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 : 15/10/2018
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The DE server comes with its own Java.  It is located inside the install directory.  The timezone information may need to be updated for new DST and timezone changes.
E.g.  Linux/UNIX
C:\Program Files\CA\WorkloadAutomationDE\jre



CA Workload Automation DE
OS Any
For any new timezone or DST update, it is recommended to run the tzupdater for the DE JRE.   
1. Download the tzupdater from here.
2. Navigate to <DE_install_directory>/jre/bin
3. Run the tzupdater command:
./java -jar /tmp/tzupdater.jar -l
java -jar C:\temp\tzupdater.jar -l 
Note: The above examples indicate that tzupdater was placed in /tmp or C:\temp directory.
4. Once update completes, restart the DE service

For more information, please this Oracle Java link.
Additional Information:
Note: Follow the same steps as above to update the Desktop Client JRE.