/**

*/ // Following the UMD template github.com/umdjs/umd/blob/master/templates/returnExportsGlobal.js (function (root, factory) {

if (typeof define === 'function' && define.amd) {
    // AMD. Make globaly available as well
    define(['moment', 'jquery'], function (moment, jquery) {
        if (!jquery.fn) jquery.fn = {}; // webpack server rendering
        return factory(moment, jquery);
    });
} else if (typeof module === 'object' && module.exports) {
    // Node / Browserify
    //isomorphic issue
    var jQuery = (typeof window != 'undefined') ? window.jQuery : undefined;
    if (!jQuery) {
        jQuery = require('jquery');
        if (!jQuery.fn) jQuery.fn = {};
    }
    var moment = (typeof window != 'undefined' && typeof window.moment != 'undefined') ? window.moment : require('moment');
    module.exports = factory(moment, jQuery);
} else {
    // Browser globals
    root.daterangepicker = factory(root.moment, root.jQuery);
}

}(this, function(moment, $) {

var DateRangePicker = function(element, options, cb) {

    //default settings for options
    this.parentEl = 'body';
    this.element = $(element);
    this.startDate = moment().startOf('day');
    this.endDate = moment().endOf('day');
    this.minDate = false;
    this.maxDate = false;
    this.maxSpan = false;
    this.autoApply = false;
    this.singleDatePicker = false;
    this.showDropdowns = false;
    this.minYear = moment().subtract(100, 'year').format('YYYY');
    this.maxYear = moment().add(100, 'year').format('YYYY');
    this.showWeekNumbers = false;
    this.showISOWeekNumbers = false;
    this.showCustomRangeLabel = true;
    this.timePicker = false;
    this.timePicker24Hour = false;
    this.timePickerIncrement = 1;
    this.timePickerSeconds = false;
    this.linkedCalendars = true;
    this.autoUpdateInput = true;
    this.alwaysShowCalendars = false;
    this.ranges = {};

    this.opens = 'right';
    if (this.element.hasClass('pull-right'))
        this.opens = 'left';

    this.drops = 'down';
    if (this.element.hasClass('dropup'))
        this.drops = 'up';

    this.buttonClasses = 'btn btn-sm';
    this.applyButtonClasses = 'btn-primary';
    this.cancelButtonClasses = 'btn-default';

    this.locale = {
        direction: 'ltr',
        format: moment.localeData().longDateFormat('L'),
        separator: ' - ',
        applyLabel: 'Apply',
        cancelLabel: 'Cancel',
        weekLabel: 'W',
        customRangeLabel: 'Custom Range',
        daysOfWeek: moment.weekdaysMin(),
        monthNames: moment.monthsShort(),
        firstDay: moment.localeData().firstDayOfWeek()
    };

    this.callback = function() { };

    //some state information
    this.isShowing = false;
    this.leftCalendar = {};
    this.rightCalendar = {};

    //custom options from user
    if (typeof options !== 'object' || options === null)
        options = {};

    //allow setting options with data attributes
    //data-api options will be overwritten with custom javascript options
    options = $.extend(this.element.data(), options);

    //html template for the picker UI
    if (typeof options.template !== 'string' && !(options.template instanceof $))
        options.template =
        '<div class="daterangepicker">' +
            '<div class="ranges"></div>' +
            '<div class="drp-calendar left">' +
                '<div class="calendar-table"></div>' +
                '<div class="calendar-time"></div>' +
            '</div>' +
            '<div class="drp-calendar right">' +
                '<div class="calendar-table"></div>' +
                '<div class="calendar-time"></div>' +
            '</div>' +
            '<div class="drp-buttons">' +
                '<span class="drp-selected"></span>' +
                '<button class="cancelBtn" type="button"></button>' +
                '<button class="applyBtn" disabled="disabled" type="button"></button> ' +
            '</div>' +
        '</div>';

    this.parentEl = (options.parentEl && $(options.parentEl).length) ? $(options.parentEl) : $(this.parentEl);
    this.container = $(options.template).appendTo(this.parentEl);

    //
    // handle all the possible options overriding defaults
    //

    if (typeof options.locale === 'object') {

        if (typeof options.locale.direction === 'string')
            this.locale.direction = options.locale.direction;

        if (typeof options.locale.format === 'string')
            this.locale.format = options.locale.format;

        if (typeof options.locale.separator === 'string')
            this.locale.separator = options.locale.separator;

        if (typeof options.locale.daysOfWeek === 'object')
            this.locale.daysOfWeek = options.locale.daysOfWeek.slice();

        if (typeof options.locale.monthNames === 'object')
          this.locale.monthNames = options.locale.monthNames.slice();

        if (typeof options.locale.firstDay === 'number')
          this.locale.firstDay = options.locale.firstDay;

        if (typeof options.locale.applyLabel === 'string')
          this.locale.applyLabel = options.locale.applyLabel;

        if (typeof options.locale.cancelLabel === 'string')
          this.locale.cancelLabel = options.locale.cancelLabel;

        if (typeof options.locale.weekLabel === 'string')
          this.locale.weekLabel = options.locale.weekLabel;

        if (typeof options.locale.customRangeLabel === 'string'){
            //Support unicode chars in the custom range name.
            var elem = document.createElement('textarea');
            elem.innerHTML = options.locale.customRangeLabel;
            var rangeHtml = elem.value;
            this.locale.customRangeLabel = rangeHtml;
        }
    }
    this.container.addClass(this.locale.direction);

    if (typeof options.startDate === 'string')
        this.startDate = moment(options.startDate, this.locale.format);

    if (typeof options.endDate === 'string')
        this.endDate = moment(options.endDate, this.locale.format);

    if (typeof options.minDate === 'string')
        this.minDate = moment(options.minDate, this.locale.format);

    if (typeof options.maxDate === 'string')
        this.maxDate = moment(options.maxDate, this.locale.format);

    if (typeof options.startDate === 'object')
        this.startDate = moment(options.startDate);

    if (typeof options.endDate === 'object')
        this.endDate = moment(options.endDate);

    if (typeof options.minDate === 'object')
        this.minDate = moment(options.minDate);

    if (typeof options.maxDate === 'object')
        this.maxDate = moment(options.maxDate);

    // sanity check for bad options
    if (this.minDate && this.startDate.isBefore(this.minDate))
        this.startDate = this.minDate.clone();

