Description:
------------
When performing the while loop shown in the code mktime function produces duplicate results on the following specific dates (2004-03-27) and (2003-03-29) and (2002-03-30). They all seem to be in the month of march. This starts afer 2001 and I havent yet checked how far it continues.

Because mktime is suppose to handle illegal days and therefore recalcuate the whole date I cant see why this would happen.



Reproduce code:
---------------
$starting = strtotime("2001-01-01");
$ending = strtotime("2005-01-01");
$newdate = $starting;
$day 	= date("d",$newdate);
$month 	= date("m",$newdate);
$year 	= date("Y",$newdate);

echo("Starting->".date("Y-m-d",$newdate)."<br>");
echo("Ending->".date("Y-m-d",$ending)."<br>");
$x = 0;
while($newdate<$ending){

	$newdate = mktime(0,0,0,$month,($day+$x),$year);
	$fulldate = date("Y-m-d",$newdate);
	echo($fulldate."<br>");
	$x ++;	
}

Expected result:
----------------
Relevant Areas...

2002-03-29
2002-03-30 <- just one as you would expect
2002-04-01
2002-04-02
2002-04-03
...skip output...
2003-03-27
2003-03-28
2003-03-29 <- Just one as you would expect
2003-03-31
2003-04-01

and so on...

Actual result:
--------------
Relevant Areas...

2002-03-28
2002-03-29
2002-03-30 
2002-03-30 <- Duplicate Date
2002-04-01
2002-04-02
...skip output...
2003-03-27
2003-03-28
2003-03-29
2003-03-29 <- Duplicate Date
2003-03-31
2003-04-01