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<?xml version="1.0" encoding="utf-8" standalone="no"?>
<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.0//EN"
  "http://www.w3.org/TR/2001/REC-SVG-20010904/DTD/svg10.dtd" [
  <!ATTLIST svg xmlns:xlink CDATA #FIXED "http://www.w3.org/1999/xlink">
]>
<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink"
  onload="yy_datetime()">
  <title>SVG - Learning By Coding</title>
  <desc>SVG-Spezifikation in Beispielen</desc>
  <defs>

    <style type="text/css">
      <![CDATA[
      text
      {
        font-family: monospace;
        font-weight: bold;
      }
      text.t1
      {
        fill: #F00;
        font-size: 24px;
      }
      text.t2
      {
        fill: #090;
        font-size: 36px;
      }
      text.headline
      {
        font-family: sans-serif;
        font-size: 24px;
        font-weight: normal;
        fill: #000;
      }
    ]]>
    </style>
   <script type="text/javascript">
      <![CDATA[
      var svgroot,text1,text2;
      svgroot=document.documentElement;
      text1=svgroot.getElementById("date");
      text2=svgroot.getElementById("time");
      function yy_datetime()
      {
        var datetime,temp,date,time;
        datetime=new Date().toLocaleString();
        temp=datetime.lastIndexOf(" ");
        date=datetime.substring(0,temp);
        time=datetime.substring(temp+1,datetime.length);
        text1.firstChild.data=date;
        text2.firstChild.data=time;
        setTimeout("yy_datetime()",1000);
      }
      ]]>
    </script>
  </defs>
  <text class="headline" x="20" y="30">SVG Digital Clock</text>
  <text id="date" class="t1" x="20" y="80"> </text>
  <text id="time" class="t2" x="20" y="120"> </text>
</svg>

自己解决了。