Problem with JSF TimeZone

This is my method in managerBean

public void carregarDadosVenda(){
    vendaCadastro.setHorario(new Date());
}

This is my page;

    <p:panelGrid columns="2">
        <h:outputText id="txtVendaValorTotal"
            value="Valor Total: #{carrinhoComprasBean.vendaCadastro.valor} " />
        <p:commandButton value="Finalizar Venda"
            action="#{carrinhoComprasBean.carregarDadosVenda}"
            oncomplete="PF('wvDlgFinVenda').show();" />
    </p:panelGrid>
</h:form>

<p:dialog closable="true" draggable="true" modal="true"
    resizable="false" header="Dados da Venda" widgetVar="wvDlgFinVenda"
    appendTo="@(body)">
    <h:form>
        <p:panelGrid columns="2">
            <h:outputText value="Horário " />
            <h:outputText value="#{carrinhoComprasBean.vendaCadastro.horario}">
                <f:convertDateTime pattern="dd/MM/yyyy"/>                   
            </h:outputText>
            <h:outputText value="Nome da Noticia " />
            <h:outputText  />
            <h:outputText value="Valor Toral " />
            <h:outputText />
        </p:panelGrid>
        <p:panelGrid columns="2">
            <p:commandButton value="Salvar: " />
            <p:commandButton value="Voltar: "
                onclick="PF('wvDlgFinVenda').hide();" />
        </p:panelGrid>

    </h:form>

And I put this in the web.xml file

<context-param>
    <param-name>javax.faces.DATETIMECONVERTER_DEFAULT_TIMEZONE_IS_SYSTEM_TIMEZONE</param-name>
    <param-value>true</param-value>
</context-param>

Why does not the date still appear in my message box?

I've printed the value like this;

public void carregarDadosVenda(){

        vendaCadastro.setHorario(new Date());
    System.out.println("Horário >>>>>>>>>>>>>>>>"  + vendaCadastro.getHorario());   
    }

And I had this result here;

Schedule > > > > > > > > > >> Mon Aug 31 14:59:05 BRT 2015

===================================================== ========================

Something even stranger has happened;

I decided to redo the code all over again, and it worked again, but the time was wrong, and I wanted to synchronize the time with the TomCat server, and put that line of code in web.xml

<context-param>
    <param-name>javax.faces.DATETIMECONVERTER_DEFAULT_TIMEZONE_IS_SYSTEM_TIMEZONE</param-name>
    <param-value>true</param-value>
</context-param>

After I did this, I no longer see the time in the dialog box, I even deleted it in the code line of the web.xml file, but there was no way, the time does not appear in the dialog box anymore.

Why does this happen?