    // sanity check for bad options
    if (this.maxDate && this.endDate.isAfter(this.maxDate))
        this.endDate = this.maxDate.clone();

    if (typeof options.applyButtonClasses === 'string')
        this.applyButtonClasses = options.applyButtonClasses;

    if (typeof options.applyClass === 'string') //backwards compat
        this.applyButtonClasses = options.applyClass;

    if (typeof options.cancelButtonClasses === 'string')
        this.cancelButtonClasses = options.cancelButtonClasses;

    if (typeof options.cancelClass === 'string') //backwards compat
        this.cancelButtonClasses = options.cancelClass;

    if (typeof options.maxSpan === 'object')
        this.maxSpan = options.maxSpan;

    if (typeof options.dateLimit === 'object') //backwards compat
        this.maxSpan = options.dateLimit;

    if (typeof options.opens === 'string')
        this.opens = options.opens;

    if (typeof options.drops === 'string')
        this.drops = options.drops;

    if (typeof options.showWeekNumbers === 'boolean')
        this.showWeekNumbers = options.showWeekNumbers;

    if (typeof options.showISOWeekNumbers === 'boolean')
        this.showISOWeekNumbers = options.showISOWeekNumbers;

    if (typeof options.buttonClasses === 'string')
        this.buttonClasses = options.buttonClasses;

    if (typeof options.buttonClasses === 'object')
        this.buttonClasses = options.buttonClasses.join(' ');

    if (typeof options.showDropdowns === 'boolean')
        this.showDropdowns = options.showDropdowns;

    if (typeof options.minYear === 'number')
        this.minYear = options.minYear;

    if (typeof options.maxYear === 'number')
        this.maxYear = options.maxYear;

    if (typeof options.showCustomRangeLabel === 'boolean')
        this.showCustomRangeLabel = options.showCustomRangeLabel;

    if (typeof options.singleDatePicker === 'boolean') {
        this.singleDatePicker = options.singleDatePicker;
        if (this.singleDatePicker)
            this.endDate = this.startDate.clone();
    }

    if (typeof options.timePicker === 'boolean')
        this.timePicker = options.timePicker;

    if (typeof options.timePickerSeconds === 'boolean')
        this.timePickerSeconds = options.timePickerSeconds;

    if (typeof options.timePickerIncrement === 'number')
        this.timePickerIncrement = options.timePickerIncrement;

    if (typeof options.timePicker24Hour === 'boolean')
        this.timePicker24Hour = options.timePicker24Hour;

    if (typeof options.autoApply === 'boolean')
        this.autoApply = options.autoApply;

    if (typeof options.autoUpdateInput === 'boolean')
        this.autoUpdateInput = options.autoUpdateInput;

    if (typeof options.linkedCalendars === 'boolean')
        this.linkedCalendars = options.linkedCalendars;

    if (typeof options.isInvalidDate === 'function')
        this.isInvalidDate = options.isInvalidDate;

    if (typeof options.isCustomDate === 'function')
        this.isCustomDate = options.isCustomDate;

    if (typeof options.alwaysShowCalendars === 'boolean')
        this.alwaysShowCalendars = options.alwaysShowCalendars;

    // update day names order to firstDay
    if (this.locale.firstDay != 0) {
        var iterator = this.locale.firstDay;
        while (iterator > 0) {
            this.locale.daysOfWeek.push(this.locale.daysOfWeek.shift());
            iterator--;
        }
    }

    var start, end, range;

    //if no start/end dates set, check if an input element contains initial values
    if (typeof options.startDate === 'undefined' && typeof options.endDate === 'undefined') {
        if ($(this.element).is(':text')) {
            var val = $(this.element).val(),
                split = val.split(this.locale.separator);

            start = end = null;

            if (split.length == 2) {
                start = moment(split[0], this.locale.format);
                end = moment(split[1], this.locale.format);
            } else if (this.singleDatePicker && val !== "") {
                start = moment(val, this.locale.format);
                end = moment(val, this.locale.format);
            }
            if (start !== null && end !== null) {
                this.setStartDate(start);
                this.setEndDate(end);
            }
        }
    }

    if (typeof options.ranges === 'object') {
        for (range in options.ranges) {

            if (typeof options.ranges[range][0] === 'string')
                start = moment(options.ranges[range][0], this.locale.format);
            else
                start = moment(options.ranges[range][0]);

            if (typeof options.ranges[range][1] === 'string')
                end = moment(options.ranges[range][1], this.locale.format);
            else
                end = moment(options.ranges[range][1]);

            // If the start or end date exceed those allowed by the minDate or maxSpan
            // options, shorten the range to the allowable period.
            if (this.minDate && start.isBefore(this.minDate))
                start = this.minDate.clone();

            var maxDate = this.maxDate;
            if (this.maxSpan && maxDate && start.clone().add(this.maxSpan).isAfter(maxDate))
                maxDate = start.clone().add(this.maxSpan);
            if (maxDate && end.isAfter(maxDate))
                end = maxDate.clone();

            // If the end of the range is before the minimum or the start of the range is
            // after the maximum, don't display this range option at all.
            if ((this.minDate && end.isBefore(this.minDate, this.timepicker ? 'minute' : 'day'))
              || (maxDate && start.isAfter(maxDate, this.timepicker ? 'minute' : 'day')))
                continue;

            //Support unicode chars in the range names.
            var elem = document.createElement('textarea');
            elem.innerHTML = range;
            var rangeHtml = elem.value;

            this.ranges[rangeHtml] = [start, end];
        }

        var list = '<ul>';
        for (range in this.ranges) {
            list += '<li data-range-key="' + range + '">' + range + '</li>';
        }
        if (this.showCustomRangeLabel) {
            list += '<li data-range-key="' + this.locale.customRangeLabel + '">' + this.locale.customRangeLabel + '</li>';
        }
        list += '</ul>';
        this.container.find('.ranges').prepend(list);
    }

    if (typeof cb === 'function') {
        this.callback = cb;
    }

    if (!this.timePicker) {
        this.startDate = this.startDate.startOf('day');
        this.endDate = this.endDate.endOf('day');
        this.container.find('.calendar-time').hide();
    }

    //can't be used together for now
    if (this.timePicker && this.autoApply)
        this.autoApply = false;

    if (this.autoApply) {
        this.container.addClass('auto-apply');
    }

    if (typeof options.ranges === 'object')
        this.container.addClass('show-ranges');

    if (this.singleDatePicker) {
        this.container.addClass('single');
        this.container.find('.drp-calendar.left').addClass('single');
        this.container.find('.drp-calendar.left').show();
        this.container.find('.drp-calendar.right').hide();
        if (!this.timePicker) {
            this.container.addClass('auto-apply');
        }
    }

    if ((typeof options.ranges === 'undefined' && !this.singleDatePicker) || this.alwaysShowCalendars) {
        this.container.addClass('show-calendar');
    }

    this.container.addClass('opens' + this.opens);

