JSFiddle - React, Tailwind, and code Playground

by Hans PUFAL

JavaScript

function sundaysInMonth (m, y) {
  var days = new Date ( y, m, 0).getDate ();
  days -= new Date ([m,days,y].join ('/')).getDay ();  
  return days / 7;
}

for (var r = [], i = 12; i--;)
  r.unshift (sundaysInMotnth (i, 2012));
    

      alert( '2012 : ' + r.join (', '));