function DatePicker( oDate ) {
	// check arguments
	if ( arguments.length == 0 ) {
		this._selectedDate = new Date;
		this._none = false;
	}
	else {
		this._selectedDate = oDate || new Date();
		this._none = oDate == null;
	}

	this._matrix = [[],[],[],[],[],[],[]];
	this._showNone = true;
	this._showToday = true;
	this._firstWeekDay = 0;
	this._redWeekDay = 6;

	this._dontChangeNone = false;
	this._hideCalendar = false;
}

DatePicker.months = [
	"Ianuarie", "Februarie", "Martie", "Aprilie",
	"Mai", "Iunie", "Iulie", "August",
	"Septembrie", "Octombrie", "Noiembrie", "Decembrie"];
DatePicker.days = ["l", "m", "m", "j", "v", "s", "d"];


DatePicker.prototype.onchange = function () {};

DatePicker.prototype.create = function ( doc ) {
	if ( doc == null ) doc = document;

	this._document = doc;

	this._el = doc.createElement( "div" );
	this._el.className = "datePicker";

	var div = doc.createElement( "div" );
	div.className = "dateheader";
	this._el.appendChild( div );

	var headerTable = doc.createElement( "table" );
	headerTable.className = "headerTable";
	headerTable.cellSpacing = 0;
	div.appendChild( headerTable );

	var tBody = doc.createElement( "tbody" );
	headerTable.appendChild( tBody );

	var tr = doc.createElement( "tr" );
	tBody.appendChild( tr );

	var td = doc.createElement( "td" );
	this._previousMonth = doc.createElement( "button" );
	this._previousMonth.className = "previousButton";
	this._previousMonth.setAttribute("type", "button");
	td.appendChild( this._previousMonth );
	tr.appendChild( td );

	td = doc.createElement( "td" );
	td.className = "labelContainer";
	tr.appendChild( td );

	this._topLabel = doc.createElement( "a" );
	this._topLabel.className = "topLabel";
	this._topLabel.href = "#";
	this._topLabel.appendChild( doc.createTextNode( String.fromCharCode( 160 ) ) );
	td.appendChild( this._topLabel );

	this._labelPopup = doc.createElement( "div" );
	this._labelPopup.className = "labelPopup";


	td = doc.createElement( "td" );
	this._nextMonth = doc.createElement( "button" );
	this._nextMonth.className = "nextButton";
	this._nextMonth.setAttribute("type", "button");
	td.appendChild( this._nextMonth );
	tr.appendChild( td );


	div = doc.createElement( "div" );
	div.className = "grid";
	this._el.appendChild( div );
	this._table = div;


	div = doc.createElement( "div" );
	div.className = "datefooter";
	this._el.appendChild( div );

	var footerTable = doc.createElement( "table" );
	footerTable.className = "footerTable";
	footerTable.cellSpacing = 0;
	div.appendChild( footerTable );

	tBody = doc.createElement( "tbody" );
	footerTable.appendChild( tBody );

	tr = doc.createElement( "tr" );
	tBody.appendChild( tr );

	td = doc.createElement( "td" );
	this._todayButton = doc.createElement( "button" );
	this._todayButton.className = "todayButton";
	this._todayButton.setAttribute("type", "button");
	this._todayButton.appendChild( doc.createTextNode( "Today" ) );
	td.appendChild( this._todayButton );
	tr.appendChild( td );

	td = doc.createElement( "td" );
	td.className = "filler";
	td.appendChild( doc.createTextNode( String.fromCharCode( 160 ) ) );
	tr.appendChild( td );

	td = doc.createElement( "td" );
	this._noneButton = doc.createElement( "button" );
	this._noneButton.className = "noneButton";
	this._noneButton.setAttribute("type", "button");
	this._noneButton.appendChild( doc.createTextNode( "None" ) );
	td.appendChild( this._noneButton );
	tr.appendChild( td );



	this._createTable( doc );

	this._updateTable();
	this._setTopLabel();

	if ( !this._showNone )
		this._noneButton.style.visibility = "hidden";
	if ( !this._showToday )
		this._todayButton.style.visibility = "hidden";


	this._previousMonth.hideFocus = true;
	this._nextMonth.hideFocus = true;
	this._todayButton.hideFocus = true;
	this._noneButton.hideFocus = true;



