JS time to get this Monday and Sunday, judge the time is today, before and after today

Record the recent demand for large screen display , Some time processing methods used .

One 、 Get today's pre 3 God , after 3 God

Logic ：
1、 According to today's 24 Time stamp , Add the corresponding time stamp, and the range is the next few days of today .
2、 today 0 Time stamp , Subtract the corresponding timestamp , That is, how many days before today .

    //  Get the day  0  Time stamp of the point 
    let timeStamp = new Date(new Date().setHours(0, 0, 0, 0)) / 1000;
    //  One day is 86400 second     so  3  The timestamp of days ago is 
    let threeDayAgo1 = timeStamp - 86400 * 3;
    //  One day is 86400 second     so  3  The timestamp after days is 
    let fourDayLater1 = timeStamp + 86400 * 4;
    let threeDayAgo = moment(new Date()).add(-3, 'days').format('YYYYMMDD');
    let threeDayLater = moment(new Date()).add(+3, 'days').format('YYYYMMDD');

Two 、 Get this Monday 、 Sunday

   var now = new Date(); // The current date 
   var nowDayOfWeek = now.getDay(); // Today is the third day of the week 
   var nowYear = now.getFullYear(); // The current year 
   var nowMonth = now.getMonth(); // The current month 
   var nowDay = now.getDate(); // Current day 
   
  // Format date ：yyyyMMdd, Here you can do relevant format processing as needed 
  function formatDate(date) {
    var currentYear = date.getFullYear();
    var  currentMonth = date.getMonth()+1;
    var  currentWeekday = date.getDate();
    if(currentMonth < 10){// Less than 10, repair 0
      currentMonth = "0" + currentMonth;
    }
    if(currentWeekday < 10){// Less than 10, repair 0
      currentWeekday = "0" + currentWeekday;
    }
    return (currentYear+''+currentMonth+''+currentWeekday);
  }
  // Get the start date of the week , Add 1
  function getWeekStartDate() {
    var weekStartDate = new Date(nowYear, nowMonth, nowDay-nowDayOfWeek+1);// Because the start date of this week is considered Sunday in the calendar , So add one day to the start date ,
    return formatDate(weekStartDate);
  }

  // Get the end date of the week , Add one 
  function getWeekEndDate() {
    var weekEndDate = new Date(nowYear, nowMonth, nowDay + (6 - nowDayOfWeek)+1);// Because the end date of the week is considered Saturday in the calendar , So add one day to the end date ,
    return formatDate(weekEndDate);
  }

Two 、 The judgment time is today 、 Before 、 after

Logic ：
1、 Judge whether the timestamp is in today's 0 Point to 24 Between points , today ;
2、 In today's 0 Before the point , Before today ;
3、 today 24 After the point , After today .

// The processing time   Is it today 
  const timeTodayJudge = (times) => {
  // Because the value passed in is string "20211130", Do the corresponding character segmentation 
    const year = String(times).substring(0, 4);
    const month = String(times).substring(4, 6);
    const day = String(times).substring(6, 8);
    let time = `${year}-${month}-${day}`;
    let timestamp = Date.parse(time);// The timestamp of the data 
    let todayOStamp = new Date(new Date().toLocaleDateString()).getTime();// same day 0 Time stamp 
    let today24Stamp = new Date(new Date(new Date().toLocaleDateString()).getTime() + 24 * 60 * 60 * 1000 - 1);// same day 24 Time stamp 
    // console.log("===timestamp", timestamp);
    // console.log("===new Date().toDateString()", new Date().toDateString())
    if (timestamp > todayOStamp && timestamp < today24Stamp) {
      return 'today';
    } else if (timestamp < todayOStamp) {// Before today, 
      return 'left';
    } else if (timestamp > today24Stamp) {// After today 
      return 'right';
    }
  }