    //apply CSS classes and labels to buttons
    this.container.find('.applyBtn, .cancelBtn').addClass(this.buttonClasses);
    if (this.applyButtonClasses.length)
        this.container.find('.applyBtn').addClass(this.applyButtonClasses);
    if (this.cancelButtonClasses.length)
        this.container.find('.cancelBtn').addClass(this.cancelButtonClasses);
    this.container.find('.applyBtn').html(this.locale.applyLabel);
    this.container.find('.cancelBtn').html(this.locale.cancelLabel);

    //
    // event listeners
    //

    this.container.find('.drp-calendar')
        .on('click.daterangepicker', '.prev', $.proxy(this.clickPrev, this))
        .on('click.daterangepicker', '.next', $.proxy(this.clickNext, this))
        .on('mousedown.daterangepicker', 'td.available', $.proxy(this.clickDate, this))
        .on('mouseenter.daterangepicker', 'td.available', $.proxy(this.hoverDate, this))
        .on('change.daterangepicker', 'select.yearselect', $.proxy(this.monthOrYearChanged, this))
        .on('change.daterangepicker', 'select.monthselect', $.proxy(this.monthOrYearChanged, this))
        .on('change.daterangepicker', 'select.hourselect,select.minuteselect,select.secondselect,select.ampmselect', $.proxy(this.timeChanged, this))

    this.container.find('.ranges')
        .on('click.daterangepicker', 'li', $.proxy(this.clickRange, this))

    this.container.find('.drp-buttons')
        .on('click.daterangepicker', 'button.applyBtn', $.proxy(this.clickApply, this))
        .on('click.daterangepicker', 'button.cancelBtn', $.proxy(this.clickCancel, this))

    if (this.element.is('input') || this.element.is('button')) {
        this.element.on({
            'click.daterangepicker': $.proxy(this.show, this),
            'focus.daterangepicker': $.proxy(this.show, this),
            'keyup.daterangepicker': $.proxy(this.elementChanged, this),
            'keydown.daterangepicker': $.proxy(this.keydown, this) //IE 11 compatibility
        });
    } else {
        this.element.on('click.daterangepicker', $.proxy(this.toggle, this));
        this.element.on('keydown.daterangepicker', $.proxy(this.toggle, this));
    }

    //
    // if attached to a text input, set the initial value
    //

    this.updateElement();

};

DateRangePicker.prototype = {

    constructor: DateRangePicker,

    setStartDate: function(startDate) {
        if (typeof startDate === 'string')
            this.startDate = moment(startDate, this.locale.format);

        if (typeof startDate === 'object')
            this.startDate = moment(startDate);

        if (!this.timePicker)
            this.startDate = this.startDate.startOf('day');

        if (this.timePicker && this.timePickerIncrement)
            this.startDate.minute(Math.round(this.startDate.minute() / this.timePickerIncrement) * this.timePickerIncrement);

        if (this.minDate && this.startDate.isBefore(this.minDate)) {
            this.startDate = this.minDate.clone();
            if (this.timePicker && this.timePickerIncrement)
                this.startDate.minute(Math.round(this.startDate.minute() / this.timePickerIncrement) * this.timePickerIncrement);
        }

        if (this.maxDate && this.startDate.isAfter(this.maxDate)) {
            this.startDate = this.maxDate.clone();
            if (this.timePicker && this.timePickerIncrement)
                this.startDate.minute(Math.floor(this.startDate.minute() / this.timePickerIncrement) * this.timePickerIncrement);
        }

        if (!this.isShowing)
            this.updateElement();

        this.updateMonthsInView();
    },

    setEndDate: function(endDate) {
        if (typeof endDate === 'string')
            this.endDate = moment(endDate, this.locale.format);

        if (typeof endDate === 'object')
            this.endDate = moment(endDate);

        if (!this.timePicker)
            this.endDate = this.endDate.add(1,'d').startOf('day').subtract(1,'second');

        if (this.timePicker && this.timePickerIncrement)
            this.endDate.minute(Math.round(this.endDate.minute() / this.timePickerIncrement) * this.timePickerIncrement);

        if (this.endDate.isBefore(this.startDate))
            this.endDate = this.startDate.clone();

        if (this.maxDate && this.endDate.isAfter(this.maxDate))
            this.endDate = this.maxDate.clone();

        if (this.maxSpan && this.startDate.clone().add(this.maxSpan).isBefore(this.endDate))
            this.endDate = this.startDate.clone().add(this.maxSpan);

        this.previousRightTime = this.endDate.clone();

        this.container.find('.drp-selected').html(this.startDate.format(this.locale.format) + this.locale.separator + this.endDate.format(this.locale.format));

        if (!this.isShowing)
            this.updateElement();

        this.updateMonthsInView();
    },

    isInvalidDate: function() {
        return false;
    },

    isCustomDate: function() {
        return false;
    },

    updateView: function() {
        if (this.timePicker) {
            this.renderTimePicker('left');
            this.renderTimePicker('right');
            if (!this.endDate) {
                this.container.find('.right .calendar-time select').attr('disabled', 'disabled').addClass('disabled');
            } else {
                this.container.find('.right .calendar-time select').removeAttr('disabled').removeClass('disabled');
            }
        }
        if (this.endDate)
            this.container.find('.drp-selected').html(this.startDate.format(this.locale.format) + this.locale.separator + this.endDate.format(this.locale.format));
        this.updateMonthsInView();
        this.updateCalendars();
        this.updateFormInputs();
    },

    updateMonthsInView: function() {
        if (this.endDate) {

            //if both dates are visible already, do nothing
            if (!this.singleDatePicker && this.leftCalendar.month && this.rightCalendar.month &&
                (this.startDate.format('YYYY-MM') == this.leftCalendar.month.format('YYYY-MM') || this.startDate.format('YYYY-MM') == this.rightCalendar.month.format('YYYY-MM'))
                &&
                (this.endDate.format('YYYY-MM') == this.leftCalendar.month.format('YYYY-MM') || this.endDate.format('YYYY-MM') == this.rightCalendar.month.format('YYYY-MM'))
                ) {
                return;
            }

            this.leftCalendar.month = this.startDate.clone().date(2);
            if (!this.linkedCalendars && (this.endDate.month() != this.startDate.month() || this.endDate.year() != this.startDate.year())) {
                this.rightCalendar.month = this.endDate.clone().date(2);
            } else {
                this.rightCalendar.month = this.startDate.clone().date(2).add(1, 'month');
            }