	var dp = this;

	this._previousMonth.onclick = function () {
		dp._hideCalendar = false;
		dp._dontChangeNone = true;
		dp.goToPreviousMonth();
		dp._dontChangeNone = false;
	};
	this._nextMonth.onclick = function () {
		this._hideCalendar = false;
		dp._dontChangeNone = true;
		dp.goToNextMonth();
		dp._dontChangeNone = false;
	};
	this._todayButton.onclick = function () {
		dp.goToToday();
	};
	this._noneButton.onclick = function () {
		dp.setDate( null );
	};

	this._el.onselectstart = function () {
		return false;
	};

	this._table.onclick = function ( e ) {

		if ( e == null ) e = doc.parentWindow.event;


		var el = e.target != null ? e.target : e.srcElement;
		while ( el.nodeType != 1 )
			el = el.parentNode;
		while ( el != null && el.tagName && el.tagName.toLowerCase() != "td" )
			el = el.parentNode;


		if ( el == null || el.tagName == null || el.tagName.toLowerCase() != "td" )
			return;

		var d = new Date( dp._selectedDate );
		var n = Number( el.firstChild.data );
		if ( isNaN( n ) || n <= 0 || n == null )
			return;
		
		dp._hideCalendar = true;
		d.setDate( n );
		dp.setDate( d );
	};


	this._topLabel.onclick = function ( e ) {
		dp._hideCalendar = false;
		dp._showLabelPopup();
		return false;
	};

	this._el.onkeydown = function ( e ) {
		if ( e == null ) e = doc.parentWindow.event;
		var kc = e.keyCode != null ? e.keyCode : e.charCode;

		if ( kc < 37 || kc > 40 ) return true;

		var d = new Date( dp._selectedDate ).valueOf();
		if ( kc == 37 ) // left
			d -= 24 * 60 * 60 * 1000;
		else if ( kc == 39 ) // right
			d += 24 * 60 * 60 * 1000;
		else if ( kc == 38 ) // up
			d -= 7 * 24 * 60 * 60 * 1000;
		else if ( kc == 40 ) // down
			d += 7 * 24 * 60 * 60 * 1000;
		dp._hideCalendar = true;
		dp.setDate( new Date( d ) );
		return false;
	}


	this._el.onmousewheel = function ( e ) {
		if ( e == null ) e = doc.parentWindow.event;
		var n = - e.wheelDelta / 120;
		var d = new Date( dp._selectedDate );
		var m = d.getMonth() + n;
		d.setMonth( m );


		dp._dontChangeNone = true;
		dp.setDate( d );
		dp._dontChangeNone = false;

		return false;
	}

	return this._el;
};

DatePicker.prototype.setDate = function ( oDate ) {

	this._hideLabelPopup();


	if ( oDate == null ) {
		if ( !this._none ) {
			this._none = true;
			this._setTopLabel();
			this._updateTable();

			if ( typeof this.onchange == "function" )
				this.onchange();
		}
		return;
	}


	if ( typeof oDate == "string" || typeof oDate == "number" ) {
		oDate = new Date( oDate );
	}



	if ( this._selectedDate.getDate() != oDate.getDate() ||
		this._selectedDate.getMonth() != oDate.getMonth() ||
		this._selectedDate.getFullYear() != oDate.getFullYear() ||
		this._none ) {

		if ( !this._dontChangeNone )
			this._none = false;

		this._selectedDate = new Date( oDate );

		this._setTopLabel();
		this._updateTable();

		
	}
	if ( typeof this.onchange == "function" && this._hideCalendar == true ){
		
		this.onchange();
	}
	if ( !this._dontChangeNone )
		this._none = false;
}


DatePicker.prototype.getDate = function () {
	if ( this._none ) return null;
	return new Date( this._selectedDate );
}


