JavaScript to achieve time range effect

/*Query date range (current time forward) Add By Vivian 2020/12/04 */
//rangeVal: the separator between two dates num: the interval timeType: the time type function funGetRangeDateByLess(rangeVal,num,timeType){
    var returnVal="";
    var otherVal="";
    var otherTime="";
    var curTime = new Date();
    var curTimeVal = curTime.getFullYear() + '-' + PrefixZero((curTime.getMonth() + 1), 2) + '-' + PrefixZero(curTime.getDate(), 2);
    switch (timeType) {
        case 1://var addMinutes = curTime.setMinutes(curTime.getMinutes() - num);
            otherTime=new Date(addMinutes);
            break;
        case 2://var addMinutes = curTime.setHours(curTime.getHours() - num);
            otherTime=new Date(addMinutes);
            break;
        case 3://dayvar addDate = curTime.setDate(curTime.getDate() - num);
            otherTime=new Date(addDate);
            break;
        case 4://monthvar addMonth = curTime.setMonth(curTime.getMonth() - num);
            otherTime=new Date(addMonth);
            break;
        case 5://yearvar addYear = curTime.setFullYear(curTime.getFullYear() - num);
            otherTime=new Date(addYear);
            break;
        default:
            break;
    }
    otherVal = otherTime.getFullYear() + '-' + PrefixZero((otherTime.getMonth() + 1), 2) + '-' + PrefixZero(otherTime.getDate(), 2);
    return returnVal=otherVal+rangeVal+curTimeVal;
}

/*Automatically fill in zeros Add By Vivian 2020/12/04 */
function PrefixZero(num, n) {
    return (Array(n).join(0) + num).slice(-n);
}

var fillhelptime=funGetRangeDateByLess(" , ",6,4);
laydate.render({
        elem: "#fillhelptime",
        range: ",",
        type: 'date',
        value:fillhelptime, //default value });

/*Query the date range (how many days before and after a certain date) Add By Vivian 2021/04/06 */
//rangeVal: the separator between two datesdate: a certain datebeforeDays: the first N daysafterDays: the last N daysfunction funGetRangeDateByBeforeAndAfter(rangeVal,date,beforeDays,afterDays){
    var dateVaule1 = new Date(date);//Convert to time format var dateVaule2 = new Date(date);//Convert to time format var startDate = new Date(dateVaule1.setDate(dateVaule1.getDate() - beforeDays));//First N days var endDate = new Date(dateVaule2.setDate(dateVaule2.getDate() + afterDays));//Later N days var date1 = startDate.getFullYear() + '-' + PrefixZero((startDate.getMonth() + 1), 2) + '-' + PrefixZero(startDate.getDate(), 2);
    var date2 = endDate.getFullYear() + '-' + PrefixZero((endDate.getMonth() + 1), 2) + '-' + PrefixZero(endDate.getDate(), 2);
    var returnVal=date1+rangeVal+date2;
    return returnVal;
}

/*Automatically fill in zeros Add By Vivian 2020/12/04 */
function PrefixZero(num, n) {
    return (Array(n).join(0) + num).slice(-n);
}

/*Query the date range (how much time before and after a certain time point) Add By Vivian 2021/04/06 */
//rangeVal: the separator between two dates timeType: the time type between them date: a certain date beforeDays: the first N days afterDays: the last N days function funGetRangeDateByBeforeAndAfter(rangeVal,timeType,date,beforeNum,afterNum){
    var dateVaule1 = new Date(date);//Convert to time format var dateVaule2 = new Date(date);//Convert to time format var startDate = "";
    var endDate = "";
    switch (timeType) {
        case 1://startDate = new Date(dateVaule1.setMinutes(dateVaule1.getMinutes() - beforeNum));//First N minutesendDate = new Date(dateVaule2.setMinutes(dateVaule2.getMinutes() + afterNum));//After N minutesbreak;
        case 2://startDate = new Date(dateVaule1.setHours(dateVaule1.getHours() - beforeNum));//First N hoursendDate = new Date(dateVaule2.setHours(dateVaule2.getHours() + afterNum));//After N hoursbreak;
        case 3://daysstartDate = new Date(dateVaule1.setDate(dateVaule1.getDate() - beforeNum));//First N daysendDate = new Date(dateVaule2.setDate(dateVaule2.getDate() + afterNum));//After N daysbreak;
        case 4://monthstartDate = new Date(dateVaule1.setMonth(dateVaule1.getMonth() - beforeNum));//first N monthsendDate = new Date(dateVaule2.setMonth(dateVaule2.getMonth() + afterNum));//after N monthsbreak;
        case 5://yearstartDate = new Date(dateVaule1.setFullYear(dateVaule1.getFullYear() - beforeNum));//First N yearsendDate = new Date(dateVaule2.setFullYear(dateVaule2.getFullYear() + afterNum));//After N yearsvar addYear = curTime.setFullYear(curTime.getFullYear() - num);
            break;
        default:
            break;
    }
    var returnVal1 = startDate.getFullYear() + '-' + PrefixZero((startDate.getMonth() + 1), 2) + '-' + PrefixZero(startDate.getDate(), 2);
    var returnVal2 = endDate.getFullYear() + '-' + PrefixZero((endDate.getMonth() + 1), 2) + '-' + PrefixZero(endDate.getDate(), 2);
    var returnVal=returnVal1+rangeVal+returnVal2;
    return returnVal;
}

/*Automatically fill in zeros Add By Vivian 2020/12/04 */
function PrefixZero(num, n) {
    return (Array(n).join(0) + num).slice(-n);
}