✏️ Editing: bootstrap-datepicker.js

/* =========================================================
 * bootstrap-datepicker.js
 * Repo: https://github.com/eternicode/bootstrap-datepicker/
 * Demo: http://eternicode.github.io/bootstrap-datepicker/
 * Docs: http://bootstrap-datepicker.readthedocs.org/
 * Forked from http://www.eyecon.ro/bootstrap-datepicker
 * =========================================================
 * Started by Stefan Petre; improvements by Andrew Rowls + contributors
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 * ========================================================= */

(function($, undefined){

var $window = $(window);

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

// Picker object

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

this._process_options(options);

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

this.picker = $(DPGlobal.template);
		this._buildEvents();
		this._attachEvents();

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

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

this.viewMode = this.o.startView;

if (this.o.calendarWeeks)
			this.picker.find('tfoot th.today')
						.attr('colspan', function(i, val){
							return parseInt(val) + 1;
						});

this._allow_update = false;

this.setStartDate(this._o.startDate);
		this.setEndDate(this._o.endDate);
		this.setDaysOfWeekDisabled(this.o.daysOfWeekDisabled);

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

this._allow_update = true;

this.update();
		this.showMode();

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

Datepicker.prototype = {
		constructor: Datepicker,

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

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

switch (o.startView){
				case 2:
				case 'decade':
					o.startView = 2;
					break;
				case 1:
				case 'year':
					o.startView = 1;
					break;
				default:
					o.startView = 0;
			}

switch (o.minViewMode){
				case 1:
				case 'months':
					o.minViewMode = 1;
					break;
				case 2:
				case 'years':
					o.minViewMode = 2;
					break;
				default:
					o.minViewMode = 0;
			}

o.startView = Math.max(o.startView, o.minViewMode);

// true, false, or Number > 0
			if (o.multidate !== true){
				o.multidate = Number(o.multidate) || false;
				if (o.multidate !== false)
					o.multidate = Math.max(0, o.multidate);
				else
					o.multidate = 1;
			}
			o.multidateSeparator = String(o.multidateSeparator);

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

o.daysOfWeekDisabled = o.daysOfWeekDisabled||[];
			if (!$.isArray(o.daysOfWeekDisabled))
				o.daysOfWeekDisabled = o.daysOfWeekDisabled.split(/[,\s]*/);
			o.daysOfWeekDisabled = $.map(o.daysOfWeekDisabled, function(d){
				return parseInt(d, 10);
			});

_plc = $.grep(plc, function(word){
					return (/^top|bottom$/).test(word);
				});
				o.orientation.y = _plc[0] || 'auto';
			}
		},
		_events: [],
		_secondaryEvents: [],
		_applyEvents: function(evs){
			for (var i=0, el, ch, ev; i < evs.length; i++){
				el = evs[i][0];
				if (evs[i].length === 2){
					ch = undefined;
					ev = evs[i][1];
				}
				else if (evs[i].length === 3){
					ch = evs[i][1];
					ev = evs[i][2];
				}
				el.on(ev, ch);
			}
		},
		_unapplyEvents: function(evs){
			for (var i=0, el, ev, ch; i < evs.length; i++){
				el = evs[i][0];
				if (evs[i].length === 2){
					ch = undefined;
					ev = evs[i][1];
				}
				else if (evs[i].length === 3){
					ch = evs[i][1];
					ev = evs[i][2];
				}
				el.off(ev, ch);
			}
		},
		_buildEvents: function(){
			if (this.isInput){ // single input
				this._events = [
					[this.element, {
						focus: $.proxy(this.show, this),
						keyup: $.proxy(function(e){
							if ($.inArray(e.keyCode, [27,37,39,38,40,32,13,9]) === -1)
								this.update();
						}, this),
						keydown: $.proxy(this.keydown, this)
					}]
				];
			}
			else if (this.component && this.hasInput){ // component: input + button
				this._events = [
					// For components that are not readonly, allow keyboard nav
					[this.element.find('input'), {
						focus: $.proxy(this.show, this),
						keyup: $.proxy(function(e){
							if ($.inArray(e.keyCode, [27,37,39,38,40,32,13,9]) === -1)
								this.update();
						}, this),
						keydown: $.proxy(this.keydown, this)
					}],
					[this.component, {
						click: $.proxy(this.show, this)
					}]
				];
			}
			else if (this.element.is('div')){  // inline datepicker
				this.isInline = true;
			}
			else {
				this._events = [
					[this.element, {
						click: $.proxy(this.show, this)
					}]
				];
			}
			this._events.push(
				// Component: listen for blur on element descendants
				[this.element, '*', {
					blur: $.proxy(function(e){
						this._focused_from = e.target;
					}, this)
				}],
				// Input: listen for blur on element
				[this.element, {
					blur: $.proxy(function(e){
						this._focused_from = e.target;
					}, this)
				}]
			);

