Help with insert mysql statement

Need some help with this mysql statement

$outDate =  $_GET["mout"].$_GET["dout"].$_GET["yout"];
$inDate =  $_GET["min"].$_GET["din"].$_GET["yin"];

echo "OutDate:".$outDate; 
echo "inDate:".$inDate;

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my output is:
OutDate:04 21 2011 inDate:04 24 2011

outdate and indate are date fields in the database. I want to eliminate the white space and put it in the correct format for my mysql table. Currently the data is inserted however I get an error about the date time data not being correct.

$sql="INSERT INTO orderitem (ID, onum,outdate,indate,itemrentqty,itemnum)
 VALUES
 ( ' ', $_GET[ordernum], '$outDate', '$inDate' ,$_GET[itemqty], $_GET[itemnum])";

if (!mysql_query($sql,$con))
 {
 die('Error: ' . mysql_error());
 }

mysql_close($con);

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How do I correctly insert the date into my table? Thanks