js获得本季度的开始日期 结束日期

var now = new Date(); //当前日期
var nowMonth = now.getMonth()+1; //当前月
var nowYear = now.getFullYear(); //当前年

//获得日期
getAllDate:function(date,fmt) {
    if(null == fmt || undefined == fmt || "" == fmt)
        fmt = "yyyy/MM/dd";
    var date = new Date(date);
    var o = {
        "M+": date.getMonth() + 1, //月份
        "d+": date.getDate(), //日
        "h+": date.getHours(), //小时
        "m+": date.getMinutes(), //分
        "s+": date.getSeconds(), //秒
        "q+": Math.floor((date.getMonth() + 3) / 3), //季度
        "S": date.getMilliseconds() //毫秒
    };
    if (/(y+)/.test(fmt)) fmt = fmt.replace(RegExp.$1, (date.getFullYear() + "").substr(4 - RegExp.$1.length));
    for (var k in o)
        if (new RegExp("(" + k + ")").test(fmt))
            fmt = fmt.replace(RegExp.$1, (RegExp.$1.length == 1) ? (o[k]) : (("00" + o[k]).substr(("" + o[k]).length)));
    return fmt;
},

//获得本季度的开始月份
 getQuarterStartMonth:function (){
     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;
},
 //获得某月的天数
 getMonthDays:function (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;
},
//获得本月最后一天
getMonthLastDay:function(){
    var lastDay = (new Date(new Date(nowYear,nowMonth,1).getTime()-1000*60*60*24)).getDate();
    return lastDay
},
//获得本季度的开始日期
 getQuarterStartDate:function(){
     var quarterStartDate = new Date(nowYear, crm.getQuarterStartMonth(), 1);
     return crm.getAllDate(quarterStartDate,"yyyy-MM-dd");
 },
 //获得本季度的结束日期
 getQuarterEndDate:function (){
     var quarterEndMonth = crm.getQuarterStartMonth() + 2;
     var quarterStartDate = new Date(nowYear, quarterEndMonth, crm.getMonthDays(quarterEndMonth));
     return crm.getAllDate(quarterStartDate,"yyyy-MM-dd");
 },
//季度数字转汉字
 getQuarterUpChar:function(lowerchar){
    var upchar = "";
    switch (lowerchar) {
        case "1":
            upchar = "一";
            break;
        case "2":
            upchar = "二";
            break;
        case "3":
            upchar = "三";
            break;
        case "4":
            upchar = "四";
            break;
    }
    return upchar;
 }