)
        }]
      ];
    },
    _attachEvents: function() {
      this._detachEvents();
      this._applyEvents(this._events);
    },
    _detachEvents: function() {
      this._unapplyEvents(this._events);
    },
    _attachSecondaryEvents: function() {
      this._detachSecondaryEvents();
      this._applyEvents(this._secondaryEvents);
    },
    _detachSecondaryEvents: function() {
      this._unapplyEvents(this._secondaryEvents);
    },
    _trigger: function(event, altdate) {
      var date = altdate || this.dates.get(-1),
        local_date = this._utc_to_local(date);

      this.element.trigger({
        type: event,
        date: local_date,
        viewMode: this.viewMode,
        dates: $.map(this.dates, this._utc_to_local),
        format: $.proxy(function(ix, format) {
          if (arguments.length === 0) {
            ix = this.dates.length - 1;
            format = this.o.format;
          } else if (typeof ix === 'string') {
            format = ix;
            ix = this.dates.length - 1;
          }
          format = format || this.o.format;
          var date = this.dates.get(ix);
          return DPGlobal.formatDate(date, format, this.o.language);
        }, this)
      });
    },

    show: function() {
      if (this.inputField.prop('disabled') || (this.inputField.prop('readonly') && this.o.enableOnReadonly === false))
        return;
      if (!this.isInline)
        this.picker.appendTo(this.o.container);
      this.place();
      this.picker.show();
      this._attachSecondaryEvents();
      this._trigger('show');
      if ((window.navigator.msMaxTouchPoints || 'ontouchstart' in document) && this.o.disableTouchKeyboard) {
        $(this.element).blur();
      }
      return this;
    },

    hide: function() {
      if (this.isInline || !this.picker.is(':visible'))
        return this;
      this.focusDate = null;
      this.picker.hide().detach();
      this._detachSecondaryEvents();
      this.setViewMode(this.o.startView);

      if (this.o.forceParse && this.inputField.val())
        this.setValue();
      this._trigger('hide');
      return this;
    },

    destroy: function() {
      this.hide();
      this._detachEvents();
      this._detachSecondaryEvents();
      this.picker.remove();
      delete this.element.data().datepicker;
      if (!this.isInput) {
        delete this.element.data().date;
      }
      return this;
    },

    paste: function(e) {
      var dateString;
      if (e.originalEvent.clipboardData && e.originalEvent.clipboardData.types &&
        $.inArray('text/plain', e.originalEvent.clipboardData.types) !== -1) {
        dateString = e.originalEvent.clipboardData.getData('text/plain');
      } else if (window.clipboardData) {
        dateString = window.clipboardData.getData('Text');
      } else {
        return;
      }
      this.setDate(dateString);
      this.update();
      e.preventDefault();
    },

    _utc_to_local: function(utc) {
      if (!utc) {
        return utc;
      }

      var local = new Date(utc.getTime() + (utc.getTimezoneOffset() * 60000));

      if (local.getTimezoneOffset() !== utc.getTimezoneOffset()) {
        local = new Date(utc.getTime() + (local.getTimezoneOffset() * 60000));
      }

      return local;
    },
    _local_to_utc: function(local) {
      return local && new Date(local.getTime() - (local.getTimezoneOffset() * 60000));
    },
    _zero_time: function(local) {
      return local && new Date(local.getFullYear(), local.getMonth(), local.getDate());
    },
    _zero_utc_time: function(utc) {
      return utc && UTCDate(utc.getUTCFullYear(), utc.getUTCMonth(), utc.getUTCDate());
    },

    getDates: function() {
      return $.map(this.dates, this._utc_to_local);
    },

    getUTCDates: function() {
      return $.map(this.dates, function(d) {
        return new Date(d);
      });
    },

    getDate: function() {
      return this._utc_to_local(this.getUTCDate());
    },

    getUTCDate: function() {
      var selected_date = this.dates.get(-1);
      if (selected_date !== undefined) {
        return new Date(selected_date);
      } else {
        return null;
      }
    },

    clearDates: function() {
      this.inputField.val('');
      this.update();
      this._trigger('changeDate');

      if (this.o.autoclose) {
        this.hide();
      }
    },

    setDates: function() {
      var args = $.isArray(arguments[0]) ? arguments[0] : arguments;
      this.update.apply(this, args);
      this._trigger('changeDate');
      this.setValue();
      return this;
    },

    setUTCDates: function() {
      var args = $.isArray(arguments[0]) ? arguments[0] : arguments;
      this.setDates.apply(this, $.map(args, this._utc_to_local));
      return this;
    },

    setDate: alias('setDates'),
    setUTCDate: alias('setUTCDates'),
    remove: alias('destroy', 'Method `remove` is deprecated and will be removed in version 2.0. Use `destroy` instead'),

    setValue: function() {
      var formatted = this.getFormattedDate();
      this.inputField.val(formatted);
      return this;
    },

    getFormattedDate: function(format) {
      if (format === undefined)
        format = this.o.format;

      var lang = this.o.language;
      return $.map(this.dates, function(d) {
        return DPGlobal.formatDate(d, format, lang);
      }).join(this.o.multidateSeparator);
    },

    getStartDate: function() {
      return this.o.startDate;
    },

    setStartDate: function(startDate) {
      this._process_options({
        startDate: startDate
      });
      this.update();
      this.updateNavArrows();
      return this;
    },

    getEndDate: function() {
      return this.o.endDate;
    },

    setEndDate: function(endDate) {
      this._process_options({
        endDate: endDate
      });
      this.update();
      this.updateNavArrows();
      return this;
    },

    setDaysOfWeekDisabled: function(daysOfWeekDisabled) {
      this._process_options({
        daysOfWeekDisabled: daysOfWeekDisabled
      });
      this.update();
      return this;
    },

    setDaysOfWeekHighlighted: function(daysOfWeekHighlighted) {
      this._process_options({
        daysOfWeekHighlighted: daysOfWeekHighlighted
      });
      this.update();
      return this;
    },

    setDatesDisabled: function(datesDisabled) {
      this._process_options({
        datesDisabled: datesDisabled
      });
      this.update();
      return this;
    },

