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/* http://keith-wood.name/countdown.html

   Countdown for jQuery v1.6.3.

   Written by Keith Wood (kbwood{at}iinet.com.au) January 2008.

   Available under the MIT (https://github.com/jquery/jquery/blob/master/MIT-LICENSE.txt) license.

   Please attribute the author if you use it. */

/* Display a countdown timer.

   Attach it with options like:

   $('div selector').countdown(

       {until: new Date(2009, 1 - 1, 1, 0, 0, 0), onExpiry: happyNewYear}); */

(function($) { // Hide scope, no $ conflict

/* Countdown manager. */

function Countdown() {

	this.regional = []; // Available regional settings, indexed by language code

	this.regional[''] = { // Default regional settings

		// The display texts for the counters

		labels: ['Years', 'Months', 'Weeks', 'Days', 'Hours', 'Minutes', 'Seconds'],

		// The display texts for the counters if only one

		labels1: ['Year', 'Month', 'Week', 'Day', 'Hour', 'Minute', 'Second'],

		compactLabels: ['y', 'm', 'w', 'd'], // The compact texts for the counters

		whichLabels: null, // Function to determine which labels to use

		digits: ['0', '1', '2', '3', '4', '5', '6', '7', '8', '9'], // The digits to display

		timeSeparator: ':', // Separator for time periods

		isRTL: false // True for right-to-left languages, false for left-to-right

	};

	this._defaults = {

		until: null, // new Date(year, mth - 1, day, hr, min, sec) - date/time to count down to

			// or numeric for seconds offset, or string for unit offset(s):

			// 'Y' years, 'O' months, 'W' weeks, 'D' days, 'H' hours, 'M' minutes, 'S' seconds

		since: null, // new Date(year, mth - 1, day, hr, min, sec) - date/time to count up from

			// or numeric for seconds offset, or string for unit offset(s):

			// 'Y' years, 'O' months, 'W' weeks, 'D' days, 'H' hours, 'M' minutes, 'S' seconds

		timezone: null, // The timezone (hours or minutes from GMT) for the target times,

			// or null for client local

		serverSync: null, // A function to retrieve the current server time for synchronisation

		format: 'dHMS', // Format for display - upper case for always, lower case only if non-zero,

			// 'Y' years, 'O' months, 'W' weeks, 'D' days, 'H' hours, 'M' minutes, 'S' seconds

		layout: '', // Build your own layout for the countdown

		compact: false, // True to display in a compact format, false for an expanded one

		significant: 0, // The number of periods with values to show, zero for all

		description: '', // The description displayed for the countdown

		expiryUrl: '', // A URL to load upon expiry, replacing the current page

		expiryText: '', // Text to display upon expiry, replacing the countdown

		alwaysExpire: false, // True to trigger onExpiry even if never counted down

		onExpiry: null, // Callback when the countdown expires -

			// receives no parameters and 'this' is the containing division

		onTick: null, // Callback when the countdown is updated -

			// receives int[7] being the breakdown by period (based on format)

			// and 'this' is the containing division

		tickInterval: 1 // Interval (seconds) between onTick callbacks

	};

	$.extend(this._defaults, this.regional['']);

	this._serverSyncs = [];

	var now = (typeof Date.now == 'function' ? Date.now :

		function() { return new Date().getTime(); });

	var perfAvail = (window.performance && typeof window.performance.now == 'function');

	// Shared timer for all countdowns

	function timerCallBack(timestamp) {

		var drawStart = (timestamp < 1e12 ? // New HTML5 high resolution timer

			(perfAvail ? (performance.now() + performance.timing.navigationStart) : now()) :

			// Integer milliseconds since unix epoch

			timestamp || now());

		if (drawStart - animationStartTime >= 1000) {

			plugin._updateTargets();

			animationStartTime = drawStart;

		}

		requestAnimationFrame(timerCallBack);

	}

	var requestAnimationFrame = window.requestAnimationFrame ||

		window.webkitRequestAnimationFrame || window.mozRequestAnimationFrame ||

		window.oRequestAnimationFrame || window.msRequestAnimationFrame || null;

		// This is when we expect a fall-back to setInterval as it's much more fluid

	var animationStartTime = 0;

	if (!requestAnimationFrame || $.noRequestAnimationFrame) {

		$.noRequestAnimationFrame = null;

		setInterval(function() { plugin._updateTargets(); }, 980); // Fall back to good old setInterval

