/*用相对不规则的字符串来创建日期对象,不规则的含义为:顺序包含年月日三个数值串,有间隔*/
String.prototype.createDate = function() {
	var regThree = /^\D*(\d{2,4})\D+(\d{1,2})\D+(\d{1,2})\D*$/;
	var regSix = /^\D*(\d{2,4})\D+(\d{1,2})\D+(\d{1,2})\D+(\d{1,2})\D+(\d{1,2})\D+(\d{1,2})\D*$/;
	var str = " ";
	var date = null;
	if (regThree.test(this)) {
		str = this.replace(/\s/g, " ").replace(regThree, "$1/$2/$3 ");
		date = new Date(str);
	} else if (regSix.test(this)) {
		str = this.match(regSix);
		date = new Date(str[1], str[2] - 1, str[3], str[4], str[5], str[6]);
	}
	if (isNaN(date))
		return new Date();
	else
		return date;
};

/* 
 *   功能:根据输入表达式返回日期字符串 
 *   参数:dateFmt:字符串,由以下结构组成         
 *             yy:长写年,YY:短写年mm:数字月,MM:英文月,dd:日,hh:时, 
 *             mi:分,ss秒,ms:毫秒,we:汉字星期,WE:英文星期. 
 *             isFmtWithZero   :   是否用0进行格式化,true   or   false 
 */
Date.prototype.parseString = function(dateFmt, isFmtWithZero) {
	dateFmt = (dateFmt == null ? "yy-mm-dd " : dateFmt);
	isFmtWithZero = (isFmtWithZero == null ? true : isFmtWithZero);
	if (typeof (dateFmt) != "string")
		throw (new Error(-1, 'parseString()方法需要字符串类型参数! '));
	var weekArr = [ [ "星期日 ", "星期一 ", "星期二 ", "星期三 ", "星期四 ", "星期五 ", "星期六 " ],
			[ "SUN ", "MON ", "TUR ", "WED ", "THU ", "FRI ", "SAT " ] ];
	var monthArr = [ "JAN ", "FEB ", "MAR ", "APR ", "MAY ", "JUN ", "JUL ",
			"AUG ", "SEP ", "OCT ", "NOV ", "DEC " ];
	var str = dateFmt;
	str = str.replace(/yy/g, this.getFullYear());
	str = str.replace(/YY/g, this.getYear());
	str = str.replace(/mm/g, (this.getMonth() + 1).toString().fmtWithZero(
			isFmtWithZero));
	str = str.replace(/MM/g, monthArr[this.getMonth()]);
	str = str.replace(/dd/g, this.getDate().toString().fmtWithZero(
			isFmtWithZero));
	str = str.replace(/hh/g, this.getHours().toString().fmtWithZero(
			isFmtWithZero));
	str = str.replace(/mi/g, this.getMinutes().toString().fmtWithZero(
			isFmtWithZero));
	str = str.replace(/ss/g, this.getSeconds().toString().fmtWithZero(
			isFmtWithZero));
	str = str.replace(/ms/g, this.getMilliseconds().toString().fmtWithZeroD(
			isFmtWithZero));
	str = str.replace(/we/g, weekArr[0][this.getDay()]);
	str = str.replace(/WE/g, weekArr[1][this.getDay()]);
	return str;
};

/*将一位数字格式化成两位,如:   9   to   09*/
String.prototype.fmtWithZero = function(isFmtWithZero) {
	if (isFmtWithZero)
		return (this < 10 ? "0 " + this : this);
	else
		return this;
};

String.prototype.fmtWithZeroD = function(isFmtWithZero) {
	if (isFmtWithZero)
		return (this < 10 ? "00 " + this : (this < 100 ? "0 " + this : this));
	else
		return this;
};

/*   功能   :   返回与某日期相距N天(N个24小时)的日期 
 *   参数   :   num   number类型   可以为正负整数或者浮点数,默认为1; 
 *                 type   0(秒)   or   1(天),默认为秒 
 *   返回   :   新的PowerDate类型 
 */
Date.prototype.dateAfter = function(num, type) {
	num = (num == null ? 1 : num);
	if (typeof (num) != "number ")
		throw new Error(-1, "dateAfterDays(num,type)的num参数为数值类型. ");
	type = (type == null ? 0 : type);
	var arr = [ 1000, 86400000 ];
	var dd = this.valueOf();
	dd += num * arr[type];
	return new Date(dd);
};

//判断是否是闰年,返回true   或者   false 
Date.prototype.isLeapYear = function() {
	var year = this.getFullYear();
	return (0 == year % 4 && ((year % 100 != 0) || (year % 400 == 0)));
};

//返回该月天数 
Date.prototype.getDaysOfMonth = function() {
	return (new Date(this.getFullYear(), this.getMonth() + 1, 0)).getDate();
};

