Group by minute

Hil list,<br /><br />I have a query but my IDE (Delphi) does not accept "to_char" capability. Is there a way to
reproducethe same query without using to_char function ?<br /><br />Here is my query:<br />SELECT 
to_char(quando,'dd/MM/yyyyHH24:MI'),count(id) <br />FROM base.tentativa<br />WHERE  (SESSAO_ID = 15) <br />GROUP BY
to_char(quando,'dd/MM/yyyyHH24:MI')<br />order by 1<br /><br />Regards ...<br clear="all" /><br />-- <br />
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/>                                  Atenciosamente(Sincerely)<br />                        Ezequias Rodrigues da
Rocha<br/> =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-<br />A pior das democracias ainda é
melhordo que a melhor das ditaduras <br />The worst of democracies is still better than the better of dictatorships<br
/><ahref="http://ezequiasrocha.blogspot.com/">http://ezequiasrocha.blogspot.com/</a>