	}

	else {

		animationStartTime = window.animationStartTime ||

			window.webkitAnimationStartTime || window.mozAnimationStartTime ||

			window.oAnimationStartTime || window.msAnimationStartTime || now();

		requestAnimationFrame(timerCallBack);

	}

}

var Y = 0; // Years

var O = 1; // Months

var W = 2; // Weeks

var D = 3; // Days

var H = 4; // Hours

var M = 5; // Minutes

var S = 6; // Seconds

$.extend(Countdown.prototype, {

	/* Class name added to elements to indicate already configured with countdown. */

	markerClassName: 'hasCountdown',

	/* Name of the data property for instance settings. */

	propertyName: 'countdown',

	/* Class name for the right-to-left marker. */

	_rtlClass: 'countdown_rtl',

	/* Class name for the countdown section marker. */

	_sectionClass: 'countdown_section',

	/* Class name for the period amount marker. */

	_amountClass: 'countdown_amount',

	/* Class name for the countdown row marker. */

	_rowClass: 'countdown_row',

	/* Class name for the holding countdown marker. */

	_holdingClass: 'countdown_holding',

	/* Class name for the showing countdown marker. */

	_showClass: 'countdown_show',

	/* Class name for the description marker. */

	_descrClass: 'countdown_descr',

	/* List of currently active countdown targets. */

	_timerTargets: [],

	/* Override the default settings for all instances of the countdown widget.

	   @param  options  (object) the new settings to use as defaults */

	setDefaults: function(options) {

		this._resetExtraLabels(this._defaults, options);

		$.extend(this._defaults, options || {});

	},

	/* Convert a date/time to UTC.

	   @param  tz     (number) the hour or minute offset from GMT, e.g. +9, -360

	   @param  year   (Date) the date/time in that timezone or

	                  (number) the year in that timezone

	   @param  month  (number, optional) the month (0 - 11) (omit if year is a Date)

	   @param  day    (number, optional) the day (omit if year is a Date)

	   @param  hours  (number, optional) the hour (omit if year is a Date)

	   @param  mins   (number, optional) the minute (omit if year is a Date)

	   @param  secs   (number, optional) the second (omit if year is a Date)

	   @param  ms     (number, optional) the millisecond (omit if year is a Date)

	   @return  (Date) the equivalent UTC date/time */

	UTCDate: function(tz, year, month, day, hours, mins, secs, ms) {

		if (typeof year == 'object' && year.constructor == Date) {

			ms = year.getMilliseconds();

			secs = year.getSeconds();

			mins = year.getMinutes();

			hours = year.getHours();

			day = year.getDate();

			month = year.getMonth();

			year = year.getFullYear();

		}

		var d = new Date();

		d.setUTCFullYear(year);

		d.setUTCDate(1);

		d.setUTCMonth(month || 0);

		d.setUTCDate(day || 1);

		d.setUTCHours(hours || 0);

		d.setUTCMinutes((mins || 0) - (Math.abs(tz) < 30 ? tz * 60 : tz));

		d.setUTCSeconds(secs || 0);

		d.setUTCMilliseconds(ms || 0);

		return d;

	},

	/* Convert a set of periods into seconds.

	   Averaged for months and years.

	   @param  periods  (number[7]) the periods per year/month/week/day/hour/minute/second

	   @return  (number) the corresponding number of seconds */

	periodsToSeconds: function(periods) {

		return periods[0] * 31557600 + periods[1] * 2629800 + periods[2] * 604800 +

			periods[3] * 86400 + periods[4] * 3600 + periods[5] * 60 + periods[6];

	},

	/* Attach the countdown widget to a div.

	   @param  target   (element) the containing division

	   @param  options  (object) the initial settings for the countdown */

	_attachPlugin: function(target, options) {

		target = $(target);

		if (target.hasClass(this.markerClassName)) {

			return;

		}

		var inst = {options: $.extend({}, this._defaults), _periods: [0, 0, 0, 0, 0, 0, 0]};

		target.addClass(this.markerClassName).data(this.propertyName, inst);

		this._optionPlugin(target, options);

	},

	/* Add a target to the list of active ones.

	   @param  target  (element) the countdown target */

	_addTarget: function(target) {

		if (!this._hasTarget(target)) {

			this._timerTargets.push(target);

		}

	},

	/* See if a target is in the list of active ones.

