I stand corrected. Thanks for decreasing my ignorance in this area with those links.
Peter R., apologies for my mistaken understanding of the TOD clock value. I now much better appreciate your repeated statements about the TOD clock value being architecturally TAI - 10. Peter -----Original Message----- From: IBM Mainframe Discussion List [mailto:IBM-MAIN@LISTSERV.UA.EDU] On Behalf Of Paul Gilmartin Sent: Saturday, December 29, 2018 1:06 AM To: IBM-MAIN@LISTSERV.UA.EDU Subject: Re: TOD clock values, leap seconds and BLSUXTOD conversion service On Fri, 28 Dec 2018 23:52:07 -0600, Paul Gilmartin wrote: >> ... >I believe otherwise. In order to avoid discontinuities at leap seconds of the >sort >that cause network failures: > > https://en.wikipedia.org/wiki/Leap_second#Examples_of_problems_associated_with_the_leap_second >the TOD clock runs (**at IBM's strong recommendation**) at a constant rate, >TAI - 10 seconds. (I know no clear documentation of this (can someone help >me?), >but inferred it by converting the hex values in the PoOps.) > Ah! Found it! 4.6.1.5 "z/Architecture Principles of Operation" IBM Library Server https://www.ibm.com/support/libraryserver_os390/BOOKS/DZ9ZR003/4.6.1.5?SHELF=ez2vse00&DT=20040504121320 4.6.1.5 TOD Programmable Register ... For the same reasons, conversion between ETR time and UTC does not take into consideration the time adjustments prior to 1972, and, thus, ETR time differs from TAI by a fixed amount of 10 seconds. Because of the occurrence of 22 leap seconds, UTC now is behind TAI by 32 seconds. -- This message and any attachments are intended only for the use of the addressee and may contain information that is privileged and confidential. If the reader of the message is not the intended recipient or an authorized representative of the intended recipient, you are hereby notified that any dissemination of this communication is strictly prohibited. If you have received this communication in error, please notify us immediately by e-mail and delete the message and any attachments from your system. ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
