  <p:dataExporter type="xlsx" target="tb1" fileName="hr_report_ph_date"  />
                </p:commandButton>

                <p:panel id="gpBillPreview" styleClass="noBorder summeryBorder">
                    <p:dataTable id="tb1" value="#{phDateController.phDates}" var="ph">
                        <f:facet name="header">
                            <h:outputLabel value="#{sessionController.loggedUser.institution.name}" /><br></br>
                            <h:outputLabel value="Staff Shift"/><br/>
 