Trying to get workweek from date

by Chance Nursey-Bush

JavaScript

console.clear();

function daydiff(first, second) {
  return Math.round((second - first) / (1000 * 60 * 60 * 24));
}

function getWorkweekFromDate(dt2) {
  //var dt2 = new Date("11/17/2014");

  var dt2Year = dt2.getFullYear();
  var dt1 = new Date("1/1/" + dt2Year);
  //console.log("start of year");
  //console.log(dt1);

  var numDaysBetween = daydiff(dt1, dt2);
  //console.log(numDaysBetween);

  var dayOfWeekDt1 = dt1.getDay();
  var dayOfWeekDt2 = dt2.getDay();

  //console.log(dayOfWeekDt1);
  //console.log(dayOfWeekDt2);

  var firstDayOfWW1 = new Date(dt1);
  firstDayOfWW1.setDate(dt1.getDate() - dayOfWeekDt1);

  var firstDayOfCurrent = new Date(dt2);
  firstDayOfCurrent.setDate(dt2.getDate() - dayOfWeekDt2);

  //console.log(firstDayOfWW1);
  //console.log(firstDayOfCurrent);

  var daydiffVal = daydiff(firstDayOfWW1, firstDayOfCurrent);
  //console.log(daydiffVal);

  var workWeek = (daydiffVal / 7) + 1;
  return workWeek;
}

var randomDates = [
	"6/7/2000"
,"8/16/2000"
,"2/16/2002"
,"3/22/2003"
,"6/21/2003"
,"1/25/2004"
,"9/15/2006"
,"10/15/2006"
,"11/24/2006"
,"4/17/2007"
,"7/27/2007"
,"4/20/2009"
,"3/9/2010"
,"11/11/2012"
,"1/2/2013"
,"10/17/2013"
,"4/15/2014"
,"5/23/2016"
,"11/22/2016"
,"6/10/2017"
];

for(var x = 0; x < randomDates.length; ++x){
	console.log("WW" + getWorkweekFromDate(new Date(randomDates[x])) + " - " + randomDates[x]);
}