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

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

show: function(){
			if (!this.isInline)
				this.picker.appendTo('body');
			this.picker.show();
			this.place();
			this._attachSecondaryEvents();
			this._trigger('show');
		},

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

if (
				this.o.forceParse &&
				(
					this.isInput && this.element.val() ||
					this.hasInput && this.element.find('input').val()
				)
			)
				this.setValue();
			this._trigger('hide');
		},

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

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

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

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

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

getUTCDate: function(){
			return new Date(this.dates.get(-1));
		},

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

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

setDate: alias('setDates'),
		setUTCDate: alias('setUTCDates'),

setValue: function(){
			var formatted = this.getFormattedDate();
			if (!this.isInput){
				if (this.component){
					this.element.find('input').val(formatted).change();
				}
			}
			else {
				this.element.val(formatted).change();
			}
		},

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

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

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

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

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

place: function(){
			if (this.isInline)
				return;
			var calendarWidth = this.picker.outerWidth(),
				calendarHeight = this.picker.outerHeight(),
				visualPadding = 10,
				windowWidth = $window.width(),
				windowHeight = $window.height(),
				scrollTop = $window.scrollTop();

var zIndex = parseInt(this.element.parents().filter(function(){
					return $(this).css('z-index') !== 'auto';
				}).first().css('z-index'))+10;
			var offset = this.component ? this.component.parent().offset() : this.element.offset();
			var height = this.component ? this.component.outerHeight(true) : this.element.outerHeight(false);
			var width = this.component ? this.component.outerWidth(true) : this.element.outerWidth(false);
			var left = offset.left,
				top = offset.top;

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

if (this.o.orientation.x !== 'auto'){
				this.picker.addClass('datepicker-orient-' + this.o.orientation.x);
				if (this.o.orientation.x === 'right')
					left -= calendarWidth - width;
			}
			// auto x orientation is best-placement: if it crosses a window
			// edge, fudge it sideways
			else {
				// Default to left
				this.picker.addClass('datepicker-orient-left');
				if (offset.left < 0)
					left -= offset.left - visualPadding;
				else if (offset.left + calendarWidth > windowWidth)
					left = windowWidth - calendarWidth - visualPadding;
			}

// auto y orientation is best-situation: top or bottom, no fudging,
			// decision based on which shows more of the calendar
			var yorient = this.o.orientation.y,
				top_overflow, bottom_overflow;
			if (yorient === 'auto'){
				top_overflow = -scrollTop + offset.top - calendarHeight;
				bottom_overflow = scrollTop + windowHeight - (offset.top + height + calendarHeight);
				if (Math.max(top_overflow, bottom_overflow) === bottom_overflow)
					yorient = 'top';
				else
					yorient = 'bottom';
			}
			this.picker.addClass('datepicker-orient-' + yorient);
			if (yorient === 'top')
				top += height;
			else
				top -= calendarHeight + parseInt(this.picker.css('padding-top'));

this.picker.css({
				top: top,
				left: left,
				zIndex: zIndex
			});
		},

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

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

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

if (fromArgs){
				// setting date by clicking
				this.setValue();
			}
			else if (dates.length){
				// setting date by typing
				if (String(oldDates) !== String(this.dates))
					this._trigger('changeDate');
			}
			if (!this.dates.length && oldDates.length)
				this._trigger('clearDate');

this.fill();
		},

fillDow: function(){
			var dowCnt = this.o.weekStart,
				html = '<tr>';
			if (this.o.calendarWeeks){
				var cell = '<th class="cw">&nbsp;</th>';
				html += cell;
				this.picker.find('.datepicker-days thead tr:first-child').prepend(cell);
			}
			while (dowCnt < this.o.weekStart + 7){
				html += '<th class="dow">'+dates[this.o.language].daysMin[(dowCnt++)%7]+'</th>';
			}
			html += '</tr>';
			this.picker.find('.datepicker-days thead').append(html);
		},

