daterangepicker.js

/**
* @version: 1.3.2
* @author: Dan Grossman http://www.dangrossman.info/
* @date: 2014-01-22
* @copyright: Copyright (c) 2012-2014 Dan Grossman. All rights reserved.
* @license: Licensed under Apache License v2.0. See http://www.apache.org/licenses/LICENSE-2.0
* @website: http://www.improvely.com/
*/
!function ($) {

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

        // by default, the daterangepicker element is placed at the bottom of HTML body
        this.parentEl = 'body';

        //element that triggered the date range picker
        this.element = $(element);

        //create the picker HTML object
        var DRPTemplate = '<div class="daterangepicker dropdown-menu">' +
                '<div class="calendar left"></div>' +
                '<div class="calendar right"></div>' +
                '<div class="ranges">' +
                  '<div class="range_inputs">' +
                    '<div class="daterangepicker_start_input">' +
                      '<label for="daterangepicker_start"></label>' +
                      '<input class="input-mini" type="text" name="daterangepicker_start" value="" disabled="disabled" />' +
                    '</div>' +
                    '<div class="daterangepicker_end_input">' +
                      '<label for="daterangepicker_end"></label>' +
                      '<input class="input-mini" type="text" name="daterangepicker_end" value="" disabled="disabled" />' +
                    '</div>' +
                    '<button class="applyBtn" disabled="disabled"></button>&nbsp;' +
                    '<button class="cancelBtn"></button>' +
                  '</div>' +
                '</div>' +
              '</div>';

        this.parentEl = (typeof options == 'object' && options.parentEl && $(options.parentEl)) || $(this.parentEl);
        this.container = $(DRPTemplate).appendTo(this.parentEl);

        //custom options
        if (typeof options != 'object')
            options = {};
        this.setOptions(options, cb);

        //apply CSS classes and labels to buttons
        var c = this.container;
        $.each(this.buttonClasses, function (idx, val) {
            c.find('button').addClass(val);
        });
        this.container.find('.daterangepicker_start_input label').html(this.locale.fromLabel);
        this.container.find('.daterangepicker_end_input label').html(this.locale.toLabel);
        if (this.applyClass.length)
            this.container.find('.applyBtn').addClass(this.applyClass);
        if (this.cancelClass.length)
            this.container.find('.cancelBtn').addClass(this.cancelClass);
        this.container.find('.applyBtn').html(this.locale.applyLabel);
        this.container.find('.cancelBtn').html(this.locale.cancelLabel);

        //event listeners
        this.container.on('mousedown', $.proxy(this.mousedown, this));

        this.container.find('.calendar')
            .on('click', '.prev', $.proxy(this.clickPrev, this))
            .on('click', '.next', $.proxy(this.clickNext, this))
            .on('click', 'td.available', $.proxy(this.clickDate, this))
            .on('mouseenter', 'td.available', $.proxy(this.enterDate, this))
            .on('mouseleave', 'td.available', $.proxy(this.updateFormInputs, this))
            .on('change', 'select.yearselect', $.proxy(this.updateMonthYear, this))
            .on('change', 'select.monthselect', $.proxy(this.updateMonthYear, this))
            .on('change', 'select.hourselect,select.minuteselect,select.ampmselect', $.proxy(this.updateTime, this));

        this.container.find('.ranges')
            .on('click', 'button.applyBtn', $.proxy(this.clickApply, this))
            .on('click', 'button.cancelBtn', $.proxy(this.clickCancel, this))
            .on('click', '.daterangepicker_start_input,.daterangepicker_end_input', $.proxy(this.showCalendars, this))
            .on('click', 'li', $.proxy(this.clickRange, this))
            .on('mouseenter', 'li', $.proxy(this.enterRange, this))
            .on('mouseleave', 'li', $.proxy(this.updateFormInputs, this));

        if (this.element.is('input')) {
            this.element.on({
                'click.daterangepicker': $.proxy(this.show, this),
                'focus.daterangepicker': $.proxy(this.show, this),
                'keyup.daterangepicker': $.proxy(this.updateFromControl, this)
            });
        } else {
            this.element.on('click.daterangepicker', $.proxy(this.show, this));
        }

