notes/Get Shift Fire Fighting ENFD-apBtPZZ6.html

<!DOCTYPE html>
<html>
<head>
  <script>
    var date = new Date();
    var shift = getShift(date);

    document.addEventListener("DOMContentLoaded", function(event) { 
      document.getElementById("shift").innerHTML = "Today is a " + shift;
    });

    function getShift(day){
      var oneDay = 24*60*60*1000; // hours*minutes*seconds*milliseconds
      var ashift = new Date(2015,8,15);
      var bshift = new Date(2015,8,16);
      var cshift = new Date(2015,8,17);
      var today = new Date(day);
      today.setHours(0,0,0,0);

      ashift = Math.round(Math.abs((ashift.getTime() - today.getTime())/(oneDay)));
      bshift = Math.round(Math.abs((bshift.getTime() - today.getTime())/(oneDay)));
      cshift = Math.round(Math.abs((cshift.getTime() - today.getTime())/(oneDay)));
      //diffDays % 2;
      if(ashift % 3 === 0){
        return "A shift";
      }else if(bshift % 3 === 0){
        return "B shift";
      }else if(cshift % 3 === 0){
        return "C shift";
      }else{
        return "unkown shift";
      }

    }
  </script>
</head>
<body>
  <h1 id="shift"></h1>
</body>
</html>
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