DatePicker.prototype._createTable = function ( doc ) {
	var str, i;
	var rows = 6;
	var cols = 7;
	var currentWeek = 0;

	var table = doc.createElement( "table" );
	table.className = "gridTable";
	table.cellSpacing = 0;

	var tBody = doc.createElement( "tbody" );
	table.appendChild( tBody );


	var tr = doc.createElement( "tr" );
	tr.className = "daysRow";

	var td, tn;
	var nbsp = String.fromCharCode( 160 );
	for ( i = 0; i < cols; i++ ) {
		td = doc.createElement( "td" );
		td.appendChild( doc.createTextNode( nbsp ) );
		tr.appendChild( td );
	}
	tBody.appendChild( tr );


	tr = doc.createElement( "tr" );
	td = doc.createElement( "td" );
	td.className = "upperLine";
	td.colSpan = 7;
	tr.appendChild( td );
	tBody.appendChild( tr );


	for ( i = 0; i < rows; i++ ) {
		tr = doc.createElement( "tr" );
		for ( var j = 0; j < cols; j++ ) {
			td = doc.createElement( "td" );
			td.appendChild( doc.createTextNode( nbsp ) );
			tr.appendChild( td );
		}
		tBody.appendChild( tr );
	}
	str += "</table>";

	if ( this._table != null )
		this._table.appendChild( table )
};


DatePicker.prototype._updateTable = function () {

	if ( this._table == null ) return;

	var i;
	var str = "";
	var rows = 6;
	var cols = 7;
	var currentWeek = 0;

	var cells = new Array( rows );
	this._matrix = new Array( rows )
	for ( i = 0; i < rows; i++ ) {
		cells[i] = new Array( cols );
		this._matrix[i] = new Array( cols );
	}


	var tmpDate = new Date( this._selectedDate.getFullYear(),
							this._selectedDate.getMonth(), 1 );
	var today = new Date();

	for ( i = 1; i < 32; i++ ) {
		tmpDate.setDate( i );

		var weekDay = ( tmpDate.getDay() + 6 ) % 7;
		var colIndex = ( weekDay - this._firstWeekDay + 7 ) % 7;
		if ( tmpDate.getMonth() == this._selectedDate.getMonth() ) {

			var isToday = tmpDate.getDate() == today.getDate() &&
						tmpDate.getMonth() == today.getMonth() &&
						tmpDate.getFullYear() == today.getFullYear();

			cells[currentWeek][colIndex] = { text: "", className: "" };

			if ( this._selectedDate.getDate() == tmpDate.getDate() && !this._none )
				cells[currentWeek][colIndex].className += "selected ";
			if ( isToday )
				cells[currentWeek][colIndex].className += "today ";
			if ( ( tmpDate.getDay() + 6 ) % 7 == this._redWeekDay ) // ISO
				cells[currentWeek][colIndex].className += "red";

			cells[currentWeek][colIndex].text =
				this._matrix[currentWeek][colIndex] = tmpDate.getDate();

			if ( colIndex == 6 )
				currentWeek++;
		}
	}

	var weekDays = DatePicker.days;
	if (this._firstWeekDay != 0) {
		weekDays = new Array(7);
		for ( i = 0; i < 7; i++)
			weekDays[i] = DatePicker.days[ (i + this._firstWeekDay) % 7];
	}

	var tds = this._table.firstChild.tBodies[0].rows[0].cells;
	for ( i = 0; i < cols; i++ )
		tds[i].firstChild.data = weekDays[i];

	var trs = this._table.firstChild.tBodies[0].rows;
	var tmpCell;
	var nbsp = String.fromCharCode( 160 );
	for ( var y = 0; y < rows; y++ ) {
		for (var x = 0; x < cols; x++) {
			tmpCell = trs[y + 2].cells[x];
			if ( typeof cells[y][x] != "undefined" ) {
				tmpCell.className = cells[y][x].className;
				tmpCell.firstChild.data = cells[y][x].text;
			}
			else {
				tmpCell.className = "";
				tmpCell.firstChild.data = nbsp;
			}
		}
	}
}

DatePicker.prototype._setTopLabel = function () {
	var str = this._selectedDate.getFullYear() + " " + DatePicker.months[ this._selectedDate.getMonth() ];
	if ( this._topLabel != null )
		this._topLabel.lastChild.data = str;
}

DatePicker.prototype.goToNextMonth = function () {
	var d = new Date( this._selectedDate );
	d.setDate( Math.min(d.getDate(), DatePicker.getDaysPerMonth(d.getMonth() + 1,
		d.getFullYear())) );
	d.setMonth( d.getMonth() + 1 );
	this.setDate( d );
}

