Date.prototype.format = function(mask) {

	var d = this;

	var zeroize = function (value, length) {

		if (!length) length = 2;

		value = String(value);

		for (var i = 0, zeros = ''; i < (length - value.length); i++) {

			zeros += '0';

		}

		return zeros + value;

	};	

	return mask.replace(/"[^"]*"|'[^']*'|\b(?:d{1,4}|m{1,4}|yy(?:yy)?|([hHMstT])\1?|[lLZ])\b/g, function($0) {

		switch($0) {

			case 'd':	return d.getDate();

			case 'dd':	return zeroize(d.getDate());

			case 'ddd':	return ['Sun','Mon','Tue','Wed','Thr','Fri','Sat'][d.getDay()];

			case 'dddd':	return ['Sunday','Monday','Tuesday','Wednesday','Thursday','Friday','Saturday'][d.getDay()];

			case 'M':	return d.getMonth() + 1;

			case 'MM':	return zeroize(d.getMonth() + 1);

			case 'MMM':	return ['Jan','Feb','Mar','Apr','May','Jun','Jul','Aug','Sep','Oct','Nov','Dec'][d.getMonth()];

			case 'MMMM':	return ['January','February','March','April','May','June','July','August','September','October','November','December'][d.getMonth()];

			case 'yy':	return String(d.getFullYear()).substr(2);

			case 'yyyy':	return d.getFullYear();

			case 'h':	return d.getHours() % 12 || 12;

			case 'hh':	return zeroize(d.getHours() % 12 || 12);

			case 'H':	return d.getHours();

			case 'HH':	return zeroize(d.getHours());

			case 'm':	return d.getMinutes();

			case 'mm':	return zeroize(d.getMinutes());

			case 's':	return d.getSeconds();

			case 'ss':	return zeroize(d.getSeconds());

			case 'l':	return zeroize(d.getMilliseconds(), 3);

			case 'L':	var m = d.getMilliseconds();

					if (m > 99) m = Math.round(m / 10);

					return zeroize(m);

			case 'tt':	return d.getHours() < 12 ? 'am' : 'pm';

			case 'TT':	return d.getHours() < 12 ? 'AM' : 'PM';

			case 'Z':	return d.toUTCString().match(/[A-Z]+$/);

			// Return quoted strings with the surrounding quotes removed

			default:	return $0.substr(1, $0.length - 2);
		}
	});
};


(function($) {

    /*将String类型解析为Date类型.
      #   parseDate('2006-1-1') return new Date(2006,0,1)
      #   parseDate(' 2006-1-1 ') return new Date(2006,0,1)
      #   parseDate('2006-1-1 15:14:16') return new Date(2006,0,1,15,14,16)
      #   parseDate(' 2006-1-1 15:14:16 ') return new Date(2006,0,1,15,14,16);
      #   parseDate('2006-1-1 15:14:16.254') return new Date(2006,0,1,15,14,16,254)
      #   parseDate(' 2006-1-1 15:14:16.254 ') return new Date(2006,0,1,15,14,16,254)
      #   parseDate('不正确的格式') retrun null
      # */
     $.parseDate = function(str) {
         var date = new Date(Date.parse(str.replace(/-/g, "/")));
         return isNaN(date) ? null : date;
     };

     /*
      #   将Date/String类型,解析为String类型.
      #   传入String类型,则先解析为Date类型
      #   不正确的Date,返回 ''
      #   如果时间部分为0,则忽略,只返回日期部分.
      # */
     $.formatDate = function(date,mask) {
         var v;
         if(date.constructor==String){
             v = $.parseDate(date);
         }
         else if(date.constructor==Date){
             v=date;
         }
         else{
             return '';
         }

         if (v instanceof Date) {
         	return v.format(mask);
         }
         else{
         	return '';
         }
     };


    $.isDate = function (str) {
        if (!/\d{4}(\.|\/|\-)\d{1,2}(\.|\/|\-)\d{1,2}/.test(str)) {
            return false;
        }
        var r = str.match(/\d{1,4}/g);
        if (r == null) {
            return false;
        }
        var d = new Date(r[0], r[1] - 1, r[2]);
        return (d.getFullYear() == r[0] && (d.getMonth() + 1) == r[1] && d.getDate() == r[2]);
    };


})(jQuery);