(function(){
	var ns = __namespace( "Astro.utils.Date" );

	//// Static utilities
	// Chinese char for 0-9
	var cChar = [ "12295", "19968", "20108", "19977", "22235", "20116", "20845", "19971", "20843", "20061", "21313" ];
	// Capital month
	var CAP_MONTHS = [ false, false, false, true, false, true, false, false, true, false, true, false ];
	var MONTH_ABBR = ["Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"];
	var MONTH = [
		"January"
		, "February"
		, "March"
		, "April"
		, "May"
		, "June"
		, "July"
		, "August"
		, "September"
		, "October"
		, "November"
		, "December"
	];
	var DAY_ABBR = ["Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"];
	var DAY = ["Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday"];

	// get responding chinese char from number
	var cCountDay = function (num)
	{
		str = num.toString();
		if( num != 0 && num % 10 == 0 )
		{
			return ( num == 10 ? "" : String.fromCharCode( cChar[ str[0] ] ) )
				+ String.fromCharCode( cChar[10] );
		}
		else if( num < 10 )
		{
			return String.fromCharCode( cChar[ str[0] ] );
		}
		else if( num < 20 )
		{
			return String.fromCharCode( cChar[10] )
				+ String.fromCharCode( cChar[ str[1] ] );
		}

		return String.fromCharCode( cChar[ str[0] ] )
			+ String.fromCharCode( cChar[10] )
			+ String.fromCharCode( cChar[ str[1] ] );
	};


	// Input yyyy-mm-dd small small
	// output dd mmmm yyyy DDDDD
	var prettyDay = function ( b, sMon, sDay )
	{
		var c = b.split("-");
		var d = new Date( c[0], c[1] - 1, c[2] );

		return d.getDate() + " "
			+ ( sMon ? MONTH_ABBR[ d.getMonth() ] : MONTH[ d.getMonth() ] ) + " "
			+ d.getFullYear() + " "
			+ ( sDay ? DAY_ABBR[ d.getDay() ] : DAY[ d.getDay() ] )
			;
	};

	// Small month stamp: output dd-mmm-yyyy
	var smstamp = function ( dateObj )
	{
		return dateObj.getDate() + "-" + MONTH_ABBR[ dateObj.getMonth() ] + "-" + dateObj.getFullYear();
	};

	// Pretty format XXth MMMM, YYYY
	var pretty = function( dateObj, plain )
	{
		return String( dateObj.getDate() )
			+ ( plain ? "" : "<sup>" )
			+ getOrdinalSuffix( dateObj.getDate() )
			+ ( plain ? " " : "</sup> " )
			+ MONTH[ dateObj.getMonth() ]
			+ ", "
			+ String( dateObj.getFullYear() )
		;
	};

	// returns a timespan
	// Input Array [ yyyy, mm, dd ], [ yyyy, mm, dd ]
	var diff = function( from, to )
	{
		return new Date(
			new Date( to[0], to[1], to[2] ).getTime()
			- new Date( from[0], from[1], from[2] ).getTime()
		);
	};

	// Get a chinese date format
	var chinese = function ( date )
	{
		var str = date.getFullYear().toString();
		var datestmp = "";

		for(i in str)
		{
			datestmp += String.fromCharCode( cChar[ str[i] ] );
		}

		datestmp += String.fromCharCode("24180");

		datestmp += cCountDay(date.getMonth() + 1)
				+ String.fromCharCode("26376")
				+ cCountDay(date.getDate())
				+ String.fromCharCode("26085");

		return datestmp;
	};

	// returns a suffix string
	// st, nd, rd, th
	var getOrdinalSuffix = function(day)
	{
		if (day < 4 || ( 20 < day && day < 24 )) {
			if (day == 1 || day == 21) return "st";
			else if (day == 2 || day == 22) return "nd";
			else if (day == 3 || day == 23) return "rd";
		}
		else if (day == 31) return "st";
		return "th";
	};

	ns[ NS_EXPORT ]( EX_FUNC, "pretty", pretty );
	ns[ NS_EXPORT ]( EX_FUNC, "prettyDay", prettyDay );
	ns[ NS_EXPORT ]( EX_FUNC, "diff", diff );
	ns[ NS_EXPORT ]( EX_FUNC, "smstamp", smstamp );
	ns[ NS_EXPORT ]( EX_FUNC, "chinese", chinese );

	ns[ NS_EXPORT ]( EX_CONST, "CAP_MONTHS", CAP_MONTHS );
	ns[ NS_EXPORT ]( EX_CONST, "MONTH", MONTH );
	ns[ NS_EXPORT ]( EX_CONST, "MONTH_ABBR", MONTH_ABBR );
	ns[ NS_EXPORT ]( EX_CONST, "DAY", DAY );
	ns[ NS_EXPORT ]( EX_CONST, "DAY_ABBR", DAY_ABBR );
})();