If you’d ever attended one of Roy’s or my workshops, you know that we talk about time zone adjustments after the database upgrade. We explain why this is important. But as everything, it depends if you really need to apply and adjust. In our workshops we recommend one single note for time zone adjustments: MOS Note:412160.1 . This note has been updated and republished. It contains DST V.32 and DST V.33 links and references. Amit Grover from AWS contacted me and told me about a potential dependency of DST patches to the Oracle Update such as RU 18.4.0 or 18.5.0….