NOTNULL DATETIME column created without default value is incorrectly mapped to 1970-01-01

Having created a table with a DATETIME column.

CREATE TABLE IF NOT EXISTS `props` (
  ...
  `DATETIME_VALUE` datetime NOT NULL,
  ...
) ENGINE=MyISAM DEFAULT CHARSET=latin1;

SELECT DATETIME_VALUE FROM `props` LIMIT 0 , 30
returns: 0000-00-00 00:00:00

Now, having declared the following in my schema file:

provider db_xyz {
 var db_xyz;
 type DBSource;

 table props {
                ...
  DATETIME_VALUE<DateTime>;
 }
}

entity SomeEntity {
 fields {
               ...
  Value<DateTime>;
 }
}

mapper SomeEntity {
 provider db_xyz;
 fields {
  using props {
   @DATETIME_VALUE = Value;
  }
 }
}

$lastrun = strftime( "%Y-%m-%d %H:%M:%S", SomeEntity::findWithXYZ( ... )->value);

$lastrun is 1970-01-01 01:00:00, not 0000-00-00 00:00:00