    };

    DateRangePicker.prototype = {

        constructor: DateRangePicker,

        setOptions: function(options, callback) {

            this.startDate = moment().startOf('day');
            this.endDate = moment().startOf('day');
            this.minDate = false;
            this.maxDate = false;
            this.dateLimit = false;

            this.showDropdowns = false;
            this.showWeekNumbers = false;
            this.timePicker = false;
            this.timePickerIncrement = 30;
            this.timePicker12Hour = true;
            this.singleDatePicker = false;
            this.ranges = {};

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

            this.buttonClasses = ['btn', 'btn-small'];
            this.applyClass = 'btn-success';
            this.cancelClass = 'btn-default';

            this.format = 'MM/DD/YYYY';
            this.separator = ' - ';

            this.locale = {
                applyLabel: 'Apply',
                cancelLabel: 'Cancel',
                fromLabel: 'From',
                toLabel: 'To',
                weekLabel: 'W',
                customRangeLabel: 'Custom Range',
                daysOfWeek: moment()._lang._weekdaysMin.slice(),
                monthNames: moment()._lang._monthsShort.slice(),
                firstDay: 0
            };

            this.selectedRangeLabel = '';

            this.cb = function () { };

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

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

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

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

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

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

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

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

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

            // update day names order to firstDay
            if (typeof options.locale == 'object') {

                if (typeof options.locale.daysOfWeek == 'object') {
                    // Create a copy of daysOfWeek to avoid modification of original
                    // options object for reusability in multiple daterangepicker instances
                    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;
                    var iterator = options.locale.firstDay;
                    while (iterator > 0) {
                        this.locale.daysOfWeek.push(this.locale.daysOfWeek.shift());
                        iterator--;
                    }
                }

                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.fromLabel == 'string') {
                  this.locale.fromLabel = options.locale.fromLabel;
                }

                if (typeof options.locale.toLabel == 'string') {
                  this.locale.toLabel = options.locale.toLabel;
                }

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

                if (typeof options.locale.customRangeLabel == 'string') {
                  this.locale.customRangeLabel = options.locale.customRangeLabel;
                }
            }

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

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

            if (typeof options.buttonClasses == 'string') {
                this.buttonClasses = [options.buttonClasses];
            }

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

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

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

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

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

            if (typeof options.timePicker12Hour == 'boolean') {
                this.timePicker12Hour = options.timePicker12Hour;
            }

            //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('input[type=text]')) {
                    var val = $(this.element).val();
                    var split = val.split(this.separator);
                    var start, end;
                    if (split.length == 2) {
                        start = moment(split[0], this.format);
                        end = moment(split[1], this.format);
                    } else if (this.singleDatePicker) {
                        start = moment(val, this.format);
                        end = moment(val, this.format);
                    }
                    if (start != null && end != null) {
                        this.startDate = start;
                        this.endDate = end;
                    }
                }
            }

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

                    var start = moment(options.ranges[range][0]);
                    var end = moment(options.ranges[range][1]);

                    // If we have a min/max date set, bound this range
                    // to it, but only if it would otherwise fall
                    // outside of the min/max.
                    if (this.minDate && start.isBefore(this.minDate))
                        start = moment(this.minDate);

                    if (this.maxDate && end.isAfter(this.maxDate))
                        end = moment(this.maxDate);

                    // If the end of the range is before the minimum (if min is set) OR
                    // the start of the range is after the max (also if set) don't display this
                    // range option.
                    if ((this.minDate && end.isBefore(this.minDate)) || (this.maxDate && start.isAfter(this.maxDate))) {
                        continue;
                    }

