Description:
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I make day's timestamps adding 1 day in seconds (86400s) to previous timestamp. I got strange result with 03/26/2006 and 03/27/2006. (tested on winxp and debian linux)

Reproduce code:
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## 26.03.2006 00:00:00
$timestamp = 1143327600;
print date ("d.m.Y H:i:s", $timestamp)."<br>";

## add 1 day in seconds (86400)
$timestamp += 24 * 60 * 60; 
## should be 27.03.2006 00:00:00
## result is 27.03.2006 01:00:00
print date ("d.m.Y H:i:s", $timestamp)."<br>";


Expected result:
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26.03.2006 00:00:00
27.03.2006 00:00:00

Actual result:
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26.03.2006 00:00:00
27.03.2006 01:00:00