        } else {
            if (this.leftCalendar.month.format('YYYY-MM') != this.startDate.format('YYYY-MM') && this.rightCalendar.month.format('YYYY-MM') != this.startDate.format('YYYY-MM')) {
                this.leftCalendar.month = this.startDate.clone().date(2);
                this.rightCalendar.month = this.startDate.clone().date(2).add(1, 'month');
            }
        }
        if (this.maxDate && this.linkedCalendars && !this.singleDatePicker && this.rightCalendar.month > this.maxDate) {
          this.rightCalendar.month = this.maxDate.clone().date(2);
          this.leftCalendar.month = this.maxDate.clone().date(2).subtract(1, 'month');
        }
    },

    updateCalendars: function() {

        if (this.timePicker) {
            var hour, minute, second;
            if (this.endDate) {
                hour = parseInt(this.container.find('.left .hourselect').val(), 10);
                minute = parseInt(this.container.find('.left .minuteselect').val(), 10);
                second = this.timePickerSeconds ? parseInt(this.container.find('.left .secondselect').val(), 10) : 0;
                if (!this.timePicker24Hour) {
                    var ampm = this.container.find('.left .ampmselect').val();
                    if (ampm === 'PM' && hour < 12)
                        hour += 12;
                    if (ampm === 'AM' && hour === 12)
                        hour = 0;
                }
            } else {
                hour = parseInt(this.container.find('.right .hourselect').val(), 10);
                minute = parseInt(this.container.find('.right .minuteselect').val(), 10);
                second = this.timePickerSeconds ? parseInt(this.container.find('.right .secondselect').val(), 10) : 0;
                if (!this.timePicker24Hour) {
                    var ampm = this.container.find('.right .ampmselect').val();
                    if (ampm === 'PM' && hour < 12)
                        hour += 12;
                    if (ampm === 'AM' && hour === 12)
                        hour = 0;
                }
            }
            this.leftCalendar.month.hour(hour).minute(minute).second(second);
            this.rightCalendar.month.hour(hour).minute(minute).second(second);
        }

        this.renderCalendar('left');
        this.renderCalendar('right');

        //highlight any predefined range matching the current start and end dates
        this.container.find('.ranges li').removeClass('active');
        if (this.endDate == null) return;

        this.calculateChosenLabel();
    },

    renderCalendar: function(side) {

        //
        // Build the matrix of dates that will populate the calendar
        //

        var calendar = side == 'left' ? this.leftCalendar : this.rightCalendar;
        var month = calendar.month.month();
        var year = calendar.month.year();
        var hour = calendar.month.hour();
        var minute = calendar.month.minute();
        var second = calendar.month.second();
        var daysInMonth = moment([year, month]).daysInMonth();
        var firstDay = moment([year, month, 1]);
        var lastDay = moment([year, month, daysInMonth]);
        var lastMonth = moment(firstDay).subtract(1, 'month').month();
        var lastYear = moment(firstDay).subtract(1, 'month').year();
        var daysInLastMonth = moment([lastYear, lastMonth]).daysInMonth();
        var dayOfWeek = firstDay.day();

        //initialize a 6 rows x 7 columns array for the calendar
        var calendar = [];
        calendar.firstDay = firstDay;
        calendar.lastDay = lastDay;

        for (var i = 0; i < 6; i++) {
            calendar[i] = [];
        }

        //populate the calendar with date objects
        var startDay = daysInLastMonth - dayOfWeek + this.locale.firstDay + 1;
        if (startDay > daysInLastMonth)
            startDay -= 7;

        if (dayOfWeek == this.locale.firstDay)
            startDay = daysInLastMonth - 6;

        var curDate = moment([lastYear, lastMonth, startDay, 12, minute, second]);

        var col, row;
        for (var i = 0, col = 0, row = 0; i < 42; i++, col++, curDate = moment(curDate).add(24, 'hour')) {
            if (i > 0 && col % 7 === 0) {
                col = 0;
                row++;
            }
            calendar[row][col] = curDate.clone().hour(hour).minute(minute).second(second);
            curDate.hour(12);

            if (this.minDate && calendar[row][col].format('YYYY-MM-DD') == this.minDate.format('YYYY-MM-DD') && calendar[row][col].isBefore(this.minDate) && side == 'left') {
                calendar[row][col] = this.minDate.clone();
            }

            if (this.maxDate && calendar[row][col].format('YYYY-MM-DD') == this.maxDate.format('YYYY-MM-DD') && calendar[row][col].isAfter(this.maxDate) && side == 'right') {
                calendar[row][col] = this.maxDate.clone();
            }

        }

        //make the calendar object available to hoverDate/clickDate
        if (side == 'left') {
            this.leftCalendar.calendar = calendar;
        } else {
            this.rightCalendar.calendar = calendar;
        }

        //
        // Display the calendar
        //

        var minDate = side == 'left' ? this.minDate : this.startDate;
        var maxDate = this.maxDate;
        var selected = side == 'left' ? this.startDate : this.endDate;
        var arrow = this.locale.direction == 'ltr' ? {left: 'chevron-left', right: 'chevron-right'} : {left: 'chevron-right', right: 'chevron-left'};

        var html = '<table class="table-condensed">';
        html += '<thead>';
        html += '<tr>';

        // add empty cell for week number
        if (this.showWeekNumbers || this.showISOWeekNumbers)
            html += '<th></th>';

        if ((!minDate || minDate.isBefore(calendar.firstDay)) && (!this.linkedCalendars || side == 'left')) {
            html += '<th class="prev available"><span></span></th>';
        } else {
            html += '<th></th>';
        }

        var dateHtml = this.locale.monthNames[calendar[1][1].month()] + calendar[1][1].format(" YYYY");

        if (this.showDropdowns) {
            var currentMonth = calendar[1][1].month();
            var currentYear = calendar[1][1].year();
            var maxYear = (maxDate && maxDate.year()) || (this.maxYear);
            var minYear = (minDate && minDate.year()) || (this.minYear);
            var inMinYear = currentYear == minYear;
            var inMaxYear = currentYear == maxYear;

            var monthHtml = '<select class="monthselect">';
            for (var m = 0; m < 12; m++) {
                if ((!inMinYear || m >= minDate.month()) && (!inMaxYear || m <= maxDate.month())) {
                    monthHtml += "<option value='" + m + "'" +
                        (m === currentMonth ? " selected='selected'" : "") +
                        ">" + this.locale.monthNames[m] + "</option>";
                } else {
                    monthHtml += "<option value='" + m + "'" +
                        (m === currentMonth ? " selected='selected'" : "") +
                        " disabled='disabled'>" + this.locale.monthNames[m] + "</option>";
                }
            }
            monthHtml += "</select>";

            var yearHtml = '<select class="yearselect">';
            for (var y = minYear; y <= maxYear; y++) {
                yearHtml += '<option value="' + y + '"' +
                    (y === currentYear ? ' selected="selected"' : '') +
                    '>' + y + '</option>';
            }
            yearHtml += '</select>';

            dateHtml = monthHtml + yearHtml;
        }

        html += '<th colspan="5" class="month">' + dateHtml + '</th>';
        if ((!maxDate || maxDate.isAfter(calendar.lastDay)) && (!this.linkedCalendars || side == 'right' || this.singleDatePicker)) {
            html += '<th class="next available"><span></span></th>';
        } else {
            html += '<th></th>';
        }

        html += '</tr>';
        html += '<tr>';

