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<t:actionlinkeventlink t:idevent="someLinkupdateTime" async="true">update</t:actionlink>eventlink>
...
<t:zone t:id="timeArea" id="timeArea">
    The current time is ${currentTime}
</t:zone>

@Inject
private Request request;

@InjectComponent
private Zone myZone;
...
void onActionFromSomeLinkonUpdateTimek()
{
    ajaxResponseRenderer.addRender(timeArea);
}