DatePicker.prototype.goToPreviousMonth = function () {
	var d = new Date( this._selectedDate );
	d.setDate( Math.min(d.getDate(), DatePicker.getDaysPerMonth(d.getMonth() - 1,
		d.getFullYear())) );
	d.setMonth( d.getMonth() - 1 );
	this.setDate( d );
}

DatePicker.prototype.goToToday = function () {
	if ( this._none )
		this._selectedDate = new Date( this._selectedDate + 10000000000 );
	this._none = false;
	this.setDate( new Date() );
}

DatePicker.prototype.setShowToday = function ( bShowToday ) {
	if ( typeof bShowToday == "string" )
		bShowToday = !/false|0|no/i.test( bShowToday );

	if ( this._todayButton != null )
		this._todayButton.style.visibility = bShowToday ? "visible" : "hidden";
	this._showToday = bShowToday;
}

DatePicker.prototype.getShowToday = function () {
	return this._showToday;
}

DatePicker.prototype.setShowNone = function ( bShowNone ) {
	if ( typeof bShowNone == "string" )
		bShowNone = !/false|0|no/i.test( bShowNone );

	if ( this._noneButton != null )
		this._noneButton.style.visibility = bShowNone ? "visible" : "hidden";
	this._showNone = bShowNone;
}

DatePicker.prototype.getShowNone = function () {
	return this._showNone;
}


DatePicker.prototype.setFirstWeekDay = function ( nFirstWeekDay ) {
	if ( this._firstWeekDay != nFirstWeekDay ) {
		this._firstWeekDay = nFirstWeekDay;
		this._updateTable();
	}
}

DatePicker.prototype.getFirstWeekDay = function () {
	return this._firstWeekDay;
}


DatePicker.prototype.setRedWeekDay = function ( nRedWeekDay ) {
	if ( this._redWeekDay != nRedWeekDay ) {
		this._redWeekDay = nRedWeekDay;
		this._updateTable();
	}
}

DatePicker.prototype.getRedWeekDay = function () {
	return this._redWeekDay;
}


DatePicker.prototype._showLabelPopup = function () {


	var dateContext = function ( dp, d ) {
		return function ( e ) {
			dp._dontChangeNone = true;
			dp._hideLabelPopup();
			dp.setDate( d );
			dp._dontChangeNone = false;
			return false;
		};
	};

	var dp = this;

	while ( this._labelPopup.hasChildNodes() )
		this._labelPopup.removeChild( this._labelPopup.firstChild );

	var a, tmp, tmp2;
	for ( var i = -3; i < 4; i++ ) {
		tmp = new Date( this._selectedDate );
		tmp2 = new Date( this._selectedDate );	
		tmp2.setDate(1);
		tmp2.setMonth( tmp2.getMonth() + i );
		tmp.setDate( Math.min(tmp.getDate(), DatePicker.getDaysPerMonth(tmp.getMonth() + i,
			tmp2.getFullYear())) );
		tmp.setMonth( tmp.getMonth() + i );

		a = this._document.createElement( "a" );
		a.href = "javascript:void 0;";
		a.onclick = dateContext( dp, tmp );
		a.appendChild( this._document.createTextNode( tmp.getFullYear() + " " +
									DatePicker.months[ tmp.getMonth() ] ) );
		if ( i == 0 )
			a.className = "selected";
		this._labelPopup.appendChild( a );
	}

	this._topLabel.parentNode.insertBefore( this._labelPopup, this._topLabel.parentNode.firstChild );
};

DatePicker.prototype._hideLabelPopup = function () {
	if ( this._labelPopup.parentNode )
		this._labelPopup.parentNode.removeChild( this._labelPopup );
};

DatePicker._daysPerMonth = [31,28,31,30,31,30,31,31,30,31,30,31];
DatePicker.getDaysPerMonth = function (nMonth, nYear) {
	nMonth = (nMonth + 12) % 12;
	var res = DatePicker._daysPerMonth[nMonth];
	if (nMonth == 1) {
		res += nYear % 4 == 0 && !(nYear % 400 == 0) ? 1 : 0;
	}
	return res;
};

function getFullISODateString(d)
{
 var year = d.getFullYear();
 var month = leadingZero(d.getMonth()+1);
 var day = leadingZero(d.getDate());

 var date = year+"-"+month+"-"+day;
 return date;
}

function leadingZero(x){
 return (x>9)?x:'0'+x;
}