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Moment js get specific day of month by week and day of the week

How do I get the second Tuesday of a given month or get the third Thursday of the month using moment js.

I tried to find a solution but with no success. I wrote it myself and posted the answer below and if you have a better solution you can answer your implementation.

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//get a preferred day of a month
var getGivenDateOfMonth = function (startDate, dayOfWeek, weekNumber) {
            var startOfMonth = moment(startDate).utc().startOf('month').startOf('isoweek');
            var dayOne = moment((moment(startDate, "YYYY-MM-DD").format("YYYY-MM") + "-01"),"YYYY-MM-DD");
            var studyDate;
            if (dayOne.isoWeekday() === 1) {
                studyDate = moment(startDate).utc().startOf('month').startOf('isoweek').add(dayOfWeek - 1, 'days')
                    .add(weekNumber, 'w');
            }
            else if (dayOne.isoWeekday() <= dayOfWeek) {
                studyDate = moment(startDate).utc().startOf('month').startOf('isoweek').add(dayOfWeek - 1, 'days')
                    .add(weekNumber - 1, 'w');
            } else {
                studyDate = moment(startDate).utc().startOf('month').startOf('isoweek').add(dayOfWeek - 1, 'days')
                    .add(weekNumber, 'w');
            }
            if (studyDate.month() == startOfMonth.month()) {
                studyDate = studyDate.subtract(1, 'w');
            }
            return studyDate;
        };


startDate is the date in the given month.
dayOfWeek is the day of the js ISO of the day of the week and
weeknumber is the week number (1,2,3,4) you want

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Here is an updated version of the answer that I linked in the comments. I am using weekday

to use the significant day of the week, you can use day

if you always want Sunday to be 0 and Saturday as 6.



var getGivenDateOfMonth = function (startDate, dayOfWeek, weekNumber) {
  // Start of the month of the given startDate
  var myMonth = moment(startDate).startOf('month');
  // dayOfWeek of the first week of the month
  var firstDayOfWeek = myMonth.clone().weekday(dayOfWeek);
  // Check if first firstDayOfWeek is in the given month
  if( firstDayOfWeek.month() != myMonth.month() ){
      weekNumber++;
  }
  // Return result
  return firstDayOfWeek.add(weekNumber-1, 'weeks');
}

// Examples
var secondMondayOfJuly = getGivenDateOfMonth('2017-07-10', 1, 2);
console.log(secondMondayOfJuly.format());
var thirdFridayOfJuly = getGivenDateOfMonth('2017-07-10', 5, 3);
console.log(thirdFridayOfJuly.format());
      

        
        
        
      

    
<script src="https://cdnjs.cloudflare.com/ajax/libs/moment.js/2.18.1/moment.min.js"></script>
Run code


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function nthDayOfMonth(month, year, day, weekNum){
   var nearestDay = moment(month + " " + year,"M YYYY").day(day);
   var nthDay = nearestDay.add(nearestDay.isSame(moment({month: month}),"month") ? weekNum - 1  : weekNum ,"weeks");
   return nthDay;
}

document.write(nthDayOfMonth(7,2017,3,3).format("L"));
      

        
        
        
      

    
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/moment.js/2.18.1/moment.min.js"></script>
Run code


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