BUG: Zend_Date changes automatically the timezone after setting the unix timestamp to -100000000

Wanted to outline a very interesting bug found in Zend_Date component. After settings  the timestamp to -100000000 it changes the timezone.

ini_set('date.timezone', 'UTC');

$date = new Zend_Date();
$date->setTimezone('Europe/Berlin');
$date->set(-100000000);

So you will receive:

Zend_Date Object
(
    [_locale:private] => de
    [_fractional:private] => 0
    [_precision:private] => 3
    [_unixTimestamp:private] => -100000000
    [_timezone:private] => Etc/GMT+10
    [_offset:private] => 36000
    [_syncronised:private] => 0
    [_dst:protected] => 1
)

If you will set the timestamp to -99999999 it works as expected.
So the workaround is to set the timezone after you will set your timestamp.

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