March 2008 Newsletter – Daylight Savings


Remember, this Sunday morning at 2:00am we change our clocks to “Spring forward” to Daylight Savings time.  Is your AS/400, iSeries, and/or i5 ready?  Our regular monthly newsletter will be out in the middle of the month, but we wanted everyone to be aware of the time change.


The Energy Policy Act of 2005 was passed by the United States Congress on July 29, 2005 and signed into law on August 8, 2005. This law changes the time-change dates for Daylight Savings Time in the United States. Beginning in 2007, DST will begin on the second Sunday in March and end on the first Sunday in November.


Check below to make sure your system has the right PTFs installed for Daylight Savings Time and that the corresponding System Values are set correctly.


In addition, the National Fire Center recommends that you change your batteries in your home smoke detectors this weekend as well.  Who else keeps you safe and secure like iTech Solutions?


iTech Solutions can help you improve performance, upgrade OS/400, perform security audits, implement a High Availability solution, VoIP, Systems Management, PTF management, upgrade an existing machine, or upgrade to a new machine. If you are thinking of LPAR or HMC, then think iTech Solutions.


We have the skills to help you get the most out of your System i.  For more information on any of the articles below, please contact us at [email protected] . We would also like to know what you think of this newsletter and any items you would like us to discuss in future issues.

Daylight Savings TIme
Since V5R3, i5/OS  automatically changes the time on the machine, but you need to make sure you have the correct PTFs installed. Otherwise i5/OS won’t change the time for another 3 weeks (see TIMZON below).  First, check to make sure that you have the following PTFs installed on your system. If you are on the iTech Solutions Quarterly PTF maintenance program, you are all set and have nothing to worry about.


Release               PTFs

V5R4       SI26040 & SI25990

V5R3       SI26039 & SI25991


These PTFs are part of i5/OS 5722-SS1. If you are on V5R2, you will have to manually adjust your time, using WRKSYSVAL QTIME. You will also need to change the System Value for the Universal Offset,  QUTCOFFSET. This value should represent the number of hours difference from Greenwich Mean Time.  You only need to change this if you are at V5R2, otherwise this value is automatically changed at V5R3 and above.

The Time Zone that the machine is set up to use, determines when to change the clocks.  If you have installed the correct PTFs, then your time zone value for the System Value QTIMZON should be one of these depending on your location.

Location            QTIMZON

Eastern            QN0500EST3

Central           QN0600CST2

Mountain         QN0700MST3

Pacific             QN0800PST2

If you are using a Hardware Management Console, there are also PTFs required. Any HMC running below Version 6.1 will need to get the required PTFs. I would recommend that you should be at Version 7.3.2 on your HMC for the added functionality, but that is another article.

Contact iTech Solutions  and schedule a time when someone can come in and discuss how our Quarterly PTF maintenance will keep your system up to date and remove you from worrying about your PTF maintenance.

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