    place: function() {
      if (this.isInline)
        return this;
      var calendarWidth = this.picker.outerWidth(),
        calendarHeight = this.picker.outerHeight(),
        visualPadding = 10,
        container = $(this.o.container),
        windowWidth = container.width(),
        scrollTop = this.o.container === 'body' ? $(document).scrollTop() : container.scrollTop(),
        appendOffset = container.offset();

      var parentsZindex = [0];
      this.element.parents().each(function() {
        var itemZIndex = $(this).css('z-index');
        if (itemZIndex !== 'auto' && Number(itemZIndex) !== 0) parentsZindex.push(Number(itemZIndex));
      });
      var zIndex = Math.max.apply(Math, parentsZindex) + this.o.zIndexOffset;
      var offset = this.component ? this.component.parent().offset() : this.element.offset();
      var height = this.component ? this.component.outerHeight(true) : this.element.outerHeight(false);
      var width = this.component ? this.component.outerWidth(true) : this.element.outerWidth(false);
      var left = offset.left - appendOffset.left;
      var top = offset.top - appendOffset.top;

      if (this.o.container !== 'body') {
        top += scrollTop;
      }

      this.picker.removeClass(
        'datepicker-orient-top datepicker-orient-bottom ' +
        'datepicker-orient-right datepicker-orient-left'
      );

      if (this.o.orientation.x !== 'auto') {
        this.picker.addClass('datepicker-orient-' + this.o.orientation.x);
        if (this.o.orientation.x === 'right')
          left -= calendarWidth - width;
      }
      // auto x orientation is best-placement: if it crosses a window
      // edge, fudge it sideways
      else {
        if (offset.left < 0) {
          // component is outside the window on the left side. Move it into visible range
          this.picker.addClass('datepicker-orient-left');
          left -= offset.left - visualPadding;
        } else if (left + calendarWidth > windowWidth) {
          // the calendar passes the widow right edge. Align it to component right side
          this.picker.addClass('datepicker-orient-right');
          left += width - calendarWidth;
        } else {
          if (this.o.rtl) {
            // Default to right
            this.picker.addClass('datepicker-orient-right');
          } else {
            // Default to left
            this.picker.addClass('datepicker-orient-left');
          }
        }
      }

      // auto y orientation is best-situation: top or bottom, no fudging,
      // decision based on which shows more of the calendar
      var yorient = this.o.orientation.y,
        top_overflow;
      if (yorient === 'auto') {
        top_overflow = -scrollTop + top - calendarHeight;
        yorient = top_overflow < 0 ? 'bottom' : 'top';
      }

      this.picker.addClass('datepicker-orient-' + yorient);
      if (yorient === 'top')
        top -= calendarHeight + parseInt(this.picker.css('padding-top'));
      else
        top += height;

      if (this.o.rtl) {
        var right = windowWidth - (left + width);
        this.picker.css({
          top: top,
          right: right,
          zIndex: zIndex
        });
      } else {
        this.picker.css({
          top: top,
          left: left,
          zIndex: zIndex
        });
      }
      return this;
    },

    _allow_update: true,
    update: function() {
      if (!this._allow_update)
        return this;

      var oldDates = this.dates.copy(),
        dates = [],
        fromArgs = false;
      if (arguments.length) {
        $.each(arguments, $.proxy(function(i, date) {
          if (date instanceof Date)
            date = this._local_to_utc(date);
          dates.push(date);
        }, this));
        fromArgs = true;
      } else {
        dates = this.isInput ?
          this.element.val() :
          this.element.data('date') || this.inputField.val();
        if (dates && this.o.multidate)
          dates = dates.split(this.o.multidateSeparator);
        else
          dates = [dates];
        delete this.element.data().date;
      }

      dates = $.map(dates, $.proxy(function(date) {
        return DPGlobal.parseDate(date, this.o.format, this.o.language, this.o.assumeNearbyYear);
      }, this));
      dates = $.grep(dates, $.proxy(function(date) {
        return (!this.dateWithinRange(date) ||
          !date
        );
      }, this), true);
      this.dates.replace(dates);

      if (this.o.updateViewDate) {
        if (this.dates.length)
          this.viewDate = new Date(this.dates.get(-1));
        else if (this.viewDate < this.o.startDate)
          this.viewDate = new Date(this.o.startDate);
        else if (this.viewDate > this.o.endDate)
          this.viewDate = new Date(this.o.endDate);
        else
          this.viewDate = this.o.defaultViewDate;
      }

      if (fromArgs) {
        // setting date by clicking
        this.setValue();
        this.element.change();
      } else if (this.dates.length) {
        // setting date by typing
        if (typeof this.o.format === 'string') {
          if ((String(this.element[0].value).length === String(this.o.format).length) && (String(oldDates) !== String(this.dates)))
            this._trigger('changeDate');
          this.element.change();
        } else if (String(oldDates) !== String(this.dates)) {
          this._trigger('changeDate');
          this.element.change();
        }
      }
      if (!this.dates.length && oldDates.length) {
        this._trigger('clearDate');
        this.element.change();
      }

      this.fill();
      return this;
    },

    fillDow: function() {
      var dowCnt = this.o.weekStart,
        html = '<tr>';
      if (this.o.calendarWeeks) {
        html += '<th class="cw">&#160;</th>';
      }
      while (dowCnt < this.o.weekStart + 7) {
        html += '<th class="dow';
        if ($.inArray(dowCnt, this.o.daysOfWeekDisabled) !== -1)
          html += ' disabled';
        html += '">' + dates[this.o.language].daysMin[(dowCnt++) % 7] + '</th>';
      }
      html += '</tr>';
      this.picker.find('.datepicker-days thead').append(html);
    },

    fillMonths: function() {
      var localDate = this._utc_to_local(this.viewDate);
      var html = '';
      var focused;
      for (var i = 0; i < 12; i++) {
        focused = localDate && localDate.getMonth() === i ? ' focused' : '';
        html += '<span class="month' + focused + '">' + dates[this.o.language].monthsShort[i] + '</span>';
      }
      this.picker.find('.datepicker-months td').html(html);
    },

    setRange: function(range) {
      if (!range || !range.length)
        delete this.range;
      else
        this.range = $.map(range, function(d) {
          return d.valueOf();
        });
      this.fill();
    },

