Query with TIMESTAMP, PHP+IBASE

i'm having problems with this.

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ibase_timefmt("%m/%d/%Y %H:%M:%S", IBASE_TIMESTAMP);
//both, with string and mktime don't work!
$FromDate = "24/10/2003 17:50:40";
//$FromDate = mktime (17,50,40,10,24,2003);
$ToDate = "27/10/2003 17:50:40";
//$ToDate = mktime (17,50,40,10,30,2003);

$stmthistory = "select * from machine_history where (hdate >= ('$FromDate')) and (hdate <= ('$ToDate'));";

$queryhistory = ibase_prepare($stmthistory);
$rshistory=ibase_execute($queryhistory,$stmthistory);

$rowhistory = ibase_fetch_row($rshistory);


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this code return the error:
Warning: ibase_fetch_row(): conversion error from string "27/10/2003 17:50:40" in ..........

how do i make this query?
thanks.


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Try '2003-10-27 17:50:40' with simple quotes