        // add week number label
        if (this.showWeekNumbers || this.showISOWeekNumbers)
            html += '<th class="week">' + this.locale.weekLabel + '</th>';

        $.each(this.locale.daysOfWeek, function(index, dayOfWeek) {
            html += '<th>' + dayOfWeek + '</th>';
        });

        html += '</tr>';
        html += '</thead>';
        html += '<tbody>';

        //adjust maxDate to reflect the maxSpan setting in order to
        //grey out end dates beyond the maxSpan
        if (this.endDate == null && this.maxSpan) {
            var maxLimit = this.startDate.clone().add(this.maxSpan).endOf('day');
            if (!maxDate || maxLimit.isBefore(maxDate)) {
                maxDate = maxLimit;
            }
        }

        for (var row = 0; row < 6; row++) {
            html += '<tr>';

            // add week number
            if (this.showWeekNumbers)
                html += '<td class="week">' + calendar[row][0].week() + '</td>';
            else if (this.showISOWeekNumbers)
                html += '<td class="week">' + calendar[row][0].isoWeek() + '</td>';

            for (var col = 0; col < 7; col++) {

                var classes = [];

                //highlight today's date
                if (calendar[row][col].isSame(new Date(), "day"))
                    classes.push('today');

                //highlight weekends
                if (calendar[row][col].isoWeekday() > 5)
                    classes.push('weekend');

                //grey out the dates in other months displayed at beginning and end of this calendar
                if (calendar[row][col].month() != calendar[1][1].month())
                    classes.push('off');

                //don't allow selection of dates before the minimum date
                if (this.minDate && calendar[row][col].isBefore(this.minDate, 'day'))
                    classes.push('off', 'disabled');

                //don't allow selection of dates after the maximum date
                if (maxDate && calendar[row][col].isAfter(maxDate, 'day'))
                    classes.push('off', 'disabled');

                //don't allow selection of date if a custom function decides it's invalid
                if (this.isInvalidDate(calendar[row][col]))
                    classes.push('off', 'disabled');

                //highlight the currently selected start date
                if (calendar[row][col].format('YYYY-MM-DD') == this.startDate.format('YYYY-MM-DD'))
                    classes.push('active', 'start-date');

                //highlight the currently selected end date
                if (this.endDate != null && calendar[row][col].format('YYYY-MM-DD') == this.endDate.format('YYYY-MM-DD'))
                    classes.push('active', 'end-date');

                //highlight dates in-between the selected dates
                if (this.endDate != null && calendar[row][col] > this.startDate && calendar[row][col] < this.endDate)
                    classes.push('in-range');

                //apply custom classes for this date
                var isCustom = this.isCustomDate(calendar[row][col]);
                if (isCustom !== false) {
                    if (typeof isCustom === 'string')
                        classes.push(isCustom);
                    else
                        Array.prototype.push.apply(classes, isCustom);
                }

                var cname = '', disabled = false;
                for (var i = 0; i < classes.length; i++) {
                    cname += classes[i] + ' ';
                    if (classes[i] == 'disabled')
                        disabled = true;
                }
                if (!disabled)
                    cname += 'available';

                html += '<td class="' + cname.replace(/^\s+|\s+$/g, '') + '" data-title="' + 'r' + row + 'c' + col + '">' + calendar[row][col].date() + '</td>';

            }
            html += '</tr>';
        }

        html += '</tbody>';
        html += '</table>';

        this.container.find('.drp-calendar.' + side + ' .calendar-table').html(html);

    },

    renderTimePicker: function(side) {

        // Don't bother updating the time picker if it's currently disabled
        // because an end date hasn't been clicked yet
        if (side == 'right' && !this.endDate) return;

        var html, selected, minDate, maxDate = this.maxDate;

        if (this.maxSpan && (!this.maxDate || this.startDate.clone().add(this.maxSpan).isAfter(this.maxDate)))
            maxDate = this.startDate.clone().add(this.maxSpan);

        if (side == 'left') {
            selected = this.startDate.clone();
            minDate = this.minDate;
        } else if (side == 'right') {
            selected = this.endDate.clone();
            minDate = this.startDate;

            //Preserve the time already selected
            var timeSelector = this.container.find('.drp-calendar.right .calendar-time');
            if (timeSelector.html() != '') {

                selected.hour(selected.hour() || timeSelector.find('.hourselect option:selected').val());
                selected.minute(selected.minute() || timeSelector.find('.minuteselect option:selected').val());
                selected.second(selected.second() || timeSelector.find('.secondselect option:selected').val());

                if (!this.timePicker24Hour) {
                    var ampm = timeSelector.find('.ampmselect option:selected').val();
                    if (ampm === 'PM' && selected.hour() < 12)
                        selected.hour(selected.hour() + 12);
                    if (ampm === 'AM' && selected.hour() === 12)
                        selected.hour(0);
                }

            }

            if (selected.isBefore(this.startDate))
                selected = this.startDate.clone();

            if (maxDate && selected.isAfter(maxDate))
                selected = maxDate.clone();

        }

        //
        // hours
        //

        html = '<select class="hourselect">';

        var start = this.timePicker24Hour ? 0 : 1;
        var end = this.timePicker24Hour ? 23 : 12;

        for (var i = start; i <= end; i++) {
            var i_in_24 = i;
            if (!this.timePicker24Hour)
                i_in_24 = selected.hour() >= 12 ? (i == 12 ? 12 : i + 12) : (i == 12 ? 0 : i);

            var time = selected.clone().hour(i_in_24);
            var disabled = false;
            if (minDate && time.minute(59).isBefore(minDate))
                disabled = true;
            if (maxDate && time.minute(0).isAfter(maxDate))
                disabled = true;

            if (i_in_24 == selected.hour() && !disabled) {
                html += '<option value="' + i + '" selected="selected">' + i + '</option>';
            } else if (disabled) {
                html += '<option value="' + i + '" disabled="disabled" class="disabled">' + i + '</option>';
            } else {
                html += '<option value="' + i + '">' + i + '</option>';
            }
        }

        html += '</select> ';