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

                var list = '<ul>';
                for (var range in this.ranges) {
                    list += '<li>' + range + '</li>';
                }
                list += '<li>' + this.locale.customRangeLabel + '</li>';
                list += '</ul>';
                this.container.find('.ranges ul').remove();
                this.container.find('.ranges').prepend(list);
            }

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

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

            if (this.singleDatePicker) {
                this.opens = 'right';
                this.container.find('.calendar.right').show();
                this.container.find('.calendar.left').hide();
                this.container.find('.ranges').hide();
                if (!this.container.find('.calendar.right').hasClass('single'))
                    this.container.find('.calendar.right').addClass('single');
            } else {
                this.container.find('.calendar.right').removeClass('single');
                this.container.find('.ranges').show();
            }

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

            this.leftCalendar = {
                month: moment([this.startDate.year(), this.startDate.month(), 1, this.startDate.hour(), this.startDate.minute()]),
                calendar: []
            };

            this.rightCalendar = {
                month: moment([this.endDate.year(), this.endDate.month(), 1, this.endDate.hour(), this.endDate.minute()]),
                calendar: []
            };

            if (this.opens == 'right') {
                //swap calendar positions
                var left = this.container.find('.calendar.left');
                var right = this.container.find('.calendar.right');
                left.removeClass('left').addClass('right');
                right.removeClass('right').addClass('left');
            }

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

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

            this.updateView();
            this.updateCalendars()

        },

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

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

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

            this.oldStartDate = this.startDate.clone();

            this.updateView();
            this.updateCalendars();
        },

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

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

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

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

            this.updateView();
            this.updateCalendars();
        },

        mousedown: function (e) {
            e.stopPropagation();
        },

        updateView: function () {
            this.leftCalendar.month.month(this.startDate.month()).year(this.startDate.year());
            this.rightCalendar.month.month(this.endDate.month()).year(this.endDate.year());
            this.updateFormInputs();
        },

        updateFormInputs: function () {
            this.container.find('input[name=daterangepicker_start]').val(this.startDate.format(this.format));
            this.container.find('input[name=daterangepicker_end]').val(this.endDate.format(this.format));

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

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

            var dateString = this.element.val().split(this.separator);
            var start = moment(dateString[0], this.format);
            var end = moment(dateString[1], this.format);

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

            if (start == null || end == null) return;
            if (end.isBefore(start)) return;

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

            this.startDate = start;
            this.endDate = end;

            if (!this.startDate.isSame(this.oldStartDate) || !this.endDate.isSame(this.oldEndDate))
                this.notify();

            this.updateCalendars();
        },

        notify: function () {
            this.updateView();
            this.cb(this.startDate, this.endDate, this.selectedRangeLabel);
        },

        move: function () {
            var parentOffset = { top: 0, left: 0 };
            if (!this.parentEl.is('body')) {
                parentOffset = {
                    top: this.parentEl.offset().top - this.parentEl.scrollTop(),
                    left: this.parentEl.offset().left - this.parentEl.scrollLeft()
                };
            }
            
            if (this.opens == 'left') {
                this.container.css({
                    top: this.element.offset().top + this.element.outerHeight() - parentOffset.top,
                    right: $(window).width() - this.element.offset().left - this.element.outerWidth() - parentOffset.left,
                    left: 'auto'
                });
                if (this.container.offset().left < 0) {
                    this.container.css({
                        right: 'auto',
                        left: 9
                    });
                }
            } else {
                this.container.css({
                    top: this.element.offset().top + this.element.outerHeight() - parentOffset.top,
                    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) {
            this.container.show();
            this.move();

            if (e) {
                e.stopPropagation();
                e.preventDefault();
            }

            $(document).on('mousedown', $.proxy(this.hide, this));
            this.element.trigger('show', this);
        },

        hide: function (e) {
            this.container.hide();

            if (!this.startDate.isSame(this.oldStartDate) || !this.endDate.isSame(this.oldEndDate))
                this.notify();