    getClassNames: function(date) {
      var cls = [],
        year = this.viewDate.getUTCFullYear(),
        month = this.viewDate.getUTCMonth(),
        today = UTCToday();
      if (date.getUTCFullYear() < year || (date.getUTCFullYear() === year && date.getUTCMonth() < month)) {
        cls.push('old');
      } else if (date.getUTCFullYear() > year || (date.getUTCFullYear() === year && date.getUTCMonth() > month)) {
        cls.push('new');
      }
      if (this.focusDate && date.valueOf() === this.focusDate.valueOf())
        cls.push('focused');
      // Compare internal UTC date with UTC today, not local today
      if (this.o.todayHighlight && isUTCEquals(date, today)) {
        cls.push('today');
      }
      if (this.dates.contains(date) !== -1)
        cls.push('active');
      if (!this.dateWithinRange(date)) {
        cls.push('disabled');
      }
      if (this.dateIsDisabled(date)) {
        cls.push('disabled', 'disabled-date');
      }
      if ($.inArray(date.getUTCDay(), this.o.daysOfWeekHighlighted) !== -1) {
        cls.push('highlighted');
      }

      if (this.range) {
        if (date > this.range[0] && date < this.range[this.range.length - 1]) {
          cls.push('range');
        }
        if ($.inArray(date.valueOf(), this.range) !== -1) {
          cls.push('selected');
        }
        if (date.valueOf() === this.range[0]) {
          cls.push('range-start');
        }
        if (date.valueOf() === this.range[this.range.length - 1]) {
          cls.push('range-end');
        }
      }
      return cls;
    },

    _fill_yearsView: function(selector, cssClass, factor, year, startYear, endYear, beforeFn) {
      var html = '';
      var step = factor / 10;
      var view = this.picker.find(selector);
      var startVal = Math.floor(year / factor) * factor;
      var endVal = startVal + step * 9;
      var focusedVal = Math.floor(this.viewDate.getFullYear() / step) * step;
      var selected = $.map(this.dates, function(d) {
        return Math.floor(d.getUTCFullYear() / step) * step;
      });

      var classes, tooltip, before;
      for (var currVal = startVal - step; currVal <= endVal + step; currVal += step) {
        classes = [cssClass];
        tooltip = null;

        if (currVal === startVal - step) {
          classes.push('old');
        } else if (currVal === endVal + step) {
          classes.push('new');
        }
        if ($.inArray(currVal, selected) !== -1) {
          classes.push('active');
        }
        if (currVal < startYear || currVal > endYear) {
          classes.push('disabled');
        }
        if (currVal === focusedVal) {
          classes.push('focused');
        }

        if (beforeFn !== $.noop) {
          before = beforeFn(new Date(currVal, 0, 1));
          if (before === undefined) {
            before = {};
          } else if (typeof before === 'boolean') {
            before = {
              enabled: before
            };
          } else if (typeof before === 'string') {
            before = {
              classes: before
            };
          }
          if (before.enabled === false) {
            classes.push('disabled');
          }
          if (before.classes) {
            classes = classes.concat(before.classes.split(/\s+/));
          }
          if (before.tooltip) {
            tooltip = before.tooltip;
          }
        }

        html += '<span class="' + classes.join(' ') + '"' + (tooltip ? ' title="' + tooltip + '"' : '') + '>' + currVal + '</span>';
      }

      view.find('.datepicker-switch').text(startVal + '-' + endVal);
      view.find('td').html(html);
    },

    fill: function() {
      var d = new Date(this.viewDate),
        year = d.getUTCFullYear(),
        month = d.getUTCMonth(),
        startYear = this.o.startDate !== -Infinity ? this.o.startDate.getUTCFullYear() : -Infinity,
        startMonth = this.o.startDate !== -Infinity ? this.o.startDate.getUTCMonth() : -Infinity,
        endYear = this.o.endDate !== Infinity ? this.o.endDate.getUTCFullYear() : Infinity,
        endMonth = this.o.endDate !== Infinity ? this.o.endDate.getUTCMonth() : Infinity,
        todaytxt = dates[this.o.language].today || dates['en'].today || '',
        cleartxt = dates[this.o.language].clear || dates['en'].clear || '',
        titleFormat = dates[this.o.language].titleFormat || dates['en'].titleFormat,
        tooltip,
        before;
      if (isNaN(year) || isNaN(month))
        return;
      this.picker.find('.datepicker-days .datepicker-switch')
        .text(DPGlobal.formatDate(d, titleFormat, this.o.language));
      this.picker.find('tfoot .today')
        .text(todaytxt)
        .toggle(this.o.todayBtn !== false);
      this.picker.find('tfoot .clear')
        .text(cleartxt)
        .toggle(this.o.clearBtn !== false);
      this.picker.find('thead .datepicker-title')
        .text(this.o.title)
        .toggle(this.o.title !== '');
      this.updateNavArrows();
      this.fillMonths();
      var prevMonth = UTCDate(year, month, 0),
        day = prevMonth.getUTCDate();
      prevMonth.setUTCDate(day - (prevMonth.getUTCDay() - this.o.weekStart + 7) % 7);
      var nextMonth = new Date(prevMonth);
      if (prevMonth.getUTCFullYear() < 100) {
        nextMonth.setUTCFullYear(prevMonth.getUTCFullYear());
      }
      nextMonth.setUTCDate(nextMonth.getUTCDate() + 42);
      nextMonth = nextMonth.valueOf();
      var html = [];
      var weekDay, clsName;
      while (prevMonth.valueOf() < nextMonth) {
        weekDay = prevMonth.getUTCDay();
        if (weekDay === this.o.weekStart) {
          html.push('<tr>');
          if (this.o.calendarWeeks) {
            // ISO 8601: First week contains first thursday.
            // ISO also states week starts on Monday, but we can be more abstract here.
            var
              // Start of current week: based on weekstart/current date
              ws = new Date(+prevMonth + (this.o.weekStart - weekDay - 7) % 7 * 864e5),
              // Thursday of this week
              th = new Date(Number(ws) + (7 + 4 - ws.getUTCDay()) % 7 * 864e5),
              // First Thursday of year, year from thursday
              yth = new Date(Number(yth = UTCDate(th.getUTCFullYear(), 0, 1)) + (7 + 4 - yth.getUTCDay()) % 7 * 864e5),
              // Calendar week: ms between thursdays, div ms per day, div 7 days
              calWeek = (th - yth) / 864e5 / 7 + 1;
            html.push('<td class="cw">' + calWeek + '</td>');
          }
        }
        clsName = this.getClassNames(prevMonth);
        clsName.push('day');

        if (this.o.beforeShowDay !== $.noop) {
          before = this.o.beforeShowDay(this._utc_to_local(prevMonth));
          if (before === undefined)
            before = {};
          else if (typeof before === 'boolean')
            before = {
              enabled: before
            };
          else if (typeof before === 'string')
            before = {
              classes: before
            };
          if (before.enabled === false)
            clsName.push('disabled');
          if (before.classes)
            clsName = clsName.concat(before.classes.split(/\s+/));
          if (before.tooltip)
            tooltip = before.tooltip;
        }

