Description:
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I tripped across this bug calculating the number of days between two dates. It seems like something goes screwy in April and 0.041666667 seconds get dropped. The code below checks the difference in days between May 31 and the first 10 days of April. 

Reproduce code:
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for ($iyear=2000;$iyear<= 2006;$iyear++) {
	$s_st=$iyear."-03-31";
	$st=strtotime($s_st);
	for ($i=1;$i<=10;$i++) {
		$addsecs=$st + ($i * 60 * 60 * 24);
		$end = st + $addsecs;
		$s_end=Date("Y-m-d",$end);
		$end = strtotime($s_end);
		$idiff = ($end - $st) / (60 * 60 * 24);
		echo("Start: $s_st End: $s_end Diff: $idiff<br>");
	}
	echo("<hr>");
}


Expected result:
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I would expect to see the number of days between the dates in question 

Actual result:
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Here's the results for just for 2006

Start: 2006-03-31 End: 2006-04-01 Diff: 1
Start: 2006-03-31 End: 2006-04-02 Diff: 2
Start: 2006-03-31 End: 2006-04-03 Diff: 2.9583333333333
Start: 2006-03-31 End: 2006-04-04 Diff: 3.9583333333333
Start: 2006-03-31 End: 2006-04-05 Diff: 4.9583333333333
Start: 2006-03-31 End: 2006-04-06 Diff: 5.9583333333333
Start: 2006-03-31 End: 2006-04-07 Diff: 6.9583333333333
Start: 2006-03-31 End: 2006-04-08 Diff: 7.9583333333333
Start: 2006-03-31 End: 2006-04-09 Diff: 8.9583333333333
Start: 2006-03-31 End: 2006-04-10 Diff: 9.9583333333333