	   @param  target  (element) the countdown target

	   @return  (boolean) true if present, false if not */

	_hasTarget: function(target) {

		return ($.inArray(target, this._timerTargets) > -1);

	},

	/* Remove a target from the list of active ones.

	   @param  target  (element) the countdown target */

	_removeTarget: function(target) {

		this._timerTargets = $.map(this._timerTargets,

			function(value) { return (value == target ? null : value); }); // delete entry

	},

	/* Update each active timer target. */

	_updateTargets: function() {

		for (var i = this._timerTargets.length - 1; i >= 0; i--) {

			this._updateCountdown(this._timerTargets[i]);

		}

	},

	/* Reconfigure the settings for a countdown div.

	   @param  target   (element) the control to affect

	   @param  options  (object) the new options for this instance or

	                    (string) an individual property name

	   @param  value    (any) the individual property value (omit if options

	                    is an object or to retrieve the value of a setting)

	   @return  (any) if retrieving a value */

	_optionPlugin: function(target, options, value) {

		target = $(target);

		var inst = target.data(this.propertyName);

		if (!options || (typeof options == 'string' && value == null)) { // Get option

			var name = options;

			options = (inst || {}).options;

			return (options && name ? options[name] : options);

		}

		if (!target.hasClass(this.markerClassName)) {

			return;

		}

		options = options || {};

		if (typeof options == 'string') {

			var name = options;

			options = {};

			options[name] = value;

		}

		if (options.layout) {

			options.layout = options.layout.replace(/&lt;/g, '<').replace(/&gt;/g, '>');

		}

		this._resetExtraLabels(inst.options, options);

		var timezoneChanged = (inst.options.timezone != options.timezone);

		$.extend(inst.options, options);

		this._adjustSettings(target, inst,

			options.until != null || options.since != null || timezoneChanged);

		var now = new Date();

		if ((inst._since && inst._since < now) || (inst._until && inst._until > now)) {

			this._addTarget(target[0]);

		}

		this._updateCountdown(target, inst);

	},

	/* Redisplay the countdown with an updated display.

	   @param  target  (jQuery) the containing division

	   @param  inst    (object) the current settings for this instance */

	_updateCountdown: function(target, inst) {

		var $target = $(target);

		inst = inst || $target.data(this.propertyName);

		if (!inst) {

			return;

		}

		$target.html(this._generateHTML(inst)).toggleClass(this._rtlClass, inst.options.isRTL);

		if ($.isFunction(inst.options.onTick)) {

			var periods = inst._hold != 'lap' ? inst._periods :

				this._calculatePeriods(inst, inst._show, inst.options.significant, new Date());

			if (inst.options.tickInterval == 1 ||

					this.periodsToSeconds(periods) % inst.options.tickInterval == 0) {

				inst.options.onTick.apply(target, [periods]);

			}

		}

		var expired = inst._hold != 'pause' &&

			(inst._since ? inst._now.getTime() < inst._since.getTime() :

			inst._now.getTime() >= inst._until.getTime());

		if (expired && !inst._expiring) {

			inst._expiring = true;

			if (this._hasTarget(target) || inst.options.alwaysExpire) {

				this._removeTarget(target);

				if ($.isFunction(inst.options.onExpiry)) {

					inst.options.onExpiry.apply(target, []);

				}

				if (inst.options.expiryText) {

					var layout = inst.options.layout;

					inst.options.layout = inst.options.expiryText;

					this._updateCountdown(target, inst);

					inst.options.layout = layout;

				}

				if (inst.options.expiryUrl) {

					window.location = inst.options.expiryUrl;

				}

			}

			inst._expiring = false;

		}

		else if (inst._hold == 'pause') {

			this._removeTarget(target);

		}

		$target.data(this.propertyName, inst);

	},

	/* Reset any extra labelsn and compactLabelsn entries if changing labels.

	   @param  base     (object) the options to be updated

	   @param  options  (object) the new option values */

	_resetExtraLabels: function(base, options) {

		var changingLabels = false;

		for (var n in options) {

			if (n != 'whichLabels' && n.match(/[Ll]abels/)) {

				changingLabels = true;

				break;

			}

		}

		if (changingLabels) {

			for (var n in base) { // Remove custom numbered labels

				if (n.match(/[Ll]abels[02-9]|compactLabels1/)) {

					base[n] = null;

				}

			}

		}

	},

	/* Calculate interal settings for an instance.

