Put <h:outputText>
inside <h:commandLink>
.
<h:commandLink action="#{managerBean.searchQuestion}">
<h:outputText value="#{question.creationDate.time}">
<f:convertDateTime type="both" dateStyle="short" />
</h:outputText>
<f:setPropertyActionListener target="#{managerBean.questionID}" value="#{question.ID}" />
</h:commandLink>