/**
 * 获取某年某月天数
 * @param {Date} date 年月 PS: 2022-03
 */
const getMonthDay = (date) => {
  let year = Number(date.slice(0, 4))
  let month = Number(date.slice(5, 7))
  let days = new Date(year, month, 0).getDate()
  return days
}

getMonthDay('2022-03') // 31

getMonthDay('2022-02-17 13:28:01') // 28