计算两个日期之间的天数

function calculateDaysBetweenDates(startDate, endDate) {
  const oneDay = 24 * 60 * 60 * 1000; // 一天的毫秒数

  // 将日期字符串转换为日期对象
  const start = new Date(startDate);
  const end = new Date(endDate);

  // 计算两个日期之间的天数差异
  const diffDays = Math.round(Math.abs((start - end) / oneDay));

  return diffDays;
}

const startDate = '2022-01-01';
const endDate = '2022-01-10';

const daysBetweenDates = calculateDaysBetweenDates(startDate, endDate);
console.log(daysBetweenDates); // 输出结果为 9