React 如何使用时间戳计算得到开始和结束时间戳

function getWantTimestamp(props) {
  //当前时间
  const nowDate = parseInt((new Date().getTime() / 1000).toString()); //当前时间
  switch (props) {
    // 当前时间时间戳
    case "nowData": {
      return nowDate;
    }
    // 当前零点得时间戳
    case "nowZero": {
      let nowZero = nowDate - (nowDate % 86400) - 3600 * 8;
      return nowZero;
    }
    // 过去24小时的时间戳
    case "formerlyDay": {
      let formerlyDay = nowDate - 86400;
      return formerlyDay;
    }
    // 昨天的零点的时间戳
    case "yesterdayZero": {
      let yesterdayZero = nowDate - (nowDate % 86400) - 3600 * 8 - 3600 * 24;
      return yesterdayZero;
    }
    // 本周星期一零点的时间戳
    case "thisMondayZero": {
      let nowThisWeek = new Date().getDay(); //获取当前周
      let a = nowDate - (nowThisWeek - 1) * 86400; //得到当前时间到这周
      let thisMondayZero = a - (a % 86400) - 3600 * 8;
      return thisMondayZero;
    }
    // 上周星期一零点的时间戳
    case "lastMondayZero": {
      let nowThisWeek = new Date().getDay(); //获取当前周
      let a = nowDate - (nowThisWeek - 1) * 86400; //得到当前时间到这周
      let thisMondayZero = a - (a % 86400) - 3600 * 8;
      let lastMondayZero = thisMondayZero - 86400 * 7;
      return lastMondayZero;
    }
    // 过去7天的时间戳
    case "formerlySevenDay": {
      let formerlySevenDay = nowDate - 86400 * 7;
      return formerlySevenDay;
    }
    // 本月开始第一天零点的时间戳
    case "thisMonthBeginZero": {
      let MonthDate: any = new Date();
      MonthDate.setDate(1); //set设置时间
      MonthDate.setHours(0);
      MonthDate.setSeconds(0);
      MonthDate.setMinutes(0);
      let thisMonthBeginZero = parseInt((MonthDate / 1000).toString());
      return thisMonthBeginZero;
    }
    // 过去30天的时间戳
    case "formerlyThirtyDays": {
      let formerlyThirtyDays = nowDate - 86400 * 30;
      return formerlyThirtyDays;
    }
    // 上个月的零点的时间戳
    case "lastMonthDayZero": {
      let nowMonthDate: any = new Date();
      let getMonth = nowMonthDate.getMonth() + 1;
      nowMonthDate.setMonth(getMonth - 2);
      nowMonthDate.setDate(1); //set设置时间
      nowMonthDate.setHours(0);
      nowMonthDate.setSeconds(0);
      nowMonthDate.setMinutes(0);
      let lastMonthDayZero = parseInt((nowMonthDate / 1000).toString());
      return lastMonthDayZero;
    }
    // 今年开始第一天零点的时间戳
    case "thisYearDayZero": {
      let yearDate: any = new Date();
      yearDate.setMonth(0);
      yearDate.setDate(1); //set设置时间
      yearDate.setHours(0);
      yearDate.setSeconds(0);
      yearDate.setMinutes(0);
      let thisYearDayZero = parseInt((yearDate / 1000).toString());
      return thisYearDayZero;
    }
    // 过去12个月的时间戳
    case "formerlyTwelveYearZero": {
      let now12Date: any = new Date();
      let getYear12 = now12Date.getFullYear();
      now12Date.setYear(getYear12 - 1);
      let formerlyTwelveYearZero = parseInt((now12Date / 1000).toString());
      return formerlyTwelveYearZero;
    }
    // 去年开始第一天的时间戳
    case "lastYearDayZero": {
      let nowYearDate: any = new Date();
      let getYear = nowYearDate.getFullYear();
      nowYearDate.setYear(getYear - 1);
      nowYearDate.setMonth(0);
      nowYearDate.setDate(1); //set设置时间
      nowYearDate.setHours(0);
      nowYearDate.setSeconds(0);
      nowYearDate.setMinutes(0);
      let lastYearDayZero = parseInt((nowYearDate / 1000).toString());
      return lastYearDayZero;
    }
    default: {
      console.log("时间参数错误");
      return 0;
    }
  }
}

getWantTimestamp("nowData")//nowData是switch的判断的参数

//当前23:59:59秒时间戳
let today = new Date(new Date().toLocaleDateString()).getTime() + 24*60*60*1000-1
//当前时间戳
let nowDate = parseInt((new Date().getTime()).toString());
//当前时间距离23:59:59秒的时间戳差值
console.log((today - nowDate) / 1000));

import React, { useState, useEffect } from 'react';
function CurrentDateTime() {
  const [currentDateTime, setCurrentDateTime] = useState(new Date());
  useEffect(() => {
    const interval = setInterval(() => {
      setCurrentDateTime(new Date());
    }, 1000); // 每秒更新一次
    return () => {
      clearInterval(interval);
    };
  }, []);
  const year = currentDateTime.getFullYear();
  const month = currentDateTime.getMonth() + 1; // 月份从 0 开始，因此需要加 1
  const date = currentDateTime.getDate();
  const hours = currentDateTime.getHours();
  const minutes = currentDateTime.getMinutes();
  const seconds = currentDateTime.getSeconds();
  return (
    <div>
      <p>当前年月日: {year}-{month < 10 ? `0${month}` : month}-{date}</p>
      <p>当前时分秒: {hours}:{minutes < 10 ? `0${minutes}` : minutes}:{seconds < 10 ? `0${seconds}` : seconds}</p>
    </div>
  );
}
export default CurrentDateTime;