Dave, You can set a time zone via the Manage System Time (MST) panels to set the time zone for the CTN, and you can choose to set DST manually or automatically. When there is a DST change all z/OS systems running in an LPAR on a CPC in the STP CTN that specify STPMODE YES will get a Time Controls Parameter Change external interrupt and if the system specifies STPZONE YES then process the DST change.
What you need to do is set the time zone via the STP and perform DST changes automatically is: 1. Manage System Time -> Current Time Details -> Adjust time zone offset. Choose the time zone and select Automatically adjust for DST 2. Specify STPMODE YES and STPZONE YES in CLOCKxx For systems that will be managed manually: 1. Specify TIMEZONE d.hh.mm.ss, STPMODE YES and STPZONE NO in CLOCKxx 2. Issue SET TIMEZONE d.hh.mm at the appropriate time 3. Update TIMEZONE in CLOCKxx so that the correct time zone is used at the next IPL. Note, you can only specify one time zone for the STP CTN. If you need to manage multiple time zones then the other time zones need to be managed manually. George Kozakos z/OS Software Service, Level 2 Supervisor -----Original Message----- From: IBM Mainframe Discussion List <IBM-MAIN@LISTSERV.UA.EDU> On Behalf Of Jousma, David Sent: Tuesday, July 23, 2024 11:19 AM To: IBM-MAIN@LISTSERV.UA.EDU Subject: [EXTERNAL] CTN's and auto DST changes All, I have a question in to IBM, but they are slower than molasses in responding. Since implementing GDPS, we have 50+ images to manage. Historically, because of application dependencies, we've managed the change to DST manually with SET TIMEZONE commands. Now that we have a lot of K systems, etc, I'd like to have the majority of lpars set spring forward/back automatically for all lpars that can, and just manually control those that still have the application limitation(it uses local time, not UTC). Its not clear to me how to have a mix of both when creating CTN's on the HMC? Or maybe there is nothing to set there, except the correct time zone, and its just a matter of updating CLOCK00 to remove the TIMEZONE, and set STPZONE YES? Just trying to get some feedback from those that have done it. Don't want to mess up the timing network in my environment.... Thanks, Dave Dave Jousma Vice President | Director, Technology Engineering This e-mail transmission contains information that is confidential and may be privileged. It is intended only for the addressee(s) named above. If you receive this e-mail in error, please do not read, copy or disseminate it in any manner. If you are not the intended recipient, any disclosure, copying, distribution or use of the contents of this information is prohibited. Please reply to the message immediately by informing the sender that the message was misdirected. After replying, please erase it from your computer system. Your assistance in correcting this error is appreciated. ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