        //Check if uniqueSort exists (supported by jquery >=1.12 and >=2.2)
        //Fallback to unique function for older jquery versions
        if ($.isFunction($.uniqueSort)) {
          clsName = $.uniqueSort(clsName);
        } else {
          clsName = $.unique(clsName);
        }

        // Creative Tim - we added a div inside each td for design purposes
        html.push('<td class="' + clsName.join(' ') + '"' + (tooltip ? ' title="' + tooltip + '"' : '') + (this.o.dateCells ? ' data-date="' + prevMonth.getTime().toString() + '"' : '') + '><div>' + prevMonth.getUTCDate() + '</div></td>');
        tooltip = null;
        if (weekDay === this.o.weekEnd) {
          html.push('</tr>');
        }
        prevMonth.setUTCDate(prevMonth.getUTCDate() + 1);
      }
      this.picker.find('.datepicker-days tbody').html(html.join(''));

      var monthsTitle = dates[this.o.language].monthsTitle || dates['en'].monthsTitle || 'Months';
      var months = this.picker.find('.datepicker-months')
        .find('.datepicker-switch')
        .text(this.o.maxViewMode < 2 ? monthsTitle : year)
        .end()
        .find('tbody span').removeClass('active');

      $.each(this.dates, function(i, d) {
        if (d.getUTCFullYear() === year)
          months.eq(d.getUTCMonth()).addClass('active');
      });

      if (year < startYear || year > endYear) {
        months.addClass('disabled');
      }
      if (year === startYear) {
        months.slice(0, startMonth).addClass('disabled');
      }
      if (year === endYear) {
        months.slice(endMonth + 1).addClass('disabled');
      }

      if (this.o.beforeShowMonth !== $.noop) {
        var that = this;
        $.each(months, function(i, month) {
          var moDate = new Date(year, i, 1);
          var before = that.o.beforeShowMonth(moDate);
          if (before === undefined)
            before = {};
          else if (typeof before === 'boolean')
            before = {
              enabled: before
            };
          else if (typeof before === 'string')
            before = {
              classes: before
            };
          if (before.enabled === false && !$(month).hasClass('disabled'))
            $(month).addClass('disabled');
          if (before.classes)
            $(month).addClass(before.classes);
          if (before.tooltip)
            $(month).prop('title', before.tooltip);
        });
      }

      // Generating decade/years picker
      this._fill_yearsView(
        '.datepicker-years',
        'year',
        10,
        year,
        startYear,
        endYear,
        this.o.beforeShowYear
      );

      // Generating century/decades picker
      this._fill_yearsView(
        '.datepicker-decades',
        'decade',
        100,
        year,
        startYear,
        endYear,
        this.o.beforeShowDecade
      );

      // Generating millennium/centuries picker
      this._fill_yearsView(
        '.datepicker-centuries',
        'century',
        1000,
        year,
        startYear,
        endYear,
        this.o.beforeShowCentury
      );
    },

    updateNavArrows: function() {
      if (!this._allow_update)
        return;

      var d = new Date(this.viewDate),
        year = d.getUTCFullYear(),
        month = d.getUTCMonth(),
        startYear = this.o.startDate !== -Infinity ? this.o.startDate.getUTCFullYear() : -Infinity,
        startMonth = this.o.startDate !== -Infinity ? this.o.startDate.getUTCMonth() : -Infinity,
        endYear = this.o.endDate !== Infinity ? this.o.endDate.getUTCFullYear() : Infinity,
        endMonth = this.o.endDate !== Infinity ? this.o.endDate.getUTCMonth() : Infinity,
        prevIsDisabled,
        nextIsDisabled,
        factor = 1;
      switch (this.viewMode) {
        case 0:
          prevIsDisabled = year <= startYear && month <= startMonth;
          nextIsDisabled = year >= endYear && month >= endMonth;
          break;
        case 4:
          factor *= 10;
          /* falls through */
        case 3:
          factor *= 10;
          /* falls through */
        case 2:
          factor *= 10;
          /* falls through */
        case 1:
          prevIsDisabled = Math.floor(year / factor) * factor <= startYear;
          nextIsDisabled = Math.floor(year / factor) * factor + factor >= endYear;
          break;
      }

      this.picker.find('.prev').toggleClass('disabled', prevIsDisabled);
      this.picker.find('.next').toggleClass('disabled', nextIsDisabled);
    },

    click: function(e) {
      e.preventDefault();
      e.stopPropagation();

      var target, dir, day, year, month;
      target = $(e.target);

      // Clicked on the switch
      if (target.hasClass('datepicker-switch') && this.viewMode !== this.o.maxViewMode) {
        this.setViewMode(this.viewMode + 1);
      }

      // Clicked on today button
      if (target.hasClass('today') && !target.hasClass('day')) {
        this.setViewMode(0);
        this._setDate(UTCToday(), this.o.todayBtn === 'linked' ? null : 'view');
      }

      // Clicked on clear button
      if (target.hasClass('clear')) {
        this.clearDates();
      }

      if (!target.hasClass('disabled')) {
        // Clicked on a day
        if (target.hasClass('day')) {
          day = Number(target.text());
          year = this.viewDate.getUTCFullYear();
          month = this.viewDate.getUTCMonth();

          if (target.hasClass('old') || target.hasClass('new')) {
            dir = target.hasClass('old') ? -1 : 1;
            month = (month + dir + 12) % 12;
            if ((dir === -1 && month === 11) || (dir === 1 && month === 0)) {
              year += dir;
              if (this.o.updateViewDate) {
                this._trigger('changeYear', this.viewDate);
              }
            }
            if (this.o.updateViewDate) {
              this._trigger('changeMonth', this.viewDate);
            }
          }
          this._setDate(UTCDate(year, month, day));
        }

