计算两个日期之间的月份天数

function calculateMonthDays(date1, date2) {
  const startDate = new Date(date1);
  const endDate = new Date(date2);

  const startYear = startDate.getFullYear();
  const endYear = endDate.getFullYear();
  const startMonth = startDate.getMonth();
  const endMonth = endDate.getMonth();

  let monthDays = 0;

  if (startYear === endYear) {
    monthDays += endDate.getDate() - startDate.getDate();
  } else {
    // Calculate days for start year
    const startYearDays = new Date(startYear, startMonth + 1, 0).getDate() - startDate.getDate() + 1;
    monthDays += startYearDays;

    // Calculate days for end year
    const endYearDays = endDate.getDate();
    monthDays += endYearDays;

    // Calculate days for full years in between
    for (let year = startYear + 1; year < endYear; year++) {
      monthDays += new Date(year, 12, 0).getDate();
    }
  }

  return monthDays;
}

const date1 = '2022-01-15';
const date2 = '2022-03-10';
const monthDays = calculateMonthDays(date1, date2);
console.log(monthDays); // Output: 53