如何将日期格式从5-JUN-99转换为050599？

function convertDateFormat(dateString) {
  const monthMap = {
    'JAN': '01',
    'FEB': '02',
    'MAR': '03',
    'APR': '04',
    'MAY': '05',
    'JUN': '06',
    'JUL': '07',
    'AUG': '08',
    'SEP': '09',
    'OCT': '10',
    'NOV': '11',
    'DEC': '12'
  };

  const dateParts = dateString.split('-');
  const day = dateParts[0].padStart(2, '0');
  const month = monthMap[dateParts[1]];
  const year = dateParts[2].padStart(2, '0');

  return `${day}${month}${year}`;
}

const inputDate = '5-JUN-99';
const convertedDate = convertDateFormat(inputDate);
console.log(convertedDate);  // 输出：050599