        // Clicked on a month, year, decade, century
        if (target.hasClass('month') ||
          target.hasClass('year') ||
          target.hasClass('decade') ||
          target.hasClass('century')) {
          this.viewDate.setUTCDate(1);

          day = 1;
          if (this.viewMode === 1) {
            month = target.parent().find('span').index(target);
            year = this.viewDate.getUTCFullYear();
            this.viewDate.setUTCMonth(month);
          } else {
            month = 0;
            year = Number(target.text());
            this.viewDate.setUTCFullYear(year);
          }

          this._trigger(DPGlobal.viewModes[this.viewMode - 1].e, this.viewDate);

          if (this.viewMode === this.o.minViewMode) {
            this._setDate(UTCDate(year, month, day));
          } else {
            this.setViewMode(this.viewMode - 1);
            this.fill();
          }
        }
      }

      if (this.picker.is(':visible') && this._focused_from) {
        this._focused_from.focus();
      }
      delete this._focused_from;
    },

    // Clicked on prev or next
    navArrowsClick: function(e) {
      var target = $(e.target);
      var dir = target.hasClass('prev') ? -1 : 1;
      if (this.viewMode !== 0) {
        dir *= DPGlobal.viewModes[this.viewMode].navStep * 12;
      }
      this.viewDate = this.moveMonth(this.viewDate, dir);
      this._trigger(DPGlobal.viewModes[this.viewMode].e, this.viewDate);
      this.fill();
    },

    _toggle_multidate: function(date) {
      var ix = this.dates.contains(date);
      if (!date) {
        this.dates.clear();
      }

      if (ix !== -1) {
        if (this.o.multidate === true || this.o.multidate > 1 || this.o.toggleActive) {
          this.dates.remove(ix);
        }
      } else if (this.o.multidate === false) {
        this.dates.clear();
        this.dates.push(date);
      } else {
        this.dates.push(date);
      }

      if (typeof this.o.multidate === 'number')
        while (this.dates.length > this.o.multidate)
          this.dates.remove(0);
    },

    _setDate: function(date, which) {
      if (!which || which === 'date')
        this._toggle_multidate(date && new Date(date));
      if ((!which && this.o.updateViewDate) || which === 'view')
        this.viewDate = date && new Date(date);

      this.fill();
      this.setValue();
      if (!which || which !== 'view') {
        this._trigger('changeDate');
      }
      this.inputField.trigger('change');
      if (this.o.autoclose && (!which || which === 'date')) {
        this.hide();
      }
    },

    moveDay: function(date, dir) {
      var newDate = new Date(date);
      newDate.setUTCDate(date.getUTCDate() + dir);

      return newDate;
    },

    moveWeek: function(date, dir) {
      return this.moveDay(date, dir * 7);
    },

    moveMonth: function(date, dir) {
      if (!isValidDate(date))
        return this.o.defaultViewDate;
      if (!dir)
        return date;
      var new_date = new Date(date.valueOf()),
        day = new_date.getUTCDate(),
        month = new_date.getUTCMonth(),
        mag = Math.abs(dir),
        new_month, test;
      dir = dir > 0 ? 1 : -1;
      if (mag === 1) {
        test = dir === -1
          // If going back one month, make sure month is not current month
          // (eg, Mar 31 -> Feb 31 == Feb 28, not Mar 02)
          ?
          function() {
            return new_date.getUTCMonth() === month;
          }
          // If going forward one month, make sure month is as expected
          // (eg, Jan 31 -> Feb 31 == Feb 28, not Mar 02)
          :
          function() {
            return new_date.getUTCMonth() !== new_month;
          };
        new_month = month + dir;
        new_date.setUTCMonth(new_month);
        // Dec -> Jan (12) or Jan -> Dec (-1) -- limit expected date to 0-11
        new_month = (new_month + 12) % 12;
      } else {
        // For magnitudes >1, move one month at a time...
        for (var i = 0; i < mag; i++)
          // ...which might decrease the day (eg, Jan 31 to Feb 28, etc)...
          new_date = this.moveMonth(new_date, dir);
        // ...then reset the day, keeping it in the new month
        new_month = new_date.getUTCMonth();
        new_date.setUTCDate(day);
        test = function() {
          return new_month !== new_date.getUTCMonth();
        };
      }
      // Common date-resetting loop -- if date is beyond end of month, make it
      // end of month
      while (test()) {
        new_date.setUTCDate(--day);
        new_date.setUTCMonth(new_month);
      }
      return new_date;
    },

    moveYear: function(date, dir) {
      return this.moveMonth(date, dir * 12);
    },

    moveAvailableDate: function(date, dir, fn) {
      do {
        date = this[fn](date, dir);

        if (!this.dateWithinRange(date))
          return false;

        fn = 'moveDay';
      }
      while (this.dateIsDisabled(date));

      return date;
    },

    weekOfDateIsDisabled: function(date) {
      return $.inArray(date.getUTCDay(), this.o.daysOfWeekDisabled) !== -1;
    },

    dateIsDisabled: function(date) {
      return (
        this.weekOfDateIsDisabled(date) ||
        $.grep(this.o.datesDisabled, function(d) {
          return isUTCEquals(date, d);
        }).length > 0
      );
    },

    dateWithinRange: function(date) {
      return date >= this.o.startDate && date <= this.o.endDate;
    },

    keydown: function(e) {
      if (!this.picker.is(':visible')) {
        if (e.keyCode === 40 || e.keyCode === 27) { // allow down to re-show picker
          this.show();
          e.stopPropagation();
        }
        return;
      }
      var dateChanged = false,
        dir, newViewDate,
        focusDate = this.focusDate || this.viewDate;
      switch (e.keyCode) {
        case 27: // escape
          if (this.focusDate) {
            this.focusDate = null;
            this.viewDate = this.dates.get(-1) || this.viewDate;
            this.fill();
          } else
            this.hide();
          e.preventDefault();
          e.stopPropagation();
          break;
        case 37: // left
        case 38: // up
        case 39: // right
        case 40: // down
          if (!this.o.keyboardNavigation || this.o.daysOfWeekDisabled.length === 7)
            break;
          dir = e.keyCode === 37 || e.keyCode === 38 ? -1 : 1;
          if (this.viewMode === 0) {
            if (e.ctrlKey) {
              newViewDate = this.moveAvailableDate(focusDate, dir, 'moveYear');

