Спасибо, Сегура!
Я нашла...
Вот работающий скрипт, может кому пригодитя:
<html>
<head>
<title>Скрипт показывает сколько дней осталось до нового года</title>
</head>
<body>
<script language="JavaScript1.2">
//Script courtesy of Sharon Gartenberg's Date Countdown
//JavaScript generator under the GNU General Public License
var today = new Date;
var Future0 = new Date;
ThisYear = 2003;
var FutureMonth = 11;
var FutureDate = 31;
var faraevent = "";
Future0.setMonth(FutureMonth, FutureDate);
Future0.setFullYear(ThisYear);
today1 = Date.parse(today);
future1 = Date.parse(Future0);
secleft = future1 - today1;
miliday = 24 * 60 * 60 * 1000;
daysleft = secleft/miliday;
daysleftint = Math.round(daysleft);
if (daysleftint > 1)
document.write("<font color=#ff0000>До нового года ", daysleftint, " дней", faraevent , "!</font>");
else if (daysleftint == 1)
document.write(faraevent, " is tomorrow! ");
else if (today1 == future1)
document.write(faraevent, " is today! ");
</script>
</body>
</html>