D3 Examples - First weekday of the month

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<!DOCTYPE html>
<head>
  <meta charset="utf-8">
  <script src="https://d3js.org/d3.v4.min.js"></script>
  <style>
    body { margin:0;position:fixed;top:0;right:0;bottom:0;left:0; }
  </style>
</head>
​
<body>
  <script>
    
    console.clear()
​
        var todaysDate = d3.timeDay(new Date);
    
    var monthYear = d3.timeFormat("%m %y");  //extract the month and year from the date
    var dateParse = d3.timeParse("%d %m %y") //parse a given string into a date
        var dayAbbr = d3.timeFormat("%a");       //format a date into the day
    
    var firstDay = dayAbbr(dateParse("01 " + monthYear(todaysDate)))
    
    console.log(firstDay)
​
  </script>
</body>
​
    