If you tell it to zVM will adjust its time. If you tell it not to it then it doesn't. If you don't say anything the default is to not change it. You need to use PROP (the programmable operator) to issue a SET TIMEZONE command at the time you want to change zones. You should have the hardware clock set to UCT (GMT) and all the DEFINE TIMEZONES that you will need in your SYSTEM CONFIG file along with the other commands that are needed to make the system be in the correct zone when you do an IPL. In the past you had to have PROP take down some servers before issuing the SET TIMEZONE and bring them back up after issuing it. However, IBM has fixed most (all?) of its servers so you don't need to do that anymore. Some third party software still needs to be shut down and restarted after the zone changes.
VSE has had commands added to it to adjust its time to VM. If you are running VSE guests then those commands need to be issued either by PROP or by a VSE scheduler. Stephen Frazier Oklahoma Department of Corrections -----Original Message----- From: [EMAIL PROTECTED] [mailto:owner-linux-390@;VM.MARIST.EDU]On Behalf Of Davis, Jeff Sent: Tuesday, October 22, 2002 12:18 PM To: 'Linux on 390 Port' Subject: RE: [LINUX-390] time change zVM will not adjust its own time. You can use the DEFINE TIMEZONE and SET TIMEZONE commands to change the time for VM. Be sure to adjust your SYSTEM CONFIG file accordingly. Guest systems, however, may not take this well. CMS will not automatically adjust. If you have processes running under CMS, they will need to be logged off and logged back on. If linux are your only guests, they may be OK. To be safe, we are taking our system down and leaving it down for an hour. -----Original Message----- From: Alan Cox [mailto:alan@;lxorguk.ukuu.org.uk] Sent: Tuesday, October 22, 2002 11:11 AM To: [EMAIL PROTECTED] Subject: Re: [LINUX-390] time change On Tue, 2002-10-22 at 17:28, Lionel Dyck wrote: > Will linux and z/vm automatically adjust the time or does it have to be > done manually this weekend? Linux lives in UTC time. What happens depends upon the timezone that process has chosen to occupy. If its a normal timezone (US east coast, UK etc) then yes it will automatically account for summer time/winter time shifts, leap years and any IERS pre-published leap seconds in its tables. Alan The information in this electronic mail message is sender's business Confidential and may be legally privileged. It is intended solely for the addressee(s). Access to this Internet electronic mail message by anyone else is unauthorized. If you are not the intended recipient, any disclosure, copying, distribution or any action taken or omitted to be taken in reliance on it is prohibited and may be unlawful. The sender believes that this E-mail and any attachments were free of any virus, worm, Trojan horse, and/or malicious code when sent. This message and its attachments could have been infected during transmission. By reading the message and opening any attachments, the recipient accepts full responsibility for taking protective and remedial action about viruses and other defects. Galileo International is not liable for any loss or damage arising in any way from this message or its attachments.