        //
        // minutes
        //

        html += ': <select class="minuteselect">';

        for (var i = 0; i < 60; i += this.timePickerIncrement) {
            var padded = i < 10 ? '0' + i : i;
            var time = selected.clone().minute(i);

            var disabled = false;
            if (minDate && time.second(59).isBefore(minDate))
                disabled = true;
            if (maxDate && time.second(0).isAfter(maxDate))
                disabled = true;

            if (selected.minute() == i && !disabled) {
                html += '<option value="' + i + '" selected="selected">' + padded + '</option>';
            } else if (disabled) {
                html += '<option value="' + i + '" disabled="disabled" class="disabled">' + padded + '</option>';
            } else {
                html += '<option value="' + i + '">' + padded + '</option>';
            }
        }

        html += '</select> ';

        //
        // seconds
        //

        if (this.timePickerSeconds) {
            html += ': <select class="secondselect">';

            for (var i = 0; i < 60; i++) {
                var padded = i < 10 ? '0' + i : i;
                var time = selected.clone().second(i);

                var disabled = false;
                if (minDate && time.isBefore(minDate))
                    disabled = true;
                if (maxDate && time.isAfter(maxDate))
                    disabled = true;

                if (selected.second() == i && !disabled) {
                    html += '<option value="' + i + '" selected="selected">' + padded + '</option>';
                } else if (disabled) {
                    html += '<option value="' + i + '" disabled="disabled" class="disabled">' + padded + '</option>';
                } else {
                    html += '<option value="' + i + '">' + padded + '</option>';
                }
            }

            html += '</select> ';
        }

        //
        // AM/PM
        //

        if (!this.timePicker24Hour) {
            html += '<select class="ampmselect">';

            var am_html = '';
            var pm_html = '';

            if (minDate && selected.clone().hour(12).minute(0).second(0).isBefore(minDate))
                am_html = ' disabled="disabled" class="disabled"';

            if (maxDate && selected.clone().hour(0).minute(0).second(0).isAfter(maxDate))
                pm_html = ' disabled="disabled" class="disabled"';

            if (selected.hour() >= 12) {
                html += '<option value="AM"' + am_html + '>AM</option><option value="PM" selected="selected"' + pm_html + '>PM</option>';
            } else {
                html += '<option value="AM" selected="selected"' + am_html + '>AM</option><option value="PM"' + pm_html + '>PM</option>';
            }

            html += '</select>';
        }

        this.container.find('.drp-calendar.' + side + ' .calendar-time').html(html);

    },

    updateFormInputs: function() {

        if (this.singleDatePicker || (this.endDate && (this.startDate.isBefore(this.endDate) || this.startDate.isSame(this.endDate)))) {
            this.container.find('button.applyBtn').removeAttr('disabled');
        } else {
            this.container.find('button.applyBtn').attr('disabled', 'disabled');
        }

    },

    move: function() {
        var parentOffset = { top: 0, left: 0 },
            containerTop;
        var parentRightEdge = $(window).width();
        if (!this.parentEl.is('body')) {
            parentOffset = {
                top: this.parentEl.offset().top - this.parentEl.scrollTop(),
                left: this.parentEl.offset().left - this.parentEl.scrollLeft()
            };
            parentRightEdge = this.parentEl[0].clientWidth + this.parentEl.offset().left;
        }

        if (this.drops == 'up')
            containerTop = this.element.offset().top - this.container.outerHeight() - parentOffset.top;
        else
            containerTop = this.element.offset().top + this.element.outerHeight() - parentOffset.top;
        this.container[this.drops == 'up' ? 'addClass' : 'removeClass']('drop-up');

        if (this.opens == 'left') {
            this.container.css({
                top: containerTop,
                right: parentRightEdge - this.element.offset().left - this.element.outerWidth(),
                left: 'auto'
            });
            if (this.container.offset().left < 0) {
                this.container.css({
                    right: 'auto',
                    left: 9
                });
            }
        } else if (this.opens == 'center') {
            this.container.css({
                top: containerTop,
                left: this.element.offset().left - parentOffset.left + this.element.outerWidth() / 2
                        - this.container.outerWidth() / 2,
                right: 'auto'
            });
            if (this.container.offset().left < 0) {
                this.container.css({
                    right: 'auto',
                    left: 9
                });
            }
        } else {
            this.container.css({
                top: containerTop,
                left: this.element.offset().left - parentOffset.left,
                right: 'auto'
            });
            if (this.container.offset().left + this.container.outerWidth() > $(window).width()) {
                this.container.css({
                    left: 'auto',
                    right: 0
                });
            }
        }
    },

    show: function(e) {
        if (this.isShowing) return;

        // Create a click proxy that is private to this instance of datepicker, for unbinding
        this._outsideClickProxy = $.proxy(function(e) { this.outsideClick(e); }, this);

        // Bind global datepicker mousedown for hiding and
        $(document)
          .on('mousedown.daterangepicker', this._outsideClickProxy)
          // also support mobile devices
          .on('touchend.daterangepicker', this._outsideClickProxy)
          // also explicitly play nice with Bootstrap dropdowns, which stopPropagation when clicking them
          .on('click.daterangepicker', '[data-toggle=dropdown]', this._outsideClickProxy)
          // and also close when focus changes to outside the picker (eg. tabbing between controls)
          .on('focusin.daterangepicker', this._outsideClickProxy);

        // Reposition the picker if the window is resized while it's open
        $(window).on('resize.daterangepicker', $.proxy(function(e) { this.move(e); }, this));

        this.oldStartDate = this.startDate.clone();
        this.oldEndDate = this.endDate.clone();
        this.previousRightTime = this.endDate.clone();

        this.updateView();
        this.container.show();
        this.move();
        this.element.trigger('show.daterangepicker', this);
        this.isShowing = true;
    },

    hide: function(e) {
        if (!this.isShowing) return;

        //incomplete date selection, revert to last values
        if (!this.endDate) {
            this.startDate = this.oldStartDate.clone();
            this.endDate = this.oldEndDate.clone();
        }

        //if a new date range was selected, invoke the user callback function
        if (!this.startDate.isSame(this.oldStartDate) || !this.endDate.isSame(this.oldEndDate))
            this.callback(this.startDate.clone(), this.endDate.clone(), this.chosenLabel);

