如何计算下个月的日期？

function getNextMonthDate() {
  var currentDate = new Date();
  var currentMonth = currentDate.getMonth() + 1;
  var nextMonth;
  var nextYear;

  if (currentMonth > 11) {
    nextMonth = 1;
    nextYear = currentDate.getFullYear() + 1;
  } else {
    nextMonth = currentMonth + 1;
    nextYear = currentDate.getFullYear();
  }

  var nextMonthDate = new Date(nextYear, nextMonth - 1, 1);
  var nextMonthDay = nextMonthDate.getDate();

  return nextMonthDay;
}

console.log(getNextMonthDate());

import datetime

def get_next_month_date():
    current_date = datetime.datetime.now()
    next_month_date = current_date + datetime.timedelta(months=1)
    next_month_day = next_month_date.date().day
    return next_month_day

print(get_next_month_date())