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

            $(document).off('mousedown', this.hide);
            this.element.trigger('hide', this);
        },

        enterRange: function (e) {
            var label = e.target.innerHTML;
            if (label == this.locale.customRangeLabel) {
                this.updateView();
            } else {
                var dates = this.ranges[label];
                this.container.find('input[name=daterangepicker_start]').val(dates[0].format(this.format));
                this.container.find('input[name=daterangepicker_end]').val(dates[1].format(this.format));
            }
        },

        showCalendars: function() {
            this.container.find('.calendar').show();
            this.move();
        },

        updateInputText: function() {
            if (this.element.is('input') && !this.singleDatePicker) {
                this.element.val(this.startDate.format(this.format) + this.separator + this.endDate.format(this.format));
            } else if (this.element.is('input')) {
                this.element.val(this.startDate.format(this.format));
            }

        },

        clickRange: function (e) {
            var label = e.target.innerHTML;
            if (label == this.locale.customRangeLabel) {
                this.selectedRangeLabel = this.locale.customRangeLabel;
                this.showCalendars();
            } else {
                this.selectedRangeLabel = label;
                var dates = this.ranges[label];

                this.startDate = dates[0];
                this.endDate = dates[1];

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

                this.leftCalendar.month.month(this.startDate.month()).year(this.startDate.year()).hour(this.startDate.hour()).minute(this.startDate.minute());
                this.rightCalendar.month.month(this.endDate.month()).year(this.endDate.year()).hour(this.endDate.hour()).minute(this.endDate.minute());
                this.updateCalendars();

                this.updateInputText();

                this.container.find('.calendar').hide();
                this.hide();
                this.element.trigger('apply', this);
            }
        },

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

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

        enterDate: function (e) {

            var title = $(e.target).attr('data-title');
            var row = title.substr(1, 1);
            var col = title.substr(3, 1);
            var cal = $(e.target).parents('.calendar');

            if (cal.hasClass('left')) {
                this.container.find('input[name=daterangepicker_start]').val(this.leftCalendar.calendar[row][col].format(this.format));
            } else {
                this.container.find('input[name=daterangepicker_end]').val(this.rightCalendar.calendar[row][col].format(this.format));
            }

        },

        clickDate: function (e) {
            var title = $(e.target).attr('data-title');
            var row = title.substr(1, 1);
            var col = title.substr(3, 1);
            var cal = $(e.target).parents('.calendar');

            if (cal.hasClass('left')) {
                var startDate = this.leftCalendar.calendar[row][col];
                var endDate = this.endDate;
                if (typeof this.dateLimit == 'object') {
                    var maxDate = moment(startDate).add(this.dateLimit).startOf('day');
                    if (endDate.isAfter(maxDate)) {
                        endDate = maxDate;
                    }
                }
            } else {
                var startDate = this.startDate;
                var endDate = this.rightCalendar.calendar[row][col];
                if (typeof this.dateLimit == 'object') {
                    var minDate = moment(endDate).subtract(this.dateLimit).startOf('day');
                    if (startDate.isBefore(minDate)) {
                        startDate = minDate;
                    }
                }
            }

            if (this.singleDatePicker && cal.hasClass('left')) {
                endDate = startDate;
            } else if (this.singleDatePicker && cal.hasClass('right')) {
                startDate = endDate;
            }

            cal.find('td').removeClass('active');

            if (startDate.isSame(endDate) || startDate.isBefore(endDate)) {
                $(e.target).addClass('active');
                this.startDate = startDate;
                this.endDate = endDate;
            } else if (startDate.isAfter(endDate)) {
                $(e.target).addClass('active');
                this.startDate = startDate;
                this.endDate = moment(startDate).add('day', 1).startOf('day');
            }

            this.leftCalendar.month.month(this.startDate.month()).year(this.startDate.year());
            this.rightCalendar.month.month(this.endDate.month()).year(this.endDate.year());
            this.updateCalendars();

            if (this.singleDatePicker)
                this.clickApply();
        },

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

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

        updateMonthYear: function (e) {

            var isLeft = $(e.target).closest('.calendar').hasClass('left');
            var cal = this.container.find('.calendar.left');
            if (!isLeft)
                cal = this.container.find('.calendar.right');

