在moment.js中从周数生成日期

Question

As mentioned in the title, I have a week number and a year value. Is there a way of finding Monday of that week using moment.js? Was trying, but not succeeded

Answer 1

抱歉，我自己找到了解决方案：

var test = moment().day("Monday").week(week number here);

Answer 2

Building off the answers provided here...

exports.getDateFromWeek = function(week, year) {
    return moment().day("Monday").year(year).week(week).toDate();
};

Personally, I wanted the first Sunday... and in which case it's:

exports.getDateFromWeek = function(week, year) {
    return moment().day("Sunday").year(year).week(week).toDate();
};

Answer 3

Try like this:-

var weekdate= function(year, week, dayNumber)
{
    var j1 = new Date( year,0,10,12,0,0),
        j2 = new Date( year,0,4,12,0,0),
        mon1 = j2.getTime() - j1.getDay() * 86400000;
    return new Date(mon1 + ((week- 1)  * 7  + dayNumber) * 86400000);
};
console.log(weekdate(2010, 1, 4));

2010 starts with Thursady

Answer 4

moment('2021').add(16, 'weeks').startOf('week').format('DD MM YYYY');

Starts on Sunday. The above code result is "18 04 2021"

moment('2021').add(16, 'weeks').startOf('isoweek').format('DD MM YYYY');

Starts on Monday. The above code result is "19 04 2021"