Mira este código, insértalo donde quieres que aparezca la hora en tu página:
<SCRIPT language=Javascript1.2>
<!--
// please keep these lines on when you copy the source
// made by: Nicolas -
http://www.javascript-page.com
var tags_before_clock = "<div class=subtitles>"
var tags_after_clock = "</div>"
if(navigator.appName == "Netscape") {
document.write('<div id="clock" style="font-size: 8pt; position:absolute; left:25px; top:87px; width:176px; height:25px; z-index:1;"></div>');
}
if (navigator.appVersion.indexOf("MSIE") != -1){
document.write('<span id="clock" class="subtitles"></span>');
}
function upclock(){
var dte = new Date();
var hrs = dte.getHours();
var min = dte.getMinutes();
var sec = dte.getSeconds();
var col = ":";
var spc = " ";
var apm;
if (12 < hrs) {
apm="PM";
hrs-=12;
}
else {
apm="AM";
}
if (hrs == 0) hrs=12;
if (min<=9) min="0"+min;
if (sec<=9) sec="0"+sec;
if(navigator.appName == "Netscape") {
document.clock.document.write(tags_before_clock
+hrs+col+min+col+sec+spc+apm+tags_after_clock);
document.clock.document.close();
}
if (navigator.appVersion.indexOf("MSIE") != -1){
clock.innerHTML = tags_before_clock+hrs
+col+min+col+sec+spc+apm+tags_after_clock;
}
}
setInterval("upclock()",1000);
//-->
</SCRIPT>