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

            if (isLeft) {
                this.leftCalendar.month.month(month).year(year);
            } else {
                this.rightCalendar.month.month(month).year(year);
            }

            this.updateCalendars();

        },

        updateTime: function(e) {

            var isLeft = $(e.target).closest('.calendar').hasClass('left');
            var cal = this.container.find('.calendar.left');
            if (!isLeft)
                cal = this.container.find('.calendar.right');

            var hour = parseInt(cal.find('.hourselect').val());
            var minute = parseInt(cal.find('.minuteselect').val());

            if (this.timePicker12Hour) {
                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);
                this.startDate = start;
                this.leftCalendar.month.hour(hour).minute(minute);
            } else {
                var end = this.endDate.clone();
                end.hour(hour);
                end.minute(minute);
                this.endDate = end;
                this.rightCalendar.month.hour(hour).minute(minute);
            }

            this.updateCalendars();

        },

        updateCalendars: function () {
            this.leftCalendar.calendar = this.buildCalendar(this.leftCalendar.month.month(), this.leftCalendar.month.year(), this.leftCalendar.month.hour(), this.leftCalendar.month.minute(), 'left');
            this.rightCalendar.calendar = this.buildCalendar(this.rightCalendar.month.month(), this.rightCalendar.month.year(), this.rightCalendar.month.hour(), this.rightCalendar.month.minute(), 'right');
            this.container.find('.calendar.left').html(this.renderCalendar(this.leftCalendar.calendar, this.startDate, this.minDate, this.maxDate));
            this.container.find('.calendar.right').html(this.renderCalendar(this.rightCalendar.calendar, this.endDate, this.startDate, this.maxDate));

            this.container.find('.ranges li').removeClass('active');
            var customRange = true;
            var i = 0;
            for (var range in this.ranges) {
                if (this.timePicker) {
                    if (this.startDate.isSame(this.ranges[range][0]) && this.endDate.isSame(this.ranges[range][1])) {
                        customRange = false;
                        this.container.find('.ranges li:eq(' + i + ')').addClass('active');
                    }
                } 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.container.find('.ranges li:eq(' + i + ')').addClass('active');
                    }
                }
                i++;
            }
            if (customRange)
                this.container.find('.ranges li:last').addClass('active');
        },

        buildCalendar: function (month, year, hour, minute, side) {

            var firstDay = moment([year, month, 1]);
            var lastMonth = moment(firstDay).subtract('month', 1).month();
            var lastYear = moment(firstDay).subtract('month', 1).year();

            var daysInLastMonth = moment([lastYear, lastMonth]).daysInMonth();

            var dayOfWeek = firstDay.day();

            //initialize a 6 rows x 7 columns array for the calendar
            var calendar = [];
            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]);
            for (var i = 0, col = 0, row = 0; i < 42; i++, col++, curDate = moment(curDate).add('hour', 24)) {
                if (i > 0 && col % 7 == 0) {
                    col = 0;
                    row++;
                }
                calendar[row][col] = curDate.clone().hour(hour);
                curDate.hour(12);
            }

            return calendar;

        },

        renderDropdowns: function (selected, minDate, maxDate) {
            var currentMonth = selected.month();
            var monthHtml = '<select class="monthselect">';
            var inMinYear = false;
            var inMaxYear = false;

            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>";
                }
            }
            monthHtml += "</select>";

            var currentYear = selected.year();
            var maxYear = (maxDate && maxDate.year()) || (currentYear + 5);
            var minYear = (minDate && minDate.year()) || (currentYear - 50);
            var yearHtml = '<select class="yearselect">';

