Is my first sentence correct if I change it to "The z/OS system clock is (if your shop follows best practices) set to Universal Coordinated Time (UTC, similar to Greenwich >Mean Time or GMT)."?
Charles -----Original Message----- From: IBM Mainframe Discussion List [mailto:[email protected]] On Behalf Of Charles Mills Sent: Tuesday, September 17, 2013 5:29 PM To: [email protected] Subject: Re: CVTLSO, SMF, and RMF (was: Where environment variables ...) SMF time fields are all over the map. Some are local, some are GMT, some are in STCK format, some are in hundredths of a second. Just for laughs, some are tttttttt 0cyydddF and some are 0cyydddF tttttttt. DB2 writes a shifted STCK format. *Most* time fields are built by the individual record cutting product. If a product wants to record time as Latvian Summer Time expressed in Roman numerals in its SMF records it is free to do so. Thus one cannot say "SMF time fields are thus and such" (unfortunately). Hmmm. I see the discussion of TAI and UTC in P[ro]Op but not sure I fully grasp what it all means relative to the actual setting of the system clock. The clock is set from the HMC on Power On, is that right? I don't have those manuals, at least not in front of me. What do the relevant manuals say and/or recommend? Yes, my writing is a little sloppy. What I mean is "set the hardware clock to UTC-ish time as opposed to local time." I will clean up my writing if someone can straighten me out on the questions in the paragraph above. Interesting note in P[ro]Op: "The reader should be aware of the fact that this publication contains many symbols, such as superscripts, that may not display correctly with any given hardware or software. The definitive version of this publication is the hardcopy version" (which BTW does not exist anymore!) Charles -----Original Message----- From: IBM Mainframe Discussion List [mailto:[email protected]] On Behalf Of Paul Gilmartin Sent: Tuesday, September 17, 2013 4:56 PM To: [email protected] Subject: CVTLSO, SMF, and RMF (was: Where environment variables ...) On Tue, 17 Sep 2013 16:08:26 -0400, Charles Mills wrote: > >Time Settings > >The zArchitecture hardware clock is (if your shop follows best >practices) set to Universal Coordinated Time (UTC, similar to Greenwich >Mean Time or GMT). > I believe not. By best practice it is set (and steered by STP) to TAI - 10 seconds (strangely enough.) All described (often correctly) in at least 3 tables in the P[ro]Op. ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
