/**
  * testTimezoneConversion
  */
 public function testTimezoneConversion()
 {
     $exampleFilterData = self::getPersistentFilterData();
     $savedFilterData = $this->testSaveFilter($exampleFilterData);
     $testUserTimezone = Tinebase_Core::get(Tinebase_Core::USERTIMEZONE);
     Tinebase_Core::set(Tinebase_Core::USERTIMEZONE, $testUserTimezone !== 'US/Pacific' ? 'US/Pacific' : 'UTC');
     $originalDueDateFilter = $this->_getFilter('due', $exampleFilterData);
     $convertedDueDataFilter = $this->_getFilter('due', $this->_uit->getPersistentFilter($savedFilterData['id']));
     Tinebase_Core::set(Tinebase_Core::USERTIMEZONE, $testUserTimezone);
     $this->assertNotEquals($originalDueDateFilter['value'], $convertedDueDataFilter['value']);
 }