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

            yearHtml += '</select>';

            return monthHtml + yearHtml;
        },

        renderCalendar: function (calendar, selected, minDate, maxDate) {

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

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

            if (!minDate || minDate.isBefore(calendar[1][1])) {
                html += '<th class="prev available"><i class="fa fa-arrow-left icon-arrow-left glyphicon glyphicon-arrow-left"></i></th>';
            } else {
                html += '<th></th>';
            }

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

            if (this.showDropdowns) {
                dateHtml = this.renderDropdowns(calendar[1][1], minDate, maxDate);
            }

            html += '<th colspan="5" class="month">' + dateHtml + '</th>';
            if (!maxDate || maxDate.isAfter(calendar[1][1])) {
                html += '<th class="next available"><i class="fa fa-arrow-right icon-arrow-right glyphicon glyphicon-arrow-right"></i></th>';
            } else {
                html += '<th></th>';
            }

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

            // add week number label
            if (this.showWeekNumbers)
                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>';

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

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

                for (var col = 0; col < 7; col++) {
                    var cname = 'available ';
                    cname += (calendar[row][col].month() == calendar[1][1].month()) ? '' : 'off';

                    if ((minDate && calendar[row][col].isBefore(minDate)) || (maxDate && calendar[row][col].isAfter(maxDate))) {
                        cname = ' off disabled ';
                    } else if (calendar[row][col].format('YYYY-MM-DD') == selected.format('YYYY-MM-DD')) {
                        cname += ' active ';
                        if (calendar[row][col].format('YYYY-MM-DD') == this.startDate.format('YYYY-MM-DD')) {
                            cname += ' start-date ';
                        }
                        if (calendar[row][col].format('YYYY-MM-DD') == this.endDate.format('YYYY-MM-DD')) {
                            cname += ' end-date ';
                        }
                    } else if (calendar[row][col] >= this.startDate && calendar[row][col] <= this.endDate) {
                        cname += ' in-range ';
                        if (calendar[row][col].isSame(this.startDate)) { cname += ' start-date '; }
                        if (calendar[row][col].isSame(this.endDate)) { cname += ' end-date '; }
                    }

                    var title = 'r' + row + 'c' + col;
                    html += '<td class="' + cname.replace(/\s+/g, ' ').replace(/^\s?(.*?)\s?$/, '$1') + '" data-title="' + title + '">' + calendar[row][col].date() + '</td>';
                }
                html += '</tr>';
            }

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

            if (this.timePicker) {

                html += '<div class="calendar-time">';
                html += '<select class="hourselect">';
                var start = 0;
                var end = 23;
                var selected_hour = selected.hour();
                if (this.timePicker12Hour) {
                    start = 1;
                    end = 12;
                    if (selected_hour >= 12)
                        selected_hour -= 12;
                    if (selected_hour == 0)
                        selected_hour = 12;
                }

                for (var i = start; i <= end; i++) {
                    if (i == selected_hour) {
                        html += '<option value="' + i + '" selected="selected">' + i + '</option>';
                    } else {
                        html += '<option value="' + i + '">' + i + '</option>';
                    }
                }

                html += '</select> : ';

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

                for (var i = 0; i < 60; i += this.timePickerIncrement) {
                    var num = i;
                    if (num < 10)
                        num = '0' + num;
                    if (i == selected.minute()) {
                        html += '<option value="' + i + '" selected="selected">' + num + '</option>';
                    } else {
                        html += '<option value="' + i + '">' + num + '</option>';
                    }
                }

                html += '</select> ';

                if (this.timePicker12Hour) {
                    html += '<select class="ampmselect">';
                    if (selected.hour() >= 12) {
                        html += '<option value="AM">AM</option><option value="PM" selected="selected">PM</option>';
                    } else {
                        html += '<option value="AM" selected="selected">AM</option><option value="PM">PM</option>';
                    }
                    html += '</select>';
                }

                html += '</div>';

            }

            return html;

        },

        remove: function() {

            this.container.remove();
            this.element.off('.daterangepicker');
            this.element.removeData('daterangepicker');

        }

    };

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

}(window.jQuery);