	   @param  target  (element) the containing division

	   @param  inst    (object) the current settings for this instance

	   @param  recalc  (boolean) true if until or since are set */

	_adjustSettings: function(target, inst, recalc) {

		var now;

		var serverOffset = 0;

		var serverEntry = null;

		for (var i = 0; i < this._serverSyncs.length; i++) {

			if (this._serverSyncs[i][0] == inst.options.serverSync) {

				serverEntry = this._serverSyncs[i][1];

				break;

			}

		}

		if (serverEntry != null) {

			serverOffset = (inst.options.serverSync ? serverEntry : 0);

			now = new Date();

		}

		else {

			var serverResult = ($.isFunction(inst.options.serverSync) ?

				inst.options.serverSync.apply(target, []) : null);

			now = new Date();

			serverOffset = (serverResult ? now.getTime() - serverResult.getTime() : 0);

			this._serverSyncs.push([inst.options.serverSync, serverOffset]);

		}

		var timezone = inst.options.timezone;

		timezone = (timezone == null ? -now.getTimezoneOffset() : timezone);

		if (recalc || (!recalc && inst._until == null && inst._since == null)) {

			inst._since = inst.options.since;

			if (inst._since != null) {

				inst._since = this.UTCDate(timezone, this._determineTime(inst._since, null));

				if (inst._since && serverOffset) {

					inst._since.setMilliseconds(inst._since.getMilliseconds() + serverOffset);

				}

			}

			inst._until = this.UTCDate(timezone, this._determineTime(inst.options.until, now));

			if (serverOffset) {

				inst._until.setMilliseconds(inst._until.getMilliseconds() + serverOffset);

			}

		}

		inst._show = this._determineShow(inst);

	},

	/* Remove the countdown widget from a div.

	   @param  target  (element) the containing division */

	_destroyPlugin: function(target) {

		target = $(target);

		if (!target.hasClass(this.markerClassName)) {

			return;

		}

		this._removeTarget(target[0]);

		target.removeClass(this.markerClassName).empty().removeData(this.propertyName);

	},

	/* Pause a countdown widget at the current time.

	   Stop it running but remember and display the current time.

	   @param  target  (element) the containing division */

	_pausePlugin: function(target) {

		this._hold(target, 'pause');

	},

	/* Pause a countdown widget at the current time.

	   Stop the display but keep the countdown running.

	   @param  target  (element) the containing division */

	_lapPlugin: function(target) {

		this._hold(target, 'lap');

	},

	/* Resume a paused countdown widget.

	   @param  target  (element) the containing division */

	_resumePlugin: function(target) {

		this._hold(target, null);

	},

	/* Pause or resume a countdown widget.

	   @param  target  (element) the containing division

	   @param  hold    (string) the new hold setting */

	_hold: function(target, hold) {

		var inst = $.data(target, this.propertyName);

		if (inst) {

			if (inst._hold == 'pause' && !hold) {

				inst._periods = inst._savePeriods;

				var sign = (inst._since ? '-' : '+');

				inst[inst._since ? '_since' : '_until'] =

					this._determineTime(sign + inst._periods[0] + 'y' +

						sign + inst._periods[1] + 'o' + sign + inst._periods[2] + 'w' +

						sign + inst._periods[3] + 'd' + sign + inst._periods[4] + 'h' +

						sign + inst._periods[5] + 'm' + sign + inst._periods[6] + 's');

				this._addTarget(target);

			}

			inst._hold = hold;

			inst._savePeriods = (hold == 'pause' ? inst._periods : null);

			$.data(target, this.propertyName, inst);

			this._updateCountdown(target, inst);

		}

	},

	/* Return the current time periods.

	   @param  target  (element) the containing division

	   @return  (number[7]) the current periods for the countdown */

	_getTimesPlugin: function(target) {

		var inst = $.data(target, this.propertyName);

		return (!inst ? null : (inst._hold == 'pause' ? inst._savePeriods : (!inst._hold ? inst._periods :

			this._calculatePeriods(inst, inst._show, inst.options.significant, new Date()))));

	},

	/* A time may be specified as an exact value or a relative one.

