var time_foundation = 701992800;	// vergangene Sekunden (z.B. mit Unix Timestamp umrechnen)
// User-Zeit
var time_current = Math.floor((new Date()).getTime() / 1000);

function updateElapsedTime() {
 time_current++;
 var timeelapsed = time_current - time_foundation;

 // Umrechnen der Sekunden
 var jahre = Math.floor(timeelapsed / 31536000);
 timeelapsed = timeelapsed % 31536000;
 var tage = Math.floor(timeelapsed / 86400);
 timeelapsed = timeelapsed % 86400;
 var stunden = Math.floor(timeelapsed / 3600);
 timeelapsed = timeelapsed % 3600;
 var minuten = Math.floor(timeelapsed / 60);
 timeelapsed = timeelapsed % 60;
 var sekunden = Math.floor(timeelapsed);

 // Übergabe der Anzeige an DIV
 var timediv = document.getElementById('zeitanzeige').firstChild.innerHTML = "SEIT " + jahre + " JAHREN, " + tage + " TAGEN, " + stunden + " STUNDEN UND " + minuten + " MINUTEN";
}

setTimeout("updateElapsedTime()", 1000);