What will be the output of the following code?

var month = "March";
var days;
switch (month) {
  case "January":
  case "March":
  case "May":
  case "July":
  case "August":
  case "October":
  case "December":
    days = 31;
    break;
  case "February":
    days = 28;
    break;
  default:
    days = 30;
}
console.log(days);