problem with timestamp data type

Hi to all,
I have a strange error on using of timestamp data type.
See the follow table definition and insert command.

DROP TABLE IF EXISTS Storicocorrenti;
CREATE TABLE Storicocorrenti (
ID_LINEA mediumint(6) unsigned zerofill NOT NULL default '000000',
DATAORA timestamp NOT NULL default '0000-00-00 00:00:00',
DFASEABS smallint(3) default NULL,
TENSIONE decimal(9,2) default NULL,
POTATT decimal(7,3) default NULL,
POTREA decimal(7,3) default NULL,
DFASEVI smallint(3) default NULL,
CORRENTE decimal(6,2) default NULL,
PRIMARY KEY (ID_LINEA,DATAORA)
) ENGINE=MyISAM DEFAULT CHARSET=latin1;

INSERT INTO Storicocorrenti VALUES (032100, '2005-03-27 01:00:00', 0,
'400000.00', '0.000', '0.000', 0, '0.00');
INSERT INTO Storicocorrenti VALUES (032100, '2005-03-27 02:00:00', 0,
'400000.00', '0.000', '0.000', 0, '0.00');

Watching the table content, I see second record as:

032100, '2005-03-27 03:00:00', 0, '400000.00', '0.000', '0.000', 0, '0.00'

MySql change the time information of DATAORA field from "02:00:00" to "03:00:00".

This error is reproducible on various version of mysql. I have tried it on 3.23,
4.1, 5.0

On Postgres DB all is ok. I have similar record at same time but other date and
in these case the problem is not present.

Can you help me to resolve it?
Thanks in advance

Alessandro Agostini
IFAC - CNR
Italy


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