текущий месяц номер

function getMonthNumber(monthName) {
  if (monthName === 'January') {
    return 1;
  } else if (monthName === 'February') {
    return 2;
  } else if (monthName === 'March') {
    return 3;
  } else if (monthName === 'April') {
    return 4;
  } else if (monthName === 'May') {
    return 5;
  } else if (monthName === 'June') {
    return 6;
  } else if (monthName === 'July') {
    return 7;
  } else if (monthName === 'August') {
    return 8;
  } else if (monthName === 'September') {
    return 9;
  } else if (monthName === 'October') {
    return 10;
  } else if (monthName === 'November') {
    return 11;
  } else if (monthName === 'December') {
    return 12;
  }
}