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| matthewmatcham |
 Posted: Wed Sep 06, 2006 1:51 am Post subject: Timezone in WSMQ on Z/OS |
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Novice
Joined: 06 Sep 2006
Posts: 12
Location: UK
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Hi
I've noticed that our implementation of MQ on z/OS does not adjust for daylight savings. Therefore for part of the year MQ messages have a creation time in the MQMD that is an hour out of sync. Is this a configurable option? I've spoken to a sysprog who says that it isn't, but this seems strange to me. I'm based in the UK and all other features on z/OS are correctly configured for this e.g. CICS, DB2 etc.
I'm a developer and this is an irritating feature, particularly for support reasons when looking at the creation time in the MQMD of a message. I've also had more than one instance where I've wanted to use the MQMD creation time in an application but avoided it for this reason.
We're running WSMQ 5.3 on z/OS 1.4. |
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| tleichen |
| Posted: Wed Sep 06, 2006 6:26 am Post subject: |
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Yatiri
Joined: 11 Apr 2005
Posts: 663
Location: Center of the USA
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It does not adjust for daylight saving time (DST), because it does not need to. MQSeries timestamps are always GMT. DST is not an issue. 
Only your local time changