计算日期之间的天数

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

  // 计算日期之间的天数差
  const diffDays = Math.round(Math.abs((startDate - endDate) / oneDay));

  return diffDays;
}

// 示例用法
const startDate = '2022-01-01';
const endDate = '2022-01-10';
const daysBetweenDates = calculateDaysBetweenDates(startDate, endDate);
console.log(daysBetweenDates); // 输出结果为 9