JS日期處理工具類

    <script>

    var now = new Date();                    //當前日期

    var nowDayOfWeek = now.getDay();         //今天本周的第幾天

    var nowDay = now.getDate();              //當前日

    var nowMonth = now.getMonth();           //當前月

    var nowYear = now.getYear();             //當前年

    nowYear += (nowYear < 2000) ? 1900 : 0;  //


//格式化日期：yyyy-MM-dd     
function formatDate(date) {      
    var myyear = date.getFullYear();     
    var mymonth = date.getMonth()+1;     
    var myweekday = date.getDate();      

    if(mymonth < 10){     
        mymonth = "0" + mymonth;     
    }      
    if(myweekday < 10){     
        myweekday = "0" + myweekday;     
    }     
    return (myyear+"-"+mymonth + "-" + myweekday);      
}      

//獲得某月的天數     
function getMonthDays(myMonth){     
    var monthStartDate = new Date(nowYear, myMonth, 1);      
    var monthEndDate = new Date(nowYear, myMonth + 1, 1);      
    var   days   =   (monthEndDate   -   monthStartDate)/(1000   *   60   *   60   *   24);      
    return   days;      
}     

//獲得本季度的開始月份     
function getQuarterStartMonth(){     
    var quarterStartMonth = 0;     
    if(nowMonth<3){     
       quarterStartMonth = 0;     
    }     
    if(2<nowMonth && nowMonth<6){     
       quarterStartMonth = 3;     
    }     
    if(5<nowMonth && nowMonth<9){     
       quarterStartMonth = 6;     
    }     
    if(nowMonth>8){     
       quarterStartMonth = 9;     
    }     
    return quarterStartMonth;     
}     

//獲得本周的開始日期     
function getWeekStartDate() {      
    var weekStartDate = new Date(nowYear, nowMonth, nowDay - nowDayOfWeek);      
    return formatDate(weekStartDate);     
}      

//獲得本周的結束日期     
function getWeekEndDate() {      
    var weekEndDate = new Date(nowYear, nowMonth, nowDay + (6 - nowDayOfWeek));      
    return formatDate(weekEndDate);     
}      

//獲得本月的開始日期     
function getMonthStartDate(){     
    var monthStartDate = new Date(nowYear, nowMonth, 1);      
    return formatDate(monthStartDate);     
}     

//獲得本月的結束日期     
function getMonthEndDate(){     
    var monthEndDate = new Date(nowYear, nowMonth, getMonthDays(nowMonth));      
    return formatDate(monthEndDate);     
}     

//獲得本季度的開始日期     
function getQuarterStartDate(){     

    var quarterStartDate = new Date(nowYear, getQuarterStartMonth(), 1);      
    return formatDate(quarterStartDate);     
}     

//或的本季度的結束日期     
function getQuarterEndDate(){     
    var quarterEndMonth = getQuarterStartMonth() + 2;     
    var quarterStartDate = new Date(nowYear, quarterEndMonth, getMonthDays(quarterEndMonth));      
    return formatDate(quarterStartDate);     
}     

alert(getQuarterEndDate());     
</script>  </pre><br />