	   @param  setting      (string or number or Date) - the date/time value

	                        as a relative or absolute value

	   @param  defaultTime  (Date) the date/time to use if no other is supplied

	   @return  (Date) the corresponding date/time */

	_determineTime: function(setting, defaultTime) {

		var offsetNumeric = function(offset) { // e.g. +300, -2

			var time = new Date();

			time.setTime(time.getTime() + offset * 1000);

			return time;

		};

		var offsetString = function(offset) { // e.g. '+2d', '-4w', '+3h +30m'

			offset = offset.toLowerCase();

			var time = new Date();

			var year = time.getFullYear();

			var month = time.getMonth();

			var day = time.getDate();

			var hour = time.getHours();

			var minute = time.getMinutes();

			var second = time.getSeconds();

			var pattern = /([+-]?[0-9]+)\s*(s|m|h|d|w|o|y)?/g;

			var matches = pattern.exec(offset);

			while (matches) {

				switch (matches[2] || 's') {

					case 's': second += parseInt(matches[1], 10); break;

					case 'm': minute += parseInt(matches[1], 10); break;

					case 'h': hour += parseInt(matches[1], 10); break;

					case 'd': day += parseInt(matches[1], 10); break;

					case 'w': day += parseInt(matches[1], 10) * 7; break;

					case 'o':

						month += parseInt(matches[1], 10);

						day = Math.min(day, plugin._getDaysInMonth(year, month));

						break;

					case 'y':

						year += parseInt(matches[1], 10);

						day = Math.min(day, plugin._getDaysInMonth(year, month));

						break;

				}

				matches = pattern.exec(offset);

			}

			return new Date(year, month, day, hour, minute, second, 0);

		};

		var time = (setting == null ? defaultTime :

			(typeof setting == 'string' ? offsetString(setting) :

			(typeof setting == 'number' ? offsetNumeric(setting) : setting)));

		if (time) time.setMilliseconds(0);

		return time;

	},

	/* Determine the number of days in a month.

	   @param  year   (number) the year

	   @param  month  (number) the month

	   @return  (number) the days in that month */

	_getDaysInMonth: function(year, month) {

		return 32 - new Date(year, month, 32).getDate();

	},

	/* Determine which set of labels should be used for an amount.

	   @param  num  (number) the amount to be displayed

	   @return  (number) the set of labels to be used for this amount */

	_normalLabels: function(num) {

		return num;

	},

	/* Generate the HTML to display the countdown widget.

	   @param  inst  (object) the current settings for this instance

	   @return  (string) the new HTML for the countdown display */

	_generateHTML: function(inst) {

		var self = this;

		// Determine what to show

		inst._periods = (inst._hold ? inst._periods :

			this._calculatePeriods(inst, inst._show, inst.options.significant, new Date()));

		// Show all 'asNeeded' after first non-zero value

		var shownNonZero = false;

		var showCount = 0;

		var sigCount = inst.options.significant;

		var show = $.extend({}, inst._show);

		for (var period = Y; period <= S; period++) {

			shownNonZero |= (inst._show[period] == '?' && inst._periods[period] > 0);

			show[period] = (inst._show[period] == '?' && !shownNonZero ? null : inst._show[period]);

			showCount += (show[period] ? 1 : 0);

			sigCount -= (inst._periods[period] > 0 ? 1 : 0);

		}

		var showSignificant = [false, false, false, false, false, false, false];

		for (var period = S; period >= Y; period--) { // Determine significant periods

			if (inst._show[period]) {

				if (inst._periods[period]) {

					showSignificant[period] = true;

				}

				else {

					showSignificant[period] = sigCount > 0;

					sigCount--;

				}

			}

		}

		var labels = (inst.options.compact ? inst.options.compactLabels : inst.options.labels);

		var whichLabels = inst.options.whichLabels || this._normalLabels;

		var showCompact = function(period) {

			var labelsNum = inst.options['compactLabels' + whichLabels(inst._periods[period])];

			return (show[period] ? self._translateDigits(inst, inst._periods[period]) +

				(labelsNum ? labelsNum[period] : labels[period]) + ' ' : '');

		};

		var showFull = function(period) {

			var labelsNum = inst.options['labels' + whichLabels(inst._periods[period])];

			return ((!inst.options.significant && show[period]) ||

				(inst.options.significant && showSignificant[period]) ?

