PHP small date error

Hi
im using the following code:
-------------------------------
when i run it i got the following error

Strict Standards: date() [function.date]: It is not safe to rely on the system's timezone settings. Please use the date.timezone setting, the TZ environment variable or the date_default_timezone_set() function. In case you used any of those methods and you are still getting this warning, you most likely misspelled the timezone identifier. We selected 'Europe/Helsinki' for '2.0/no DST' instead in C:\AppServ\www\bs\doAdd.php on line 7

any ideas ?
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<? include("comm/connection.php");?>
<?
$from=$_REQUEST[from];
$email=$_REQUEST[email];
$msg_title=$_REQUEST[msg_title];
$body=$_REQUEST[body];
$date_=date(ymdh);
mysql_query("insert into income_messages_tb(from,email,msg_title,msg_body,date) values ('$from','$email','$msg_title','$body','$date_');");
 
//echo "<meta http-equiv='refresh' content='0;URL=contact.php?msg=Thanks for yout message' />";
 
?>