        //if picker is attached to a text input, update it
        this.updateElement();

        $(document).off('.daterangepicker');
        $(window).off('.daterangepicker');
        this.container.hide();
        this.element.trigger('hide.daterangepicker', this);
        this.isShowing = false;
    },

    toggle: function(e) {
        if (this.isShowing) {
            this.hide();
        } else {
            this.show();
        }
    },

    outsideClick: function(e) {
        var target = $(e.target);
        // if the page is clicked anywhere except within the daterangerpicker/button
        // itself then call this.hide()
        if (
            // ie modal dialog fix
            e.type == "focusin" ||
            target.closest(this.element).length ||
            target.closest(this.container).length ||
            target.closest('.calendar-table').length
            ) return;
        this.hide();
        this.element.trigger('outsideClick.daterangepicker', this);
    },

    showCalendars: function() {
        this.container.addClass('show-calendar');
        this.move();
        this.element.trigger('showCalendar.daterangepicker', this);
    },

    hideCalendars: function() {
        this.container.removeClass('show-calendar');
        this.element.trigger('hideCalendar.daterangepicker', this);
    },

    clickRange: function(e) {
        var label = e.target.getAttribute('data-range-key');
        this.chosenLabel = label;
        if (label == this.locale.customRangeLabel) {
            this.showCalendars();
        } else {
            var dates = this.ranges[label];
            this.startDate = dates[0];
            this.endDate = dates[1];

            if (!this.timePicker) {
                this.startDate.startOf('day');
                this.endDate.endOf('day');
            }

            if (!this.alwaysShowCalendars)
                this.hideCalendars();
            this.clickApply();
        }
    },

    clickPrev: function(e) {
        var cal = $(e.target).parents('.drp-calendar');
        if (cal.hasClass('left')) {
            this.leftCalendar.month.subtract(1, 'month');
            if (this.linkedCalendars)
                this.rightCalendar.month.subtract(1, 'month');
        } else {
            this.rightCalendar.month.subtract(1, 'month');
        }
        this.updateCalendars();
    },

    clickNext: function(e) {
        var cal = $(e.target).parents('.drp-calendar');
        if (cal.hasClass('left')) {
            this.leftCalendar.month.add(1, 'month');
        } else {
            this.rightCalendar.month.add(1, 'month');
            if (this.linkedCalendars)
                this.leftCalendar.month.add(1, 'month');
        }
        this.updateCalendars();
    },

    hoverDate: function(e) {

        //ignore dates that can't be selected
        if (!$(e.target).hasClass('available')) return;

        var title = $(e.target).attr('data-title');
        var row = title.substr(1, 1);
        var col = title.substr(3, 1);
        var cal = $(e.target).parents('.drp-calendar');
        var date = cal.hasClass('left') ? this.leftCalendar.calendar[row][col] : this.rightCalendar.calendar[row][col];

        //highlight the dates between the start date and the date being hovered as a potential end date
        var leftCalendar = this.leftCalendar;
        var rightCalendar = this.rightCalendar;
        var startDate = this.startDate;
        if (!this.endDate) {
            this.container.find('.drp-calendar tbody td').each(function(index, el) {

                //skip week numbers, only look at dates
                if ($(el).hasClass('week')) return;

                var title = $(el).attr('data-title');
                var row = title.substr(1, 1);
                var col = title.substr(3, 1);
                var cal = $(el).parents('.drp-calendar');
                var dt = cal.hasClass('left') ? leftCalendar.calendar[row][col] : rightCalendar.calendar[row][col];

                if ((dt.isAfter(startDate) && dt.isBefore(date)) || dt.isSame(date, 'day')) {
                    $(el).addClass('in-range');
                } else {
                    $(el).removeClass('in-range');
                }

            });
        }

    },

    clickDate: function(e) {

        if (!$(e.target).hasClass('available')) return;

        var title = $(e.target).attr('data-title');
        var row = title.substr(1, 1);
        var col = title.substr(3, 1);
        var cal = $(e.target).parents('.drp-calendar');
        var date = cal.hasClass('left') ? this.leftCalendar.calendar[row][col] : this.rightCalendar.calendar[row][col];

        //
        // this function needs to do a few things:
        // * alternate between selecting a start and end date for the range,
        // * if the time picker is enabled, apply the hour/minute/second from the select boxes to the clicked date
        // * if autoapply is enabled, and an end date was chosen, apply the selection
        // * if single date picker mode, and time picker isn't enabled, apply the selection immediately
        // * if one of the inputs above the calendars was focused, cancel that manual input
        //

        if (this.endDate || date.isBefore(this.startDate, 'day')) { //picking start
            if (this.timePicker) {
                var hour = parseInt(this.container.find('.left .hourselect').val(), 10);
                if (!this.timePicker24Hour) {
                    var ampm = this.container.find('.left .ampmselect').val();
                    if (ampm === 'PM' && hour < 12)
                        hour += 12;
                    if (ampm === 'AM' && hour === 12)
                        hour = 0;
                }
                var minute = parseInt(this.container.find('.left .minuteselect').val(), 10);
                var second = this.timePickerSeconds ? parseInt(this.container.find('.left .secondselect').val(), 10) : 0;
                date = date.clone().hour(hour).minute(minute).second(second);
            }
            this.endDate = null;
            this.setStartDate(date.clone());
        } else if (!this.endDate && date.isBefore(this.startDate)) {
            //special case: clicking the same date for start/end,
            //but the time of the end date is before the start date
            this.setEndDate(this.startDate.clone());
        } else { // picking end
            if (this.timePicker) {
                var hour = parseInt(this.container.find('.right .hourselect').val(), 10);
                if (!this.timePicker24Hour) {
                    var ampm = this.container.find('.right .ampmselect').val();
                    if (ampm === 'PM' && hour < 12)
                        hour += 12;
                    if (ampm === 'AM' && hour === 12)
                        hour = 0;
                }
                var minute = parseInt(this.container.find('.right .minuteselect').val(), 10);
                var second = this.timePickerSeconds ? parseInt(this.container.find('.right .secondselect').val(), 10) : 0;
                date = date.clone().hour(hour).minute(minute).second(second);
            }
            this.setEndDate(date.clone());
            if (this.autoApply) {
              this.calculateChosenLabel();
              this.clickApply();
            }
        }

        if (this.singleDatePicker) {
            this.setEndDate(this.startDate);
            if (!this.timePicker)
                this.clickApply();
        }

        this.updateView();

        //This is to cancel the blur event handler if the mouse was in one of the inputs
        e.stopPropagation();