				'<span class="' + plugin._sectionClass + '">' +

				'<span class="' + plugin._amountClass + '">' +

				self._translateDigits(inst, inst._periods[period]) + '</span><br/>' +

				(labelsNum ? labelsNum[period] : labels[period]) + '</span>' : '');

		};

		return (inst.options.layout ? this._buildLayout(inst, show, inst.options.layout,

			inst.options.compact, inst.options.significant, showSignificant) :

			((inst.options.compact ? // Compact version

			'<span class="' + this._rowClass + ' ' + this._amountClass +

			(inst._hold ? ' ' + this._holdingClass : '') + '">' +

			showCompact(Y) + showCompact(O) + showCompact(W) + showCompact(D) +

			(show[H] ? this._minDigits(inst, inst._periods[H], 2) : '') +

			(show[M] ? (show[H] ? inst.options.timeSeparator : '') +

			this._minDigits(inst, inst._periods[M], 2) : '') +

			(show[S] ? (show[H] || show[M] ? inst.options.timeSeparator : '') +

			this._minDigits(inst, inst._periods[S], 2) : '') :

			// Full version

			'<span class="' + this._rowClass + ' ' + this._showClass + (inst.options.significant || showCount) +

			(inst._hold ? ' ' + this._holdingClass : '') + '">' +

			showFull(Y) + showFull(O) + showFull(W) + showFull(D) +

			showFull(H) + showFull(M) + showFull(S)) + '</span>' +

			(inst.options.description ? '<span class="' + this._rowClass + ' ' + this._descrClass + '">' +

			inst.options.description + '</span>' : '')));

	},

	/* Construct a custom layout.

	   @param  inst             (object) the current settings for this instance

	   @param  show             (string[7]) flags indicating which periods are requested

	   @param  layout           (string) the customised layout

	   @param  compact          (boolean) true if using compact labels

	   @param  significant      (number) the number of periods with values to show, zero for all

	   @param  showSignificant  (boolean[7]) other periods to show for significance

	   @return  (string) the custom HTML */

	_buildLayout: function(inst, show, layout, compact, significant, showSignificant) {

		var labels = inst.options[compact ? 'compactLabels' : 'labels'];

		var whichLabels = inst.options.whichLabels || this._normalLabels;

		var labelFor = function(index) {

			return (inst.options[(compact ? 'compactLabels' : 'labels') +

				whichLabels(inst._periods[index])] || labels)[index];

		};

		var digit = function(value, position) {

			return inst.options.digits[Math.floor(value / position) % 10];

		};

		var subs = {desc: inst.options.description, sep: inst.options.timeSeparator,

			yl: labelFor(Y), yn: this._minDigits(inst, inst._periods[Y], 1),

			ynn: this._minDigits(inst, inst._periods[Y], 2),

			ynnn: this._minDigits(inst, inst._periods[Y], 3), y1: digit(inst._periods[Y], 1),

			y10: digit(inst._periods[Y], 10), y100: digit(inst._periods[Y], 100),

			y1000: digit(inst._periods[Y], 1000),

			ol: labelFor(O), on: this._minDigits(inst, inst._periods[O], 1),

			onn: this._minDigits(inst, inst._periods[O], 2),

			onnn: this._minDigits(inst, inst._periods[O], 3), o1: digit(inst._periods[O], 1),

			o10: digit(inst._periods[O], 10), o100: digit(inst._periods[O], 100),

			o1000: digit(inst._periods[O], 1000),

			wl: labelFor(W), wn: this._minDigits(inst, inst._periods[W], 1),

			wnn: this._minDigits(inst, inst._periods[W], 2),

			wnnn: this._minDigits(inst, inst._periods[W], 3), w1: digit(inst._periods[W], 1),

			w10: digit(inst._periods[W], 10), w100: digit(inst._periods[W], 100),

			w1000: digit(inst._periods[W], 1000),

			dl: labelFor(D), dn: this._minDigits(inst, inst._periods[D], 1),

			dnn: this._minDigits(inst, inst._periods[D], 2),

			dnnn: this._minDigits(inst, inst._periods[D], 3), d1: digit(inst._periods[D], 1),

			d10: digit(inst._periods[D], 10), d100: digit(inst._periods[D], 100),

			d1000: digit(inst._periods[D], 1000),

			hl: labelFor(H), hn: this._minDigits(inst, inst._periods[H], 1),

			hnn: this._minDigits(inst, inst._periods[H], 2),

			hnnn: this._minDigits(inst, inst._periods[H], 3), h1: digit(inst._periods[H], 1),

