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ページに最終ログイン日時を表示しようとしています。私はそれを行うことができますが、問題はページが更新または再ロードされるたびに、今回は更新/再ロードの時間に変更されることです。ページの更新やそのようなものを変更せずに最初にログインするときに、同じログイン時間を維持したいのですが、ここに私のコードがあります

var days = 730;
  var lastvisit=new Object();
  var firstvisitmsg=" Welcome!";
  lastvisit.subsequentvisitmsg="Last Login: <b>[displaydate]</b>";

  lastvisit.getCookie=function(Name){
  var re=new RegExp(Name+"=[^;]+", "i");
  if (document.cookie.match(re))
  return document.cookie.match(re)[0].split("=")[1];
  return'';
  }

  lastvisit.setCookie=function(name, value, days){
  var expireDate = new Date();

  var expstring=expireDate.setDate(expireDate.getDate()+parseInt(days));
  document.cookie = name+"="+value+"; expires="+expireDate.toGMTString()+"; path=/";
  }

  lastvisit.showmessage = function() {
  var wh = new Date();
  if (lastvisit.getCookie("visitc") == "") {
  lastvisit.setCookie("visitc", wh, days);
  document.write(firstvisitmsg);
  }

  else {
  var lv = lastvisit.getCookie("visitc");
  var lvp = Date.parse(lv);
  var now = new Date();
  now.setTime(lvp);
  var day = new Array("Sun", "Mon", "Tues", "Wed", "Thur", "Fri", "Sat");
  var month = new Array ("Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec");
  var dd = now.getDate();
  var dy = now.getDay();
  dy = day[dy];
  var mn = now.getMonth();
  mn = month[mn];
  yy = now.getFullYear();
  var hh = now.getHours();
  var ampm = "AM";
  if (hh >= 12) {ampm = "PM"}
  if (hh >12){hh = hh - 12};
  if (hh == 0) {hh = 12}
  if (hh < 10) {hh = "0" + hh};
  var mins = now.getMinutes();
  if (mins < 10) {mins = "0"+ mins}
  var secs = now.getSeconds();
  if (secs < 10) {secs = "0" + secs}
  var dispDate = dy + ", " + mn + " " + dd + ", " + yy + " " + hh + ":" + mins + ":" + secs + " " + ampm
  var lastlogin = lastvisit.subsequentvisitmsg.replace("\[displaydate\]", dispDate);
  document.write(lastlogin);
  }

  lastvisit.setCookie("visitc", wh, days);

  }

<div id="lastcontent" style="margin-top:-30px;margin-left:30px;font-size:72%"><script>lastvisit.showmessage();</script></div>
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