Generate date from week number in moment.js

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

score 107 · Accepted Answer · answered Sep 24 '13 at 15:21

107

Sorry found solution myself:

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

answered Sep 24 '13 at 15:21

Bartosz

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How to get the date from a week number for a particular year? Thanks – codingbbq Feb 19 '15 at 12:19
9

You would probably use moment().year(2014).week(weeknum); – mix3d Apr 22 '15 at 18:51
3

To get the beginning of the week use: moment().year(2018).week(25).day('monday').format('MMMM Do YYYY'); – Scott Wright Jun 20 '18 at 17:26

score 20 · Answer 2 · answered Mar 14 '16 at 10:06

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();
};

score 2 · Answer 3 · answered Sep 24 '13 at 15:19

2

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

answered Sep 24 '13 at 15:19

Rahul Tripathi

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The OP asked for a solution using Moment.js. As far as I can tell, this does not answer the question. – cdeszaq Mar 04 '14 at 15:50

score 1 · Answer 4 · answered Apr 21 '21 at 10:52

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"

Generate date from week number in moment.js

4 Answers4