An operating system itself might not be set for the daylight savings adjustment - if it's not set up, would dSeries still follow DST?

Document ID : KB000023778
Last Modified Date : 14/02/2018
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dSeries does not follow the DST information set at the operating system level, rather it follows the DST information retrieved from the dSeries JRE.

Therefore, yes, dSeries will follow DST change.

If any recent changes were made at your local time zone, please check the following site:

http://java.sun.com/javase/downloads/index.jsp#timezone

For the latest TZUpdater and if needed apply one to both Desktop Client and the dSeries server JREs.

The TZUpdater installation instructions could be found on aforementioned site.