ZF-5765: Zend_Date unit test alters value of static variable fix_dst. This biases later tests.
Zend/DateTest.php, function testAddMonth, line 4180:
Zend_Date::setOptions(array('fix_dst' => false));
The above code alters a static variable such that it differs from the default. This influences the outcome of later tests.
This is the cause of the ZF-5745.