2.3 日期计算(Date.prototype.DateAdd)

//+---------------------------------------------------  
//| 日期计算  
//+---------------------------------------------------  
Date.prototype.DateAdd = function(strInterval, Number) {   
    var dtTmp = this;  
    switch (strInterval) {   
        case 's' :return new Date(Date.parse(dtTmp) + (1000 * Number));  
        case 'n' :return new Date(Date.parse(dtTmp) + (60000 * Number));  
        case 'h' :return new Date(Date.parse(dtTmp) + (3600000 * Number));  
        case 'd' :return new Date(Date.parse(dtTmp) + (86400000 * Number));  
        case 'w' :return new Date(Date.parse(dtTmp) + ((86400000 * 7) * Number));  
        case 'q' :return new Date(dtTmp.getFullYear(), (dtTmp.getMonth()) + Number*3, dtTmp.getDate(), dtTmp.getHours(), dtTmp.getMinutes(), dtTmp.getSeconds());  
        case 'm' :return new Date(dtTmp.getFullYear(), (dtTmp.getMonth()) + Number, dtTmp.getDate(), dtTmp.getHours(), dtTmp.getMinutes(), dtTmp.getSeconds());  
        case 'y' :return new Date((dtTmp.getFullYear() + Number), dtTmp.getMonth(), dtTmp.getDate(), dtTmp.getHours(), dtTmp.getMinutes(), dtTmp.getSeconds());  
    }  
}  

2.4 比较日期差(Date.prototype.DateDiff)

//+---------------------------------------------------  
//| 比较日期差 dtEnd 格式为日期型或者有效日期格式字符串  
//+---------------------------------------------------  
Date.prototype.DateDiff = function(strInterval, dtEnd) {   
    var dtStart = this;  
    if (typeof dtEnd == 'string' )//如果是字符串转换为日期型  
    {   
        dtEnd = StringToDate(dtEnd);  
    }  
    switch (strInterval) {   
        case 's' :return parseInt((dtEnd - dtStart) / 1000);  
        case 'n' :return parseInt((dtEnd - dtStart) / 60000);  
        case 'h' :return parseInt((dtEnd - dtStart) / 3600000);  
        case 'd' :return parseInt((dtEnd - dtStart) / 86400000);  
        case 'w' :return parseInt((dtEnd - dtStart) / (86400000 * 7));  
        case 'm' :return (dtEnd.getMonth()+1)+((dtEnd.getFullYear()-dtStart.getFullYear())*12) - (dtStart.getMonth()+1);  
        case 'y' :return dtEnd.getFullYear() - dtStart.getFullYear();  
    }  
}  

2.5 日期转字符串(Date.prototype.toString)

//+---------------------------------------------------  
//| 日期输出字符串，重载了系统的toString方法  
//+---------------------------------------------------  
Date.prototype.toString = function(showWeek)  
{   
    var myDate= this;  
    var str = myDate.toLocaleDateString();  
    if (showWeek)  
    {   
        var Week = ['日','一','二','三','四','五','六'];  
        str += ' 星期' + Week[myDate.getDay()];  
    }  
    return str;  
}  

2.6 日期分割为数组(Date.prototype.toArray)

//+---------------------------------------------------  
//| 把日期分割成数组  
//+---------------------------------------------------  
Date.prototype.toArray = function()  
{   
    var myDate = this;  
    var myArray = Array();  
    myArray[0] = myDate.getFullYear();  
    myArray[1] = myDate.getMonth();  
    myArray[2] = myDate.getDate();  
    myArray[3] = myDate.getHours();  
    myArray[4] = myDate.getMinutes();  
    myArray[5] = myDate.getSeconds();  
    return myArray;  
}