Description:
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day Oct 30 has 90000 seconds a day. 
I only test year 2005,2006,2007 in Version is php 5.1.4 and 5.1.6. I didn't install 5.1.5.
the result is right on php 4.4.3

Reproduce code:
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<?
$st=mktime(0, 0, 0, 10, 30,2007);
$st1=mktime(0, 0, 0, 10, 31,2007);
echo "seconds:".($st1 - $st)."<br>";
?>

Expected result:
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seconds:86400

Actual result:
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seconds:90000