              if (newViewDate)
                this._trigger('changeYear', this.viewDate);
            } else if (e.shiftKey) {
              newViewDate = this.moveAvailableDate(focusDate, dir, 'moveMonth');

              if (newViewDate)
                this._trigger('changeMonth', this.viewDate);
            } else if (e.keyCode === 37 || e.keyCode === 39) {
              newViewDate = this.moveAvailableDate(focusDate, dir, 'moveDay');
            } else if (!this.weekOfDateIsDisabled(focusDate)) {
              newViewDate = this.moveAvailableDate(focusDate, dir, 'moveWeek');
            }
          } else if (this.viewMode === 1) {
            if (e.keyCode === 38 || e.keyCode === 40) {
              dir = dir * 4;
            }
            newViewDate = this.moveAvailableDate(focusDate, dir, 'moveMonth');
          } else if (this.viewMode === 2) {
            if (e.keyCode === 38 || e.keyCode === 40) {
              dir = dir * 4;
            }
            newViewDate = this.moveAvailableDate(focusDate, dir, 'moveYear');
          }
          if (newViewDate) {
            this.focusDate = this.viewDate = newViewDate;
            this.setValue();
            this.fill();
            e.preventDefault();
          }
          break;
        case 13: // enter
          if (!this.o.forceParse)
            break;
          focusDate = this.focusDate || this.dates.get(-1) || this.viewDate;
          if (this.o.keyboardNavigation) {
            this._toggle_multidate(focusDate);
            dateChanged = true;
          }
          this.focusDate = null;
          this.viewDate = this.dates.get(-1) || this.viewDate;
          this.setValue();
          this.fill();
          if (this.picker.is(':visible')) {
            e.preventDefault();
            e.stopPropagation();
            if (this.o.autoclose)
              this.hide();
          }
          break;
        case 9: // tab
          this.focusDate = null;
          this.viewDate = this.dates.get(-1) || this.viewDate;
          this.fill();
          this.hide();
          break;
      }
      if (dateChanged) {
        if (this.dates.length)
          this._trigger('changeDate');
        else
          this._trigger('clearDate');
        this.inputField.trigger('change');
      }
    },

    setViewMode: function(viewMode) {
      this.viewMode = viewMode;
      this.picker
        .children('div')
        .hide()
        .filter('.datepicker-' + DPGlobal.viewModes[this.viewMode].clsName)
        .show();
      this.updateNavArrows();
      this._trigger('changeViewMode', new Date(this.viewDate));
    }
  };

  var DateRangePicker = function(element, options) {
    $.data(element, 'datepicker', this);
    this.element = $(element);
    this.inputs = $.map(options.inputs, function(i) {
      return i.jquery ? i[0] : i;
    });
    delete options.inputs;

    this.keepEmptyValues = options.keepEmptyValues;
    delete options.keepEmptyValues;

    datepickerPlugin.call($(this.inputs), options)
      .on('changeDate', $.proxy(this.dateUpdated, this));

    this.pickers = $.map(this.inputs, function(i) {
      return $.data(i, 'datepicker');
    });
    this.updateDates();
  };
  DateRangePicker.prototype = {
    updateDates: function() {
      this.dates = $.map(this.pickers, function(i) {
        return i.getUTCDate();
      });
      this.updateRanges();
    },
    updateRanges: function() {
      var range = $.map(this.dates, function(d) {
        return d.valueOf();
      });
      $.each(this.pickers, function(i, p) {
        p.setRange(range);
      });
    },
    dateUpdated: function(e) {
      // `this.updating` is a workaround for preventing infinite recursion
      // between `changeDate` triggering and `setUTCDate` calling. Until
      // there is a better mechanism.
      if (this.updating)
        return;
      this.updating = true;

      var dp = $.data(e.target, 'datepicker');

      if (dp === undefined) {
        return;
      }

      var new_date = dp.getUTCDate(),
        keep_empty_values = this.keepEmptyValues,
        i = $.inArray(e.target, this.inputs),
        j = i - 1,
        k = i + 1,
        l = this.inputs.length;
      if (i === -1)
        return;

      $.each(this.pickers, function(i, p) {
        if (!p.getUTCDate() && (p === dp || !keep_empty_values))
          p.setUTCDate(new_date);
      });

      if (new_date < this.dates[j]) {
        // Date being moved earlier/left
        while (j >= 0 && new_date < this.dates[j]) {
          this.pickers[j--].setUTCDate(new_date);
        }
      } else if (new_date > this.dates[k]) {
        // Date being moved later/right
        while (k < l && new_date > this.dates[k]) {
          this.pickers[k++].setUTCDate(new_date);
        }
      }
      this.updateDates();

      delete this.updating;
    },
    destroy: function() {
      $.map(this.pickers, function(p) {
        p.destroy();
      });
      $(this.inputs).off('changeDate', this.dateUpdated);
      delete this.element.data().datepicker;
    },
    remove: alias('destroy', 'Method `remove` is deprecated and will be removed in version 2.0. Use `destroy` instead')
  };

  function opts_from_el(el, prefix) {
    // Derive options from element data-attrs
    var data = $(el).data(),
      out = {},
      inkey,
      replace = new RegExp('^' + prefix.toLowerCase() + '([A-Z])');
    prefix = new RegExp('^' + prefix.toLowerCase());

    function re_lower(_, a) {
      return a.toLowerCase();
    }
    for (var key in data)
      if (prefix.test(key)) {
        inkey = key.replace(replace, re_lower);
        out[inkey] = data[key];
      }
    return out;
  }

  function opts_from_locale(lang) {
    // Derive options from locale plugins
    var out = {};
    // Check if "de-DE" style date is available, if not language should
    // fallback to 2 letter code eg "de"
    if (!dates[lang]) {
      lang = lang.split('-')[0];
      if (!dates[lang])
        return;
    }
    var d = dates[lang];
    $.each(locale_opts, function(i, k) {
      if (k in d)
        out[k] = d[k];
    });
    return out;
  }

