Description:
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When I user the function strtotime on february, I get a wrong timestamp.

Reproduce code:
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$timestamp = strtotime("1 february 2005");
$timestamp = strtotime("2 Monday", $timestamp);
//No problem display "14-02-2005 -- Monday"
echo date("d-m-Y -- l ", $timestamp);
	
echo "<br />";
$timestamp = strtotime("1 february 2005");	
$timestamp = strtotime("3 Monday", $timestamp);	
//Display 20-02-2005 -- Sunday instead of 21-02-2005 -- Monday
echo date("d-m-Y -- l ", $timestamp);

Expected result:
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The second echo command should display the third Monday of february, but it displays Sunday.