Description:
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I get the same date() output regardless of TZ setting on Windows XP. I suspect it must be a configuration error, as I get the same problem with PHP 4.4.2, 4.4.6 and 5.2.1 with date.timezone = Pacific/Auckland
Have also tried on two separate Windows XP machines.
Doing this on Linux works fine and gives expected result.
Web Server is Apache 2.0.55

Reproduce code:
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<?php
putenv("TZ=Pacific/Auckland");
echo "Pacific/Auckland Time: ". date("h:i:s a T")."<br/>";
putenv("TZ=Australia/Sydney");
echo "Australia/Sydney Time: ". date("h:i:s a T")."<br/>";
?>

Expected result:
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I expect to see the timestamp for Pacific/Auckland to be GMT+12
I expect to see the timestamp for Australia/Sydney to be GMT+10




Actual result:
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I get both times output identical as UTC/GMT

e.g.

Pacific/Auckland Time: 09:01:22 pm Pac
Australia/Sydney Time: 09:01:22 pm Aus