  var old = $.fn.datepicker;
  var datepickerPlugin = function(option) {
    var args = Array.apply(null, arguments);
    args.shift();
    var internal_return;
    this.each(function() {
      var $this = $(this),
        data = $this.data('datepicker'),
        options = typeof option === 'object' && option;
      if (!data) {
        var elopts = opts_from_el(this, 'date'),
          // Preliminary otions
          xopts = $.extend({}, defaults, elopts, options),
          locopts = opts_from_locale(xopts.language),
          // Options priority: js args, data-attrs, locales, defaults
          opts = $.extend({}, defaults, locopts, elopts, options);
        if ($this.hasClass('input-daterange') || opts.inputs) {
          $.extend(opts, {
            inputs: opts.inputs || $this.find('input').toArray()
          });
          data = new DateRangePicker(this, opts);
        } else {
          data = new Datepicker(this, opts);
        }
        $this.data('datepicker', data);
      }
      if (typeof option === 'string' && typeof data[option] === 'function') {
        internal_return = data[option].apply(data, args);
      }
    });

    if (
      internal_return === undefined ||
      internal_return instanceof Datepicker ||
      internal_return instanceof DateRangePicker
    )
      return this;

    if (this.length > 1)
      throw new Error('Using only allowed for the collection of a single element (' + option + ' function)');
    else
      return internal_return;
  };
  $.fn.datepicker = datepickerPlugin;

  var defaults = $.fn.datepicker.defaults = {
    assumeNearbyYear: false,
    autoclose: false,
    beforeShowDay: $.noop,
    beforeShowMonth: $.noop,
    beforeShowYear: $.noop,
    beforeShowDecade: $.noop,
    beforeShowCentury: $.noop,
    calendarWeeks: false,
    clearBtn: false,
    toggleActive: false,
    daysOfWeekDisabled: [],
    daysOfWeekHighlighted: [],
    datesDisabled: [],
    endDate: Infinity,
    forceParse: true,
    format: 'mm/dd/yyyy',
    keepEmptyValues: false,
    keyboardNavigation: true,
    language: 'en',
    minViewMode: 0,
    maxViewMode: 4,
    multidate: false,
    multidateSeparator: ',',
    orientation: "auto",
    rtl: false,
    startDate: -Infinity,
    startView: 0,
    todayBtn: false,
    todayHighlight: false,
    updateViewDate: true,
    weekStart: 0,
    disableTouchKeyboard: false,
    enableOnReadonly: true,
    showOnFocus: true,
    zIndexOffset: 10,
    container: 'body',
    immediateUpdates: false,
    dateCells: false,
    title: '',
    templates: {
      leftArrow: '&#x00AB;',
      rightArrow: '&#x00BB;'
    }
  };
  var locale_opts = $.fn.datepicker.locale_opts = [
    'format',
    'rtl',
    'weekStart'
  ];
  $.fn.datepicker.Constructor = Datepicker;
  var dates = $.fn.datepicker.dates = {
    en: {
      days: ["Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday"],
      daysShort: ["Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"],
      daysMin: ["Su", "Mo", "Tu", "We", "Th", "Fr", "Sa"],
      months: ["January", "February", "March", "April", "May", "June", "July", "August", "September", "October", "November", "December"],
      monthsShort: ["Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"],
      today: "Today",
      clear: "Clear",
      titleFormat: "MM yyyy"
    }
  };

  var DPGlobal = {
    viewModes: [{
        names: ['days', 'month'],
        clsName: 'days',
        e: 'changeMonth'
      },
      {
        names: ['months', 'year'],
        clsName: 'months',
        e: 'changeYear',
        navStep: 1
      },
      {
        names: ['years', 'decade'],
        clsName: 'years',
        e: 'changeDecade',
        navStep: 10
      },
      {
        names: ['decades', 'century'],
        clsName: 'decades',
        e: 'changeCentury',
        navStep: 100
      },
      {
        names: ['centuries', 'millennium'],
        clsName: 'centuries',
        e: 'changeMillennium',
        navStep: 1000
      }
    ],
    validParts: /dd?|DD?|mm?|MM?|yy(?:yy)?/g,
    nonpunctuation: /[^ -\/:-@\u5e74\u6708\u65e5\[-`{-~\t\n\r]+/g,
    parseFormat: function(format) {
      if (typeof format.toValue === 'function' && typeof format.toDisplay === 'function')
        return format;
      // IE treats \0 as a string end in inputs (truncating the value),
      // so it's a bad format delimiter, anyway
      var separators = format.replace(this.validParts, '\0').split('\0'),
        parts = format.match(this.validParts);
      if (!separators || !separators.length || !parts || parts.length === 0) {
        throw new Error("Invalid date format.");
      }
      return {
        separators: separators,
        parts: parts
      };
    },
    parseDate: function(date, format, language, assumeNearby) {
      if (!date)
        return undefined;
      if (date instanceof Date)
        return date;
      if (typeof format === 'string')
        format = DPGlobal.parseFormat(format);
      if (format.toValue)
        return format.toValue(date, format, language);
      var fn_map = {
          d: 'moveDay',
          m: 'moveMonth',
          w: 'moveWeek',
          y: 'moveYear'
        },
        dateAliases = {
          yesterday: '-1d',
          today: '+0d',
          tomorrow: '+1d'
        },
        parts, part, dir, i, fn;
      if (date in dateAliases) {
        date = dateAliases[date];
      }
      if (/^[\-+]\d+[dmwy]([\s,]+[\-+]\d+[dmwy])*$/i.test(date)) {
        parts = date.match(/([\-+]\d+)([dmwy])/gi);
        date = new Date();
        for (i = 0; i < parts.length; i++) {
          part = parts[i].match(/([\-+]\d+)([dmwy])/i);
          dir = Number(part[1]);
          fn = fn_map[part[2].toLowerCase()];
          date = Datepicker.prototype[fn](date, dir);
        }
        return Datepicker.prototype._zero_utc_time(date);
      }

      parts = date && date.match(this.nonpunctuation) || [];

      function applyNearbyYear(year, threshold) {
        if (threshold === true)
          threshold = 10;

