Much to my regret I've seen the discussion on topic "RE-IPL for the Daylight to 
Standard time conversion?" too late, and was unable to read all posts on the 
issue, so bear with me if it turns out that someone else has already mentioned 
an excellent publication I'm mentioning now:
  
SG24-2070 - S/390 Time Management and IBM 9037 Sysplex Timer, at 
http://www.redbooks.ibm.com/redbooks/pdfs/sg242070.pdf
   
Chapter 9, "Offset Change Impacts to Subsystems", is worth reading (and so is 
Chapter 8).

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