/**  
* 对Date的扩展，将 Date 转化为指定格式的String  
* 月(M)、日(d)、12小时(h)、24小时(H)、分(m)、秒(s)、周(E)、季度(q) 可以用 1-2 个占位符  
* 年(y)可以用 1-4 个占位符，毫秒(S)只能用 1 个占位符(是 1-3 位的数字)  
* eg:  
* (new Date()).pattern("yyyy-MM-dd hh:mm:ss.S") ==> 2006-07-02 08:09:04.423  
* (new Date()).pattern("yyyy-MM-dd E HH:mm:ss") ==> 2009-03-10 二 20:09:04  
* (new Date()).pattern("yyyy-MM-dd EE hh:mm:ss") ==> 2009-03-10 周二 08:09:04  
* (new Date()).pattern("yyyy-MM-dd EEE hh:mm:ss") ==> 2009-03-10 星期二 08:09:04  
* (new Date()).pattern("yyyy-M-d h:m:s.S") ==> 2006-7-2 8:9:4.18  
*/
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;
}


//Get days and other datetime
//diffrence two datetime
// date1 :更早的日期 小的日期
// date2 :后面的日期 大的日期
//  返回两个时间差的天数小时数分数秒数和毫秒数
function DiffLong(datestr1, datestr2) {

    var date1 = new Date(Date.parse(datestr1.replace(/-/g, "/")));
    var date2 = new Date(Date.parse(datestr2.replace(/-/g, "/")));
    var datetimeTemp;
    var isLater = true;
    var fuhao = "";
    if (date1.getTime() > date2.getTime()) {
        isLater = false;
        datetimeTemp = date1;
        date1 = date2;
        date2 = datetimeTemp;
        fuhao = "+";
    }
    else {
        fuhao = "-"; 
    }
    difference = date2.getTime() - date1.getTime();
    thisdays = Math.floor(difference / (1000 * 60 * 60 * 24));

    difference = difference - thisdays * (1000 * 60 * 60 * 24);
    thishours = Math.floor(difference / (1000 * 60 * 60));


    var strRet = thisdays + ',' + thishours;

    return fuhao + "," + strRet;
}

function dateToStr(datetime) {

    var year = datetime.getFullYear();
    var month = datetime.getMonth() + 1; //js从0开始取 
    var date = datetime.getDate();
    var hour = datetime.getHours();
    var minutes = datetime.getMinutes();
    var second = datetime.getSeconds();

    if (month < 10) {
        month = "0" + month;
    }
    if (date < 10) {
        date = "0" + date;
    }
    if (hour < 10) {
        hour = "0" + hour;
    }
    if (minutes < 10) {
        minutes = "0" + minutes;
    }
    if (second < 10) {
        second = "0" + second;
    }

    var time = year + "-" + month + "-" + date + " " + hour + ":" + minutes + ":" + second; //2009-06-12 17:18:05
    // alert(time);
    return time;
}

Date.prototype.addDays = function (d) {
    this.setDate(this.getDate() + d);
};


Date.prototype.addWeeks = function (w) {
    this.addDays(w * 7);
};


Date.prototype.addMonths = function (m) {
    var d = this.getDate();
    this.setMonth(this.getMonth() + m);

    if (this.getDate() < d)
        this.setDate(0);
};


Date.prototype.addYears = function (y) {
    var m = this.getMonth();
    this.setFullYear(this.getFullYear() + y);

    if (m < this.getMonth()) {
        this.setDate(0);
    }
};

function strToDate(str) {
    var arys = new Array();
    arys = str.split('-');
    var newDate = new Date(arys[0], arys[1] - 1, arys[2]);
    return newDate;
}
/***********************************/