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

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

getClassNames: function(date){
			var cls = [],
				year = this.viewDate.getUTCFullYear(),
				month = this.viewDate.getUTCMonth(),
				today = new Date();
			if (date.getUTCFullYear() < year || (date.getUTCFullYear() === year && date.getUTCMonth() < month)){
				cls.push('old');
			}
			else if (date.getUTCFullYear() > year || (date.getUTCFullYear() === year && date.getUTCMonth() > month)){
				cls.push('new');
			}
			if (this.focusDate && date.valueOf() === this.focusDate.valueOf())
				cls.push('focused');
			// Compare internal UTC date with local today, not UTC today
			if (this.o.todayHighlight &&
				date.getUTCFullYear() === today.getFullYear() &&
				date.getUTCMonth() === today.getMonth() &&
				date.getUTCDate() === today.getDate()){
				cls.push('today');
			}
			if (this.dates.contains(date) !== -1)
				cls.push('active');
			if (date.valueOf() < this.o.startDate || date.valueOf() > this.o.endDate ||
				$.inArray(date.getUTCDay(), this.o.daysOfWeekDisabled) !== -1){
				cls.push('disabled');
			}
			if (this.range){
				if (date > this.range[0] && date < this.range[this.range.length-1]){
					cls.push('range');
				}
				if ($.inArray(date.valueOf(), this.range) !== -1){
					cls.push('selected');
				}
			}
			return cls;
		},

fill: function(){
			var d = new Date(this.viewDate),
				year = d.getUTCFullYear(),
				month = d.getUTCMonth(),
				startYear = this.o.startDate !== -Infinity ? this.o.startDate.getUTCFullYear() : -Infinity,
				startMonth = this.o.startDate !== -Infinity ? this.o.startDate.getUTCMonth() : -Infinity,
				endYear = this.o.endDate !== Infinity ? this.o.endDate.getUTCFullYear() : Infinity,
				endMonth = this.o.endDate !== Infinity ? this.o.endDate.getUTCMonth() : Infinity,
				todaytxt = dates[this.o.language].today || dates['en'].today || '',
				cleartxt = dates[this.o.language].clear || dates['en'].clear || '',
				tooltip;
			this.picker.find('.datepicker-days thead th.datepicker-switch')
						.text(dates[this.o.language].months[month]+' '+year);
			this.picker.find('tfoot th.today')
						.text(todaytxt)
						.toggle(this.o.todayBtn !== false);
			this.picker.find('tfoot th.clear')
						.text(cleartxt)
						.toggle(this.o.clearBtn !== false);
			this.updateNavArrows();
			this.fillMonths();
			var prevMonth = UTCDate(year, month-1, 28),
				day = DPGlobal.getDaysInMonth(prevMonth.getUTCFullYear(), prevMonth.getUTCMonth());
			prevMonth.setUTCDate(day);
			prevMonth.setUTCDate(day - (prevMonth.getUTCDay() - this.o.weekStart + 7)%7);
			var nextMonth = new Date(prevMonth);
			nextMonth.setUTCDate(nextMonth.getUTCDate() + 42);
			nextMonth = nextMonth.valueOf();
			var html = [];
			var clsName;
			while (prevMonth.valueOf() < nextMonth){
				if (prevMonth.getUTCDay() === this.o.weekStart){
					html.push('<tr>');
					if (this.o.calendarWeeks){
						// ISO 8601: First week contains first thursday.
						// ISO also states week starts on Monday, but we can be more abstract here.
						var
							// Start of current week: based on weekstart/current date
							ws = new Date(+prevMonth + (this.o.weekStart - prevMonth.getUTCDay() - 7) % 7 * 864e5),
							// Thursday of this week
							th = new Date(Number(ws) + (7 + 4 - ws.getUTCDay()) % 7 * 864e5),
							// First Thursday of year, year from thursday
							yth = new Date(Number(yth = UTCDate(th.getUTCFullYear(), 0, 1)) + (7 + 4 - yth.getUTCDay())%7*864e5),
							// Calendar week: ms between thursdays, div ms per day, div 7 days
							calWeek =  (th - yth) / 864e5 / 7 + 1;
						html.push('<td class="cw">'+ calWeek +'</td>');

}
				}
				clsName = this.getClassNames(prevMonth);
				clsName.push('day');

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

clsName = $.unique(clsName);
				html.push('<td class="'+clsName.join(' ')+'"' + (tooltip ? ' title="'+tooltip+'"' : '') + '>'+prevMonth.getUTCDate() + '</td>');
				if (prevMonth.getUTCDay() === this.o.weekEnd){
					html.push('</tr>');
				}
				prevMonth.setUTCDate(prevMonth.getUTCDate()+1);
			}
			this.picker.find('.datepicker-days tbody').empty().append(html.join(''));

var months = this.picker.find('.datepicker-months')
						.find('th:eq(1)')
							.text(year)
							.end()
						.find('span').removeClass('active');

