Neos\Eel\Tests\Unit\DateHelperTest::calculationExamples PHP Метод

    public function calculationExamples()
    {
        $dateTime = \DateTime::createFromFormat('Y-m-d H:i:s', '2013-07-03 12:34:56');
        return ['add DateTime with DateInterval' => ['add', $dateTime, new \DateInterval('P1D'), '2013-07-04 12:34:56'], 'add DateTime with string' => ['add', $dateTime, 'P1D', '2013-07-04 12:34:56'], 'subtract DateTime with DateInterval' => ['subtract', $dateTime, new \DateInterval('P1D'), '2013-07-02 12:34:56'], 'subtract DateTime with string' => ['subtract', $dateTime, 'P1D', '2013-07-02 12:34:56']];
    }