js实现今天、昨天、本周、上周、本月、上月的开始结束日期

这几天做点餐系统的报表统计，需要快捷查看今天，昨天，本周，上周，本月，上月等功能，那么就需要获取日期，转成对应的YYYY-mm-dd格式，下面看看是怎么做的吧：

今天：

//时间戳转日期
function formatMsgTime (timespan) {

    var dateTime = new Date(timespan);

    var year = dateTime.getFullYear();
    var month = dateTime.getMonth() + 1;
    var day = dateTime.getDate();
    var timeSpanStr;
    timeSpanStr = year + '-' + (month < 10 ? ('0' + month) : month) + '-' + (day<10?('0'+day):day);
    return timeSpanStr;
}

//今天的时间戳
var noTime=Date.parse(new Date())-1000

formatMsgTime(noTime)//转成日期格式比如：2020-4-20

昨天：

//昨天的时间戳
var time=Date.parse(new Date())-1000*60*60*24*1

formatMsgTime(time)//转成日期格式比如：2020-4-19

本月、上月：

function getMonth(){
    var now = new Date(); //当前日期
    var nowMonth = now.getMonth(); //当前月
    var nowYear = now.getFullYear(); //当前年
    var lastMonthDate = new Date(); //上月日期
    lastMonthDate.setMonth(lastMonthDate.getMonth() - 1);
    var lastMonth = lastMonthDate.getMonth();

    //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);
    }
    //获得某月的天数
    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;
    }
    //获得本月的开始日期
    function getMonthStartDate() {
        var monthStartDate = new Date(nowYear, nowMonth, 1);
        return formatDate(monthStartDate);
    }
    //获得本月的结束日期
    function getMonthEndDate() {
        var monthStartDate = new Date(nowYear, nowMonth, getMonthDays(nowMonth));
        return formatDate(monthStartDate);
    }
    //获得上月开始时间
    function getLastMonthStartDate() {
        var lastMonthStartDate = new Date(nowYear, lastMonth, 1);
        return formatDate(lastMonthStartDate);
    }
    //获得上月结束时间
    function getLastMonthEndDate() {
        var lastMonthEndDate = new Date(nowYear, lastMonth, getMonthDays(lastMonth));
        return formatDate(lastMonthEndDate);
    }
    return {
        getMonthStartDate:getMonthStartDate,
        getMonthEndDate:getMonthEndDate,
        getLastMonthStartDate:getLastMonthStartDate,
        getLastMonthEndDate:getLastMonthEndDate
    }
}

//本月开始
console.log(getMonth.getMonthStartDate());

//本月结束
console.log(getMonth.getMonthEndDate());

//上月开始
console.log(getMonth.getLastMonthStartDate());

//上月结束
console.log(getMonth.getLastMonthEndDate());

本周、上周：

function getWeek(n) {
    var now = new Date();
    var year = now.getFullYear();
    var month = now.getMonth() + 1;
    var day = now.getDay(); //返回星期几的某一天;
    n = day == 0 ? n + 6 : n + (day - 1)
    now.setDate(now.getDate() - n);
    let date = now.getDate();
    var s = year + "-" + (month < 10 ? ('0' + month) : month) + "-" + (date < 10 ? ('0' + date) : date);
    return s;
}

//上周的开始时间
    console.log(getWeek(7));
    //上周的结束时间
    console.log(getWeek(1));
    //本周的开始时间
    console.log(getWeek(0));
    //本周的结束时间
    console.log(getWeek(-6));
    //下周的开始时间
    console.log(getWeek(-7));
    //下周结束时间
    console.log(getWeek(-13));

好了，常用的日期查询就写到这里希望对大家有帮助！