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

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

html = '';
			year = parseInt(year/10, 10) * 10;
			var yearCont = this.picker.find('.datepicker-years')
								.find('th:eq(1)')
									.text(year + '-' + (year + 9))
									.end()
								.find('td');
			year -= 1;
			var years = $.map(this.dates, function(d){
					return d.getUTCFullYear();
				}),
				classes;
			for (var i = -1; i < 11; i++){
				classes = ['year'];
				if (i === -1)
					classes.push('old');
				else if (i === 10)
					classes.push('new');
				if ($.inArray(year, years) !== -1)
					classes.push('active');
				if (year < startYear || year > endYear)
					classes.push('disabled');
				html += '<span class="' + classes.join(' ') + '">'+year+'</span>';
				year += 1;
			}
			yearCont.html(html);
		},

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

click: function(e){
			e.preventDefault();
			var target = $(e.target).closest('span, td, th'),
				year, month, day;
			if (target.length === 1){
				switch (target[0].nodeName.toLowerCase()){
					case 'th':
						switch (target[0].className){
							case 'datepicker-switch':
								this.showMode(1);
								break;
							case 'prev':
							case 'next':
								var dir = DPGlobal.modes[this.viewMode].navStep * (target[0].className === 'prev' ? -1 : 1);
								switch (this.viewMode){
									case 0:
										this.viewDate = this.moveMonth(this.viewDate, dir);
										this._trigger('changeMonth', this.viewDate);
										break;
									case 1:
									case 2:
										this.viewDate = this.moveYear(this.viewDate, dir);
										if (this.viewMode === 1)
											this._trigger('changeYear', this.viewDate);
										break;
								}
								this.fill();
								break;
							case 'today':
								var date = new Date();
								date = UTCDate(date.getFullYear(), date.getMonth(), date.getDate(), 0, 0, 0);

this.showMode(-2);
								var which = this.o.todayBtn === 'linked' ? null : 'view';
								this._setDate(date, which);
								break;
							case 'clear':
								var element;
								if (this.isInput)
									element = this.element;
								else if (this.component)
									element = this.element.find('input');
								if (element)
									element.val("").change();
								this.update();
								this._trigger('changeDate');
								if (this.o.autoclose)
									this.hide();
								break;
						}
						break;
					case 'span':
						if (!target.is('.disabled')){
							this.viewDate.setUTCDate(1);
							if (target.is('.month')){
								day = 1;
								month = target.parent().find('span').index(target);
								year = this.viewDate.getUTCFullYear();
								this.viewDate.setUTCMonth(month);
								this._trigger('changeMonth', this.viewDate);
								if (this.o.minViewMode === 1){
									this._setDate(UTCDate(year, month, day));
								}
							}
							else {
								day = 1;
								month = 0;
								year = parseInt(target.text(), 10)||0;
								this.viewDate.setUTCFullYear(year);
								this._trigger('changeYear', this.viewDate);
								if (this.o.minViewMode === 2){
									this._setDate(UTCDate(year, month, day));
								}
							}
							this.showMode(-1);
							this.fill();
						}
						break;
					case 'td':
						if (target.is('.day') && !target.is('.disabled')){
							day = parseInt(target.text(), 10)||1;
							year = this.viewDate.getUTCFullYear();
							month = this.viewDate.getUTCMonth();
							if (target.is('.old')){
								if (month === 0){
									month = 11;
									year -= 1;
								}
								else {
									month -= 1;
								}
							}
							else if (target.is('.new')){
								if (month === 11){
									month = 0;
									year += 1;
								}
								else {
									month += 1;
								}
							}
							this._setDate(UTCDate(year, month, day));
						}
						break;
				}
			}
			if (this.picker.is(':visible') && this._focused_from){
				$(this._focused_from).focus();
			}
			delete this._focused_from;
		},

_toggle_multidate: function(date){
			var ix = this.dates.contains(date);
			if (!date){
				this.dates.clear();
			}
			else if (ix !== -1){
				this.dates.remove(ix);
			}
			else {
				this.dates.push(date);
			}
			if (typeof this.o.multidate === 'number')
				while (this.dates.length > this.o.multidate)
					this.dates.remove(0);
		},

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

this.fill();
			this.setValue();
			this._trigger('changeDate');
			var element;
			if (this.isInput){
				element = this.element;
			}
			else if (this.component){
				element = this.element.find('input');
			}
			if (element){
				element.change();
			}
			if (this.o.autoclose && (!which || which === 'date')){
				this.hide();
			}
		},

