tLabel value="#{bill.department.name}" />
                                    </p:column>

                                    <p:column headerText="Billed at" sortable="true" filterBy="#{bill.createdAt}">
                                        <h:outputLabel value="#{bill.createdAt}">
                                            <f:convertDateTime timeZone="Asia/Colombo" pattern="#{sessionController.applicationPreference.longDateTimeFormat}" />
                                        </h:outputLabel>      