//转换成大写日期(中文) 
Date.prototype.getChinaDate = function() {
	var year = this.getFullYear().toString();
	var month = this.getMonth() + 1;
	var day = this.getDate();
	var arrNum = [ "零 ", "一 ", "二 ", "三 ", "四 ", "五 ", "六 ", "七 ", "八 ", "九 ",
			"十 ", "十一 ", "十二 " ];
	var strTmp = " ";
	for ( var i = 0, j = year.length; i < j; i++) {
		strTmp += arrNum[year.charAt(i)];
	}
	strTmp += "年 ";
	strTmp += arrNum[month] + "月 ";
	if (day < 10)
		strTmp += arrNum[day];
	else if (day < 20)
		strTmp += "十 " + arrNum[day - 10];
	else if (day < 30)
		strTmp += "二十 " + arrNum[day - 20];
	else
		strTmp += "三十 " + arrNum[day - 30];
	strTmp += "日 ";
	return strTmp;
};

//日期比较函数,参数date:为Date类型,如this日期晚于参数:1,相等:0   早于:   -1 
Date.prototype.dateCompare = function(date) {
	if (typeof (date) != "object " || !(/Date/.test(date.constructor)))
		throw new Error(-1, "dateCompare(date)的date参数为Date类型. ");
	var d = this.getTime() - date.getTime();
	return d > 0 ? 1 : (d == 0 ? 0 : -1);
};

/*功能:返回两日期之差 
 *参数:pd       PowerDate对象 
 *         type:   返回类别标识.yy:年,mm:月,ww:周,dd:日,hh:小时,mi:分,ss:秒,ms:毫秒 
 *         intOrFloat   :返回整型还是浮点型值   0:整型,不等于0:浮点型 
 *         output   :   输出提示,如:时间差为#周! 
 */
Date.prototype.calDateDistance = function(date, type, intOrFloat, output) {
	if (typeof (date) != "object" || !(/Date/.test(date.constructor)))
		throw new Error(-1,
				"calDateDistance(date,type,intOrFloat)的date参数为Date类型. ");
	type = (type == null ? 'dd' : type);
	if (!((new RegExp(type + ",", "g")).test("yy,mm,ww,dd,hh,mi,ss,ms, ")))
		throw new Error(-1,
				"calDateDistance(pd,type,intOrFloat,output)的type参数为非法. ");
	var iof = (intOrFloat == null ? 0 : intOrFloat);
	var miSecMain = this.valueOf();
	var miSecSub = date.valueOf();
	var num = 0;
	switch (type) {
	case "yy":
		num = this.getFullYear() - date.getFullYear();
		break;
	case "mm":
		num = (this.getFullYear() - date.getFullYear()) * 12 + this.getMonth()
				- date.getMonth();
		break;
	case "ww":
		num = ((miSecMain - miSecSub) / 7 / 86400000).fmtRtnVal(iof);
		break;
	case "dd":
		num = ((miSecMain - miSecSub) / 86400000).fmtRtnVal(iof);
		break;
	case "hh":
		num = ((miSecMain - miSecSub) / 3600000).fmtRtnVal(iof);
		break;
	case "mi":
		num = ((miSecMain - miSecSub) / 60000).fmtRtnVal(iof);
		break;
	case "ss":
		num = ((miSecMain - miSecSub) / 1000).fmtRtnVal(iof);
		break;
	case "ms":
		num = (miSecMain - miSecSub);
		break;
	default:
		break;
	}
	if (output)
		return output.replace(/#/g,"   " + num + "   ");
	else
		return num;
};

//返回整数或者两位小数的浮点数 
Number.prototype.fmtRtnVal = function(intOrFloat) {
	return (intOrFloat == 0 ? Math.floor(this) : parseInt(this * 100) / 100);
};

Date.prototype.format = function(format) {
	var o = {
		"M+" : this.getMonth() + 1, // month
		"d+" : this.getDate(), // day
		"h+" : this.getHours(), // hour
		"m+" : this.getMinutes(), // minute
		"s+" : this.getSeconds(), // second
		"q+" : Math.floor((this.getMonth() + 3) / 3), // quarter
		"S" : this.getMilliseconds()
	// millisecond
	};
	if (/(y+)/.test(format)) {
		format = format.replace(RegExp.$1, (this.getFullYear() + "")
				.substr(4 - RegExp.$1.length));
	}
	for ( var k in o) {
		if (new RegExp("(" + k + ")").test(format))
			format = format.replace(RegExp.$1, RegExp.$1.length == 1 ? o[k]
					: ("00" + o[k]).substr(("" + o[k]).length));
	}
	return format;
};

//返回本地时间
function getCurrentTime(utcDate) {
	if (utcDate == null || utcDate == "") return utcDate;
	if (typeof (utcDate) != "string")
		throw (new Error(-2, 'getCurrentTime()方法需要字符串类型参数! '));	
	var originalDate = utcDate.createDate();
	var originalTime = originalDate.getTime();
	var now = new Date(originalTime + getOffset() * 3600000);
	
	return now;
}

//返回相对于UTC时间的小时偏移
function getOffset() {
	var d = new Date();
	var tz = d.getTimezoneOffset();
	if (tz == 0) {
		return tz;
	} else {
		return -(d.getTimezoneOffset() / 60);
	}	
}


/*
 * var   date1   =   "2005-11-1   00:00:00 ".createDate(); 
	var   date2   =   "2005-11-3   00:00:00 ".createDate(); 
alert(date2.calDateDistance(date1, "hh ")); 
 * 
 * 
 */