			h10: digit(inst._periods[H], 10), h100: digit(inst._periods[H], 100),

			h1000: digit(inst._periods[H], 1000),

			ml: labelFor(M), mn: this._minDigits(inst, inst._periods[M], 1),

			mnn: this._minDigits(inst, inst._periods[M], 2),

			mnnn: this._minDigits(inst, inst._periods[M], 3), m1: digit(inst._periods[M], 1),

			m10: digit(inst._periods[M], 10), m100: digit(inst._periods[M], 100),

			m1000: digit(inst._periods[M], 1000),

			sl: labelFor(S), sn: this._minDigits(inst, inst._periods[S], 1),

			snn: this._minDigits(inst, inst._periods[S], 2),

			snnn: this._minDigits(inst, inst._periods[S], 3), s1: digit(inst._periods[S], 1),

			s10: digit(inst._periods[S], 10), s100: digit(inst._periods[S], 100),

			s1000: digit(inst._periods[S], 1000)};

		var html = layout;

		// Replace period containers: {p<}...{p>}

		for (var i = Y; i <= S; i++) {

			var period = 'yowdhms'.charAt(i);

			var re = new RegExp('\\{' + period + '<\\}([\\s\\S]*)\\{' + period + '>\\}', 'g');

			html = html.replace(re, ((!significant && show[i]) ||

				(significant && showSignificant[i]) ? '$1' : ''));

		}

		// Replace period values: {pn}

		$.each(subs, function(n, v) {

			var re = new RegExp('\\{' + n + '\\}', 'g');

			html = html.replace(re, v);

		});

		return html;

	},

	/* Ensure a numeric value has at least n digits for display.

	   @param  inst   (object) the current settings for this instance

	   @param  value  (number) the value to display

	   @param  len    (number) the minimum length

	   @return  (string) the display text */

	_minDigits: function(inst, value, len) {

		value = '' + value;

		if (value.length >= len) {

			return this._translateDigits(inst, value);

		}

		value = '0000000000' + value;

		return this._translateDigits(inst, value.substr(value.length - len));

	},

	/* Translate digits into other representations.

	   @param  inst   (object) the current settings for this instance

	   @param  value  (string) the text to translate

	   @return  (string) the translated text */

	_translateDigits: function(inst, value) {

		return ('' + value).replace(/[0-9]/g, function(digit) {

				return inst.options.digits[digit];

			});

	},

	/* Translate the format into flags for each period.

	   @param  inst  (object) the current settings for this instance

	   @return  (string[7]) flags indicating which periods are requested (?) or

	            required (!) by year, month, week, day, hour, minute, second */

	_determineShow: function(inst) {

		var format = inst.options.format;

		var show = [];

		show[Y] = (format.match('y') ? '?' : (format.match('Y') ? '!' : null));

		show[O] = (format.match('o') ? '?' : (format.match('O') ? '!' : null));

		show[W] = (format.match('w') ? '?' : (format.match('W') ? '!' : null));

		show[D] = (format.match('d') ? '?' : (format.match('D') ? '!' : null));

		show[H] = (format.match('h') ? '?' : (format.match('H') ? '!' : null));

		show[M] = (format.match('m') ? '?' : (format.match('M') ? '!' : null));

		show[S] = (format.match('s') ? '?' : (format.match('S') ? '!' : null));

		return show;

	},

	/* Calculate the requested periods between now and the target time.

	   @param  inst         (object) the current settings for this instance

	   @param  show         (string[7]) flags indicating which periods are requested/required

	   @param  significant  (number) the number of periods with values to show, zero for all

	   @param  now          (Date) the current date and time

	   @return  (number[7]) the current time periods (always positive)

	            by year, month, week, day, hour, minute, second */

	_calculatePeriods: function(inst, show, significant, now) {

		// Find endpoints

		inst._now = now;

		inst._now.setMilliseconds(0);

		var until = new Date(inst._now.getTime());

		if (inst._since) {

			if (now.getTime() < inst._since.getTime()) {

				inst._now = now = until;

			}

			else {

				now = inst._since;

			}

		}

		else {

			until.setTime(inst._until.getTime());

			if (now.getTime() > inst._until.getTime()) {

				inst._now = now = until;