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

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

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

keydown: function(e){
			if (this.picker.is(':not(:visible)')){
				if (e.keyCode === 27) // allow escape to hide and re-show picker
					this.show();
				return;
			}
			var dateChanged = false,
				dir, newDate, newViewDate,
				focusDate = this.focusDate || this.viewDate;
			switch (e.keyCode){
				case 27: // escape
					if (this.focusDate){
						this.focusDate = null;
						this.viewDate = this.dates.get(-1) || this.viewDate;
						this.fill();
					}
					else
						this.hide();
					e.preventDefault();
					break;
				case 37: // left
				case 39: // right
					if (!this.o.keyboardNavigation)
						break;
					dir = e.keyCode === 37 ? -1 : 1;
					if (e.ctrlKey){
						newDate = this.moveYear(this.dates.get(-1) || UTCToday(), dir);
						newViewDate = this.moveYear(focusDate, dir);
						this._trigger('changeYear', this.viewDate);
					}
					else if (e.shiftKey){
						newDate = this.moveMonth(this.dates.get(-1) || UTCToday(), dir);
						newViewDate = this.moveMonth(focusDate, dir);
						this._trigger('changeMonth', this.viewDate);
					}
					else {
						newDate = new Date(this.dates.get(-1) || UTCToday());
						newDate.setUTCDate(newDate.getUTCDate() + dir);
						newViewDate = new Date(focusDate);
						newViewDate.setUTCDate(focusDate.getUTCDate() + dir);
					}
					if (this.dateWithinRange(newDate)){
						this.focusDate = this.viewDate = newViewDate;
						this.setValue();
						this.fill();
						e.preventDefault();
					}
					break;
				case 38: // up
				case 40: // down
					if (!this.o.keyboardNavigation)
						break;
					dir = e.keyCode === 38 ? -1 : 1;
					if (e.ctrlKey){
						newDate = this.moveYear(this.dates.get(-1) || UTCToday(), dir);
						newViewDate = this.moveYear(focusDate, dir);
						this._trigger('changeYear', this.viewDate);
					}
					else if (e.shiftKey){
						newDate = this.moveMonth(this.dates.get(-1) || UTCToday(), dir);
						newViewDate = this.moveMonth(focusDate, dir);
						this._trigger('changeMonth', this.viewDate);
					}
					else {
						newDate = new Date(this.dates.get(-1) || UTCToday());
						newDate.setUTCDate(newDate.getUTCDate() + dir * 7);
						newViewDate = new Date(focusDate);
						newViewDate.setUTCDate(focusDate.getUTCDate() + dir * 7);
					}
					if (this.dateWithinRange(newDate)){
						this.focusDate = this.viewDate = newViewDate;
						this.setValue();
						this.fill();
						e.preventDefault();
					}
					break;
				case 32: // spacebar
					// Spacebar is used in manually typing dates in some formats.
					// As such, its behavior should not be hijacked.
					break;
				case 13: // enter
					focusDate = this.focusDate || this.dates.get(-1) || this.viewDate;
					this._toggle_multidate(focusDate);
					dateChanged = true;
					this.focusDate = null;
					this.viewDate = this.dates.get(-1) || this.viewDate;
					this.setValue();
					this.fill();
					if (this.picker.is(':visible')){
						e.preventDefault();
						if (this.o.autoclose)
							this.hide();
					}
					break;
				case 9: // tab
					this.focusDate = null;
					this.viewDate = this.dates.get(-1) || this.viewDate;
					this.fill();
					this.hide();
					break;
			}
			if (dateChanged){
				if (this.dates.length)
					this._trigger('changeDate');
				else
					this._trigger('clearDate');
				var element;
				if (this.isInput){
					element = this.element;
				}
				else if (this.component){
					element = this.element.find('input');
				}
				if (element){
					element.change();
				}
			}
		},

showMode: function(dir){
			if (dir){
				this.viewMode = Math.max(this.o.minViewMode, Math.min(2, this.viewMode + dir));
			}
			this.picker
				.find('>div')
				.hide()
				.filter('.datepicker-'+DPGlobal.modes[this.viewMode].clsName)
					.css('display', 'block');
			this.updateNavArrows();
		}
	};

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

$(this.inputs)
			.datepicker(options)
			.bind('changeDate', $.proxy(this.dateUpdated, this));

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

var dp = $(e.target).data('datepicker'),
				new_date = dp.getUTCDate(),
				i = $.inArray(e.target, this.inputs),
				l = this.inputs.length;
			if (i === -1)
				return;

$.each(this.pickers, function(i, p){
				if (!p.getUTCDate())
					p.setUTCDate(new_date);
			});

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

delete this.updating;
		},
		remove: function(){
			$.map(this.pickers, function(p){ p.remove(); });
			delete this.element.data().datepicker;
		}
	};

$.fn.datepicker.DPGlobal = DPGlobal;

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

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

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

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

}(window.jQuery));

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