Java-Script

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Sample　　ブラウザ・メニューの【更新】を押してみて下さい。

Netscapeの場合は、年が表示されないと思います。(Version4.73 では、ダメでした。)

ソース

<HTML>
<HEAD>

<SCRIPT LANGUAGE="JavaScript">
<!--
var day_span = 90;
var this_day = new Date(); 
this_day.setTime(this_day.getTime() + (day_span*24*60*60*1000));
function Visitor(info){
  var GuestName = GetCookie('GuestName')
  if (GuestName == null) {
    GuestName = prompt("お名前をどうぞ！");
    SetCookie ('GuestName', GuestName, this_day);
  }
  return GuestName;
}
function LastVisitDayTime(info){
  var rightNow = new Date();
  var LastVisitTime = 0;
  LastVisitTime = GetCookie('LastTime');
  LastVisitTime = LastVisitTime * 1;
  var lastHereFormatting = new Date(LastVisitTime);
  var intLastVisit = (lastHereFormatting.getYear() * 10000)+(lastHereFormatting.getMonth() * 100) +
 lastHereFormatting.getDate()
  var lastHereInDateFormat = "" + lastHereFormatting;
  var Month = conv_jpn(lastHereInDateFormat.substring(4,7));
  var date = lastHereInDateFormat.substring(8,11);
  var tm_of_day = lastHereInDateFormat.substring(11,19);
  var year = lastHereInDateFormat.substring(29,33);
  var WWHText = year +"/"+Month +"/"+date+" "+ tm_of_day;
  SetCookie ("LastTime", rightNow.getTime(), this_day);
  return WWHText;
}
function getCookieVal (offset) {
  var endstr = document.cookie.indexOf (";", offset);
  if (endstr == -1) endstr = document.cookie.length;
  return unescape(document.cookie.substring(offset, endstr));
}
function GetCookie (name) {
  var arg = name + "=";
  var alen = arg.length;
  var clen = document.cookie.length;
  var i = 0;
  while (i < clen) {
    var j = i + alen;
    if (document.cookie.substring(i, j) == arg) return getCookieVal (j);
    i = document.cookie.indexOf(" ", i) + 1;
    if (i == 0) break;
  }
  return null;
}
function SetCookie (name, value) {
  var argv = SetCookie.arguments;
  var argc = SetCookie.arguments.length;
  var expires = (argc > 2) ? argv[2] : null;
  document.cookie = name + "=" + escape (value) + 
  ((expires == null) ? "" : ("; expires=" + expires.toGMTString()));
}
function conv_jpn(_month) {
  switch (_month) {
  case "Jan":
    return "01";
    break;
  case "Feb":
    return "02";
    break;
  case "Mar":
    return "03";
    break;
  case "Apr":
    return "04";
    break;
  case "May":
    return "05";
    break;
  case "Jun":
    return "06";
    break;
  case "Jul":
    return "07";
    break;
  case "Aug":
    return "08";
    break;
  case "Sep":
    return "09";
    break;
  case "Oct":
    return "10";
    break;
  case "Nov":
    return "11";
    break;
  case "Dec":
    return "12";
    break;
  }

}
//-->
</SCRIPT>

<BODY>
<CENTER>

<SCRIPT LANGUAGE="JavaScript">
document.write("ようこそ " + Visitor() + "さん、前回は " + LastVisitDayTime() +" に来られましたね。");
</SCRIPT>

</CENTER>
</BODY>
</HTML>

ワンポイント解説

var day_span = 90; で、９０日間クッキーが有効になるように設定しています。