			}

		}

		// Calculate differences by period

		var periods = [0, 0, 0, 0, 0, 0, 0];

		if (show[Y] || show[O]) {

			// Treat end of months as the same

			var lastNow = plugin._getDaysInMonth(now.getFullYear(), now.getMonth());

			var lastUntil = plugin._getDaysInMonth(until.getFullYear(), until.getMonth());

			var sameDay = (until.getDate() == now.getDate() ||

				(until.getDate() >= Math.min(lastNow, lastUntil) &&

				now.getDate() >= Math.min(lastNow, lastUntil)));

			var getSecs = function(date) {

				return (date.getHours() * 60 + date.getMinutes()) * 60 + date.getSeconds();

			};

			var months = Math.max(0,

				(until.getFullYear() - now.getFullYear()) * 12 + until.getMonth() - now.getMonth() +

				((until.getDate() < now.getDate() && !sameDay) ||

				(sameDay && getSecs(until) < getSecs(now)) ? -1 : 0));

			periods[Y] = (show[Y] ? Math.floor(months / 12) : 0);

			periods[O] = (show[O] ? months - periods[Y] * 12 : 0);

			// Adjust for months difference and end of month if necessary

			now = new Date(now.getTime());

			var wasLastDay = (now.getDate() == lastNow);

			var lastDay = plugin._getDaysInMonth(now.getFullYear() + periods[Y],

				now.getMonth() + periods[O]);

			if (now.getDate() > lastDay) {

				now.setDate(lastDay);

			}

			now.setFullYear(now.getFullYear() + periods[Y]);

			now.setMonth(now.getMonth() + periods[O]);

			if (wasLastDay) {

				now.setDate(lastDay);

			}

		}

		var diff = Math.floor((until.getTime() - now.getTime()) / 1000);

		var extractPeriod = function(period, numSecs) {

			periods[period] = (show[period] ? Math.floor(diff / numSecs) : 0);

			diff -= periods[period] * numSecs;

		};

		extractPeriod(W, 604800);

		extractPeriod(D, 86400);

		extractPeriod(H, 3600);

		extractPeriod(M, 60);

		extractPeriod(S, 1);

		if (diff > 0 && !inst._since) { // Round up if left overs

			var multiplier = [1, 12, 4.3482, 7, 24, 60, 60];

			var lastShown = S;

			var max = 1;

			for (var period = S; period >= Y; period--) {

				if (show[period]) {

					if (periods[lastShown] >= max) {

						periods[lastShown] = 0;

						diff = 1;

					}

					if (diff > 0) {

						periods[period]++;

						diff = 0;

						lastShown = period;

						max = 1;

					}

				}

				max *= multiplier[period];

			}

		}

		if (significant) { // Zero out insignificant periods

			for (var period = Y; period <= S; period++) {

				if (significant && periods[period]) {

					significant--;

				}

				else if (!significant) {

					periods[period] = 0;

				}

			}

		}

		return periods;

	}

});

// The list of commands that return values and don't permit chaining

var getters = ['getTimes'];

/* Determine whether a command is a getter and doesn't permit chaining.

   @param  command    (string, optional) the command to run

   @param  otherArgs  ([], optional) any other arguments for the command

   @return  true if the command is a getter, false if not */

function isNotChained(command, otherArgs) {

	if (command == 'option' && (otherArgs.length == 0 ||

			(otherArgs.length == 1 && typeof otherArgs[0] == 'string'))) {

		return true;

	}

	return $.inArray(command, getters) > -1;

}

/* Process the countdown functionality for a jQuery selection.

   @param  options  (object) the new settings to use for these instances (optional) or

                    (string) the command to run (optional)

   @return  (jQuery) for chaining further calls or

            (any) getter value */

$.fn.countdown = function(options) {

	var otherArgs = Array.prototype.slice.call(arguments, 1);

	if (isNotChained(options, otherArgs)) {

		return plugin['_' + options + 'Plugin'].

			apply(plugin, [this[0]].concat(otherArgs));

	}

	return this.each(function() {

		if (typeof options == 'string') {

			if (!plugin['_' + options + 'Plugin']) {

				throw 'Unknown command: ' + options;

			}

			plugin['_' + options + 'Plugin'].

				apply(plugin, [this].concat(otherArgs));

		}

		else {

			plugin._attachPlugin(this, options || {});

		}

	});

};

/* Initialise the countdown functionality. */

var plugin = $.countdown = new Countdown(); // Singleton instance

})(jQuery);