Edit the following in getmail.php around the line 255

Replace this

// Parse Date.
// TODO: dh> use strftime (after format validation)? or strptime (PHP>=5.1.0)
// of the form '20 Mar 2002 20:32:37'
if(!preg_match('#^(.{3}, )?(\d{2}) (.{3}) (\d{4}) (\d{2}):(\d{2}):(\d{2})#', $ddate, $match))
{
	echo_message( 'Could not parse date header!', ERROR, 0);
	//pre_dump($ddate);
	return false;
}

$dmonths = array(
	'Jan' => 1,
	'Feb' => 2,
	'Mar' => 3,
	'Apr' => 4,
	'May' => 5,
	'Jun' => 6,
	'Jul' => 7,
	'Aug' => 8,
	'Sep' => 9,
	'Oct' => 10,
	'Nov' => 11,
	'Dec' => 12,
);

$ddate_H = $match[5];
$ddate_i = $match[6];
$ddate_s = $match[7];

if( ! isset( $dmonths[$match[3]] ) )
{
	echo_message( 'Invalid month name in message date string.', ERROR, 0 );
	return false;
}
$ddate_m = $dmonths[$match[3]];
$ddate_d = $match[2];
$ddate_Y = $match[4];

$ddate_U = mktime( $ddate_H, $ddate_i, $ddate_s, $ddate_m, $ddate_d, $ddate_Y );
$post_date = date( 'Y-m-d H:i:s', $ddate_U );

return true;

With this

// Parse Date
if(!preg_match('#^(.{3}, )?(\d{2}) (.{3}) (\d{4}) (\d{2}):(\d{2}):(\d{2})#', $ddate, $match))
{
	$ddate_U = @strtotime($ddate);
	if( empty($ddate_U) || strlen($ddate_U) < 2 )
	{
		echo_message( sprintf( 'Could not parse date header "%s"', $ddate ), ERROR, 0);
		return false;
	}
}

if( empty($ddate_U) )
{
	$dmonths = array(
		'Jan' => 1,
		'Feb' => 2,
		'Mar' => 3,
		'Apr' => 4,
		'May' => 5,
		'Jun' => 6,
		'Jul' => 7,
		'Aug' => 8,
		'Sep' => 9,
		'Oct' => 10,
		'Nov' => 11,
		'Dec' => 12,
	);

	$ddate_H = $match[5];
	$ddate_i = $match[6];
	$ddate_s = $match[7];

	if( ! isset( $dmonths[$match[3]] ) )
	{
		echo_message( 'Invalid month name in message date string.', ERROR, 0 );
		return false;
	}
	$ddate_m = $dmonths[$match[3]];
	$ddate_d = $match[2];
	$ddate_Y = $match[4];

	$ddate_U = mktime( $ddate_H, $ddate_i, $ddate_s, $ddate_m, $ddate_d, $ddate_Y );
}

$post_date = date( 'Y-m-d H:i:s', $ddate_U );

echo_message( 'Date: ' . $post_date, INFO, 3 );

return true;

I just noticed that thee is a 4.1.1 release. I may just upgrade. Is this already fixed in the 4.1.1 release or will I have to change it there too.

The fix is not there yet. Expect it in b2evo 4.2.x

So is this still going to be fix in 4.2.x? and when is 4.2.x eta?

v4.2 was transformed into v5 :)
There's still no public version around, only devs have access to it.