JAVASCRIPT

get number of days in a month javascript

function getDaysInMonth(year, month) {
  return new Date(year, month, 0).getDate();
}

get all days of month javascript

function getDayNamesInMonth(month, year) {
  let date = new Date(year, month, 1);
  let days = [];
  while (date.getMonth() === month) {
    days.push(new Date(date).toLocaleDateString('en-US', { weekday: 'short' }));
    date.setDate(date.getDate() + 1);
  }
  return dayNames;
}