SOURCE

const endTime = 1680451199000

// 过去6个月每个月1号凌晨时间戳数组
let monthArr = getLastMonth(endTime, 6, "number")
const startMonthTime = monthArr[0]
const endMonthTime = getMonthEnd(monthArr[5]).monthEnd

let monthList = []
monthArr.map(item => {
    monthList.push(getMonthEnd(item))
})

console.log(monthList)

// 获取最近六个月每个月的1号(time - 时间, num - 想要获取的月份, type - string/number)
function getLastMonth(time, num, type) {
    let data = new Date(time);
    //获取年
    let year = data.getFullYear();
    //获取月
    let mon = data.getMonth() + 1;
    let arry = []
    for (let i = 0; i < num; i++) {
        if (mon <= 0) {
            year = year - 1;
            mon = mon + 12;
        }
        if (mon < 10) {
            mon = "0" + mon;
        }
        if (type === "string") {
            arry[i] = year + "-" + mon + "-01 00:00:00";
        } else {
            arry[i] = new Date(year + "-" + mon + "-01 00:00:00").valueOf()
        }
        mon = mon - 1;
    }

    arry = arry.sort((a, b) => a - b)
    return arry;
}


// 获取某个时间的月首和月尾信息
function getMonthEnd(times) {
    let date = new Date(times);
    let new_year = date.getFullYear();    //取当前的年份
    let month = date.getMonth();
    let new_month = month + 1;//取当前的月份
    if (month > 12) {
        new_month -= 12;        //月份减
        new_year++;            //年份增
    }




    let d = new Date(new_year, new_month, 1);//取当年当月中的第一天
    let lastDay = new Date(d.getTime() - 1000 * 60 * 60 * 24).getDate();//获取当月最后一天日期
    let mon = date.getMonth() + 1
    if (mon < 10) {
        mon = "0" + mon
    }
    let start = d.getFullYear() + '-' + mon + '-' + "0" + d.getDate() + ' ' + "00" + ':' + "00" + ':' + "00";
    let end = d.getFullYear() + '-' + mon + '-' + lastDay + ' ' + 23 + ':' + 59 + ':' + 59;

    return {
        monthStart: new Date(start).valueOf(),
        monthStartText: start,
        monthEnd: new Date(end).valueOf(),
        monthEndText: end
    }
}