    },

    calculateChosenLabel: function () {
        var customRange = true;
        var i = 0;
        for (var range in this.ranges) {
          if (this.timePicker) {
                var format = this.timePickerSeconds ? "YYYY-MM-DD hh:mm:ss" : "YYYY-MM-DD hh:mm";
                //ignore times when comparing dates if time picker seconds is not enabled
                if (this.startDate.format(format) == this.ranges[range][0].format(format) && this.endDate.format(format) == this.ranges[range][1].format(format)) {
                    customRange = false;
                    this.chosenLabel = this.container.find('.ranges li:eq(' + i + ')').addClass('active').attr('data-range-key');
                    break;
                }
            } else {
                //ignore times when comparing dates if time picker is not enabled
                if (this.startDate.format('YYYY-MM-DD') == this.ranges[range][0].format('YYYY-MM-DD') && this.endDate.format('YYYY-MM-DD') == this.ranges[range][1].format('YYYY-MM-DD')) {
                    customRange = false;
                    this.chosenLabel = this.container.find('.ranges li:eq(' + i + ')').addClass('active').attr('data-range-key');
                    break;
                }
            }
            i++;
        }
        if (customRange) {
            if (this.showCustomRangeLabel) {
                this.chosenLabel = this.container.find('.ranges li:last').addClass('active').attr('data-range-key');
            } else {
                this.chosenLabel = null;
            }
            this.showCalendars();
        }
    },

    clickApply: function(e) {
        this.hide();
        this.element.trigger('apply.daterangepicker', this);
    },

    clickCancel: function(e) {
        this.startDate = this.oldStartDate;
        this.endDate = this.oldEndDate;
        this.hide();
        this.element.trigger('cancel.daterangepicker', this);
    },

    monthOrYearChanged: function(e) {
        var isLeft = $(e.target).closest('.drp-calendar').hasClass('left'),
            leftOrRight = isLeft ? 'left' : 'right',
            cal = this.container.find('.drp-calendar.'+leftOrRight);

        // Month must be Number for new moment versions
        var month = parseInt(cal.find('.monthselect').val(), 10);
        var year = cal.find('.yearselect').val();

        if (!isLeft) {
            if (year < this.startDate.year() || (year == this.startDate.year() && month < this.startDate.month())) {
                month = this.startDate.month();
                year = this.startDate.year();
            }
        }

        if (this.minDate) {
            if (year < this.minDate.year() || (year == this.minDate.year() && month < this.minDate.month())) {
                month = this.minDate.month();
                year = this.minDate.year();
            }
        }

        if (this.maxDate) {
            if (year > this.maxDate.year() || (year == this.maxDate.year() && month > this.maxDate.month())) {
                month = this.maxDate.month();
                year = this.maxDate.year();
            }
        }

        if (isLeft) {
            this.leftCalendar.month.month(month).year(year);
            if (this.linkedCalendars)
                this.rightCalendar.month = this.leftCalendar.month.clone().add(1, 'month');
        } else {
            this.rightCalendar.month.month(month).year(year);
            if (this.linkedCalendars)
                this.leftCalendar.month = this.rightCalendar.month.clone().subtract(1, 'month');
        }
        this.updateCalendars();
    },

    timeChanged: function(e) {

        var cal = $(e.target).closest('.drp-calendar'),
            isLeft = cal.hasClass('left');

        var hour = parseInt(cal.find('.hourselect').val(), 10);
        var minute = parseInt(cal.find('.minuteselect').val(), 10);
        var second = this.timePickerSeconds ? parseInt(cal.find('.secondselect').val(), 10) : 0;

        if (!this.timePicker24Hour) {
            var ampm = cal.find('.ampmselect').val();
            if (ampm === 'PM' && hour < 12)
                hour += 12;
            if (ampm === 'AM' && hour === 12)
                hour = 0;
        }

        if (isLeft) {
            var start = this.startDate.clone();
            start.hour(hour);
            start.minute(minute);
            start.second(second);
            this.setStartDate(start);
            if (this.singleDatePicker) {
                this.endDate = this.startDate.clone();
            } else if (this.endDate && this.endDate.format('YYYY-MM-DD') == start.format('YYYY-MM-DD') && this.endDate.isBefore(start)) {
                this.setEndDate(start.clone());
            }
        } else if (this.endDate) {
            var end = this.endDate.clone();
            end.hour(hour);
            end.minute(minute);
            end.second(second);
            this.setEndDate(end);
        }

        //update the calendars so all clickable dates reflect the new time component
        this.updateCalendars();

        //update the form inputs above the calendars with the new time
        this.updateFormInputs();

        //re-render the time pickers because changing one selection can affect what's enabled in another
        this.renderTimePicker('left');
        this.renderTimePicker('right');

    },

    elementChanged: function() {
        if (!this.element.is('input')) return;
        if (!this.element.val().length) return;

        var dateString = this.element.val().split(this.locale.separator),
            start = null,
            end = null;

        if (dateString.length === 2) {
            start = moment(dateString[0], this.locale.format);
            end = moment(dateString[1], this.locale.format);
        }

        if (this.singleDatePicker || start === null || end === null) {
            start = moment(this.element.val(), this.locale.format);
            end = start;
        }

        if (!start.isValid() || !end.isValid()) return;

        this.setStartDate(start);
        this.setEndDate(end);
        this.updateView();
    },

    keydown: function(e) {
        //hide on tab or enter
        if ((e.keyCode === 9) || (e.keyCode === 13)) {
            this.hide();
        }

        //hide on esc and prevent propagation
        if (e.keyCode === 27) {
            e.preventDefault();
            e.stopPropagation();

            this.hide();
        }
    },

    updateElement: function() {
        if (this.element.is('input') && this.autoUpdateInput) {
            var newValue = this.startDate.format(this.locale.format);
            if (!this.singleDatePicker) {
                newValue += this.locale.separator + this.endDate.format(this.locale.format);
            }
            if (newValue !== this.element.val()) {
                this.element.val(newValue).trigger('change');
            }
        }
    },

    remove: function() {
        this.container.remove();
        this.element.off('.daterangepicker');
        this.element.removeData();
    }

};

$.fn.daterangepicker = function(options, callback) {
    var implementOptions = $.extend(true, {}, $.fn.daterangepicker.defaultOptions, options);
    this.each(function() {
        var el = $(this);
        if (el.data('daterangepicker'))
            el.data('daterangepicker').remove();
        el.data('daterangepicker', new DateRangePicker(el, implementOptions, callback));
    });
    return this;
};

return DateRangePicker;

}));