Sí esa podría ser una solución, imprimes el valor inicial de time en un objeto Date de Javascript, y ese Date lo vas incrementando.
Por ejemplo:
Código:
<script type="text/javascript">
var startTime = <?php echo time(); ?>;
function updateClock ( )
{
startTime++;
var currentTime = new Date ( );
currentTime.setTime( startTime );
var currentHours = currentTime.getHours ( );
var currentMinutes = currentTime.getMinutes ( );
var currentSeconds = currentTime.getSeconds ( );
// Pad the minutes and seconds with leading zeros, if required
currentMinutes = ( currentMinutes < 10 ? "0" : "" ) + currentMinutes;
currentSeconds = ( currentSeconds < 10 ? "0" : "" ) + currentSeconds;
// Choose either "AM" or "PM" as appropriate
var timeOfDay = ( currentHours < 12 ) ? "AM" : "PM";
// Convert the hours component to 12-hour format if needed
currentHours = ( currentHours > 12 ) ? currentHours - 12 : currentHours;
// Convert an hours component of "0" to "12"
currentHours = ( currentHours == 0 ) ? 12 : currentHours;
// Compose the string for display
var currentTimeString = currentHours + ":" + currentMinutes + ":" + currentSeconds + " " + timeOfDay;
// Update the time display
document.getElementById("clock").firstChild.nodeValue = currentTimeString;
}
window.onload = function() {
updateClock();
setInterval('updateClock()', 1000 );
}
// -->
</script>
<span id="clock"> </span>
Saludos.