Daylight Savings Time Change Requirements

Document ID : KB000011942
Last Modified Date : 14/02/2018
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Time change requirements for CA-IDMS.


For Daylight Savings, do we still have to shut down for one hour each fall when switching back to Standard Time?

CA-IDMS all releases and operating systems.

No. Starting with CA IDMS 18.5 there is nothing you need to do when your local time changes. Journals have used UTC datetime stamps for many releases and Log records were changed to use UTC instead of local time as of 18.5. This feature is automatically enabled. No extra action is required to activate it. 

Important! Before starting an 18.5 CV for the first time, start with a fresh log file. Do not mix the log data from the previous release with the log data from the new release. Mixing data is problematic, as the time stamps in the old release are in local time, but the new data is stamped in UTC time. 

You can decide to use the UTC keyword on Archive Log jobs, so that printed log times do not change during time changes.

For clients running r18.0 of CA-IDMS or earlier, or clients on z/VSE, please see QI52458.
Note that support for r18.0 of CA-IDMS on z/OS was dropped on August 31, 2016.

Additional Information:

CA IDMS18.5 Release Summary, Daylight Savings Time - UTC Time Stamps