        // if year is 2 digits or less, than the user most likely is trying to get a recent century
        if (year < 100) {
          year += 2000;
          // if the new year is more than threshold years in advance, use last century
          if (year > ((new Date()).getFullYear() + threshold)) {
            year -= 100;
          }
        }

        return year;
      }

      var parsed = {},
        setters_order = ['yyyy', 'yy', 'M', 'MM', 'm', 'mm', 'd', 'dd'],
        setters_map = {
          yyyy: function(d, v) {
            return d.setUTCFullYear(assumeNearby ? applyNearbyYear(v, assumeNearby) : v);
          },
          m: function(d, v) {
            if (isNaN(d))
              return d;
            v -= 1;
            while (v < 0) v += 12;
            v %= 12;
            d.setUTCMonth(v);
            while (d.getUTCMonth() !== v)
              d.setUTCDate(d.getUTCDate() - 1);
            return d;
          },
          d: function(d, v) {
            return d.setUTCDate(v);
          }
        },
        val, filtered;
      setters_map['yy'] = setters_map['yyyy'];
      setters_map['M'] = setters_map['MM'] = setters_map['mm'] = setters_map['m'];
      setters_map['dd'] = setters_map['d'];
      date = UTCToday();
      var fparts = format.parts.slice();
      // Remove noop parts
      if (parts.length !== fparts.length) {
        fparts = $(fparts).filter(function(i, p) {
          return $.inArray(p, setters_order) !== -1;
        }).toArray();
      }
      // Process remainder
      function match_part() {
        var m = this.slice(0, parts[i].length),
          p = parts[i].slice(0, m.length);
        return m.toLowerCase() === p.toLowerCase();
      }
      if (parts.length === fparts.length) {
        var cnt;
        for (i = 0, cnt = fparts.length; i < cnt; i++) {
          val = parseInt(parts[i], 10);
          part = fparts[i];
          if (isNaN(val)) {
            switch (part) {
              case 'MM':
                filtered = $(dates[language].months).filter(match_part);
                val = $.inArray(filtered[0], dates[language].months) + 1;
                break;
              case 'M':
                filtered = $(dates[language].monthsShort).filter(match_part);
                val = $.inArray(filtered[0], dates[language].monthsShort) + 1;
                break;
            }
          }
          parsed[part] = val;
        }
        var _date, s;
        for (i = 0; i < setters_order.length; i++) {
          s = setters_order[i];
          if (s in parsed && !isNaN(parsed[s])) {
            _date = new Date(date);
            setters_map[s](_date, parsed[s]);
            if (!isNaN(_date))
              date = _date;
          }
        }
      }
      return date;
    },
    formatDate: function(date, format, language) {
      if (!date)
        return '';
      if (typeof format === 'string')
        format = DPGlobal.parseFormat(format);
      if (format.toDisplay)
        return format.toDisplay(date, format, language);
      var val = {
        d: date.getUTCDate(),
        D: dates[language].daysShort[date.getUTCDay()],
        DD: dates[language].days[date.getUTCDay()],
        m: date.getUTCMonth() + 1,
        M: dates[language].monthsShort[date.getUTCMonth()],
        MM: dates[language].months[date.getUTCMonth()],
        yy: date.getUTCFullYear().toString().substring(2),
        yyyy: date.getUTCFullYear()
      };
      val.dd = (val.d < 10 ? '0' : '') + val.d;
      val.mm = (val.m < 10 ? '0' : '') + val.m;
      date = [];
      var seps = $.extend([], format.separators);
      for (var i = 0, cnt = format.parts.length; i <= cnt; i++) {
        if (seps.length)
          date.push(seps.shift());
        date.push(val[format.parts[i]]);
      }
      return date.join('');
    },
    headTemplate: '<thead>' +
      '<tr>' +
      '<th colspan="7" class="datepicker-title"></th>' +
      '</tr>' +
      '<tr>' +
      '<th class="prev">&laquo;</th>' +
      '<th colspan="5" class="datepicker-switch"></th>' +
      '<th class="next">&raquo;</th>' +
      '</tr>' +
      '</thead>',
    contTemplate: '<tbody><tr><td colspan="7"></td></tr></tbody>',
    footTemplate: '<tfoot>' +
      '<tr>' +
      '<th colspan="7" class="today"></th>' +
      '</tr>' +
      '<tr>' +
      '<th colspan="7" class="clear"></th>' +
      '</tr>' +
      '</tfoot>'
  };
  DPGlobal.template = '<div class="datepicker">' +
    '<div class="datepicker-days">' +
    '<table class="table-condensed">' +
    DPGlobal.headTemplate +
    '<tbody></tbody>' +
    DPGlobal.footTemplate +
    '</table>' +
    '</div>' +
    '<div class="datepicker-months">' +
    '<table class="table-condensed">' +
    DPGlobal.headTemplate +
    DPGlobal.contTemplate +
    DPGlobal.footTemplate +
    '</table>' +
    '</div>' +
    '<div class="datepicker-years">' +
    '<table class="table-condensed">' +
    DPGlobal.headTemplate +
    DPGlobal.contTemplate +
    DPGlobal.footTemplate +
    '</table>' +
    '</div>' +
    '<div class="datepicker-decades">' +
    '<table class="table-condensed">' +
    DPGlobal.headTemplate +
    DPGlobal.contTemplate +
    DPGlobal.footTemplate +
    '</table>' +
    '</div>' +
    '<div class="datepicker-centuries">' +
    '<table class="table-condensed">' +
    DPGlobal.headTemplate +
    DPGlobal.contTemplate +
    DPGlobal.footTemplate +
    '</table>' +
    '</div>' +
    '</div>';

  $.fn.datepicker.DPGlobal = DPGlobal;


  /* DATEPICKER NO CONFLICT
   * =================== */

  $.fn.datepicker.noConflict = function() {
    $.fn.datepicker = old;
    return this;
  };

  /* DATEPICKER VERSION
   * =================== */
  $.fn.datepicker.version = '1.7.0-dev';

  $.fn.datepicker.deprecated = function(msg) {
    var console = window.console;
    if (console && console.warn) {
      console.warn('DEPRECATED: ' + msg);
    }
  };


  /* DATEPICKER DATA-API
   * ================== */

  $(document).on(
    'focus.datepicker.data-api click.datepicker.data-api',
    '[data-provide="datepicker"]',
    function(e) {
      var $this = $(this);
      if ($this.data('datepicker'))
        return;
      e.preventDefault();
      // component click requires us to explicitly show it
      datepickerPlugin.call($this, 'show');
    }
  );
  $(function() {
    datepickerPlugin.call($('[data-provide="datepicker-inline"]'));
  });

}));