[JAVA] getting of Date Difference

<%@ page import="java.text.SimpleDateFormat"%>

<%@ page import="java.util.Date"%>

Date todayShow1 = new Date();

String chkDateShow1 = "";

SimpleDateFormat formatShow1; 

formatShow1 = new SimpleDateFormat("yyyyMMdd");

chkDateShow1 = formatShow1.format(todayShow1);

String date1="20230504";

String date2=chkDateShow1;

String date3="20230915";

DateFormat format = new SimpleDateFormat("yyyyMMdd");

Date d1 = format.parse( date1 );

Date d2 = format.parse( date2 );

Date d3 = format.parse( date3 );

long Sec = (d1.getTime() - d2.getTime()) / 1000; // 

long Min = (d1.getTime() - d2.getTime()) / 60000; // 

long Hour = (d1.getTime() - d2.getTime()) / 3600000; // 

long Days = Sec / (24*60*60); // 

long Sec3 = (d3.getTime() - d2.getTime()) / 1000; // 

long Min3 = (d3.getTime() - d2.getTime()) / 60000; // 

long Hour3 = (d3.getTime() - d2.getTime()) / 3600000; // 

long Days3 = Sec3 / (24*60*60); // 

<script>

$(document).ready(function() {

var dDayOne = '<%=Days%>';

$("#counterOnePc").text(dDayOne);

$("#counterOne").text(dDayOne);

var dDayTwo = '<%=Days3%>';

$("#counterTwoPc").text(dDayTwo);

$("#counterTwo").text(dDayTwo);

 });

</script> 

😀

Thank you!!

고맙습니다!!