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Here you can Sed posuere consectetur est at lobortis. Donec ullamcorper nulla non metus auctor fringilla. Maecenas sed diam eget risus varius blandit sit amet non magna. Donec id elit non mi porta gravida at eget metus. Praesent commodo cursus magna, vel scelerisque nisl consectetur et.

            
              function getDaysInMonth(year, month) {
  return new Date(year, month + 1, 0).getDate();
}

function getStartOfMonth(year, month) {
  return new Date(year, month, 1).getDay();
}

function generateMonth(year, month) {
  const startOfMonth = getStartOfMonth(year, month);
  const daysInMonth = getDaysInMonth(year, month);

  const amountOfWeeks = Math.ceil((startOfMonth + daysInMonth) / 7);

  return Array(amountOfWeeks)
          .fill()
          .map((_, week) => {
            return Array(7).fill().map((_, day) => {
              const dayOfTheMonth = ((week * 7) - (startOfMonth - 1)) + day;
              if (dayOfTheMonth < 1 || dayOfTheMonth > daysInMonth) {
                return null;
              }
              return dayOfTheMonth;
            });
          });
}

console.log('Januari 2020')
console.log(generateMonth(2020, 0));
console.log('Februari 2020')
console.log(generateMonth(2020, 1));
console.log('Maart 2020')
console.log(generateMonth(2020, 2));
console.log('April 2020')
console.log(generateMonth(2020, 3));
console.log('Mei 2020')
console.log(generateMonth(2020, 4));
console.log('Juni 2020')
console.log(generateMonth(2020, 5));
console.log('Juli 2020')
console.log(generateMonth(2020, 6));
console.log('Augustus 2020')
console.log(generateMonth(2020, 7));
console.log('September 2020')
console.log(generateMonth(2020, 8));
console.log('Oktober 2020')
console.log(generateMonth(2020, 9));
console.log('November 2020')
console.log(generateMonth(2020, 10));
console.log('December 2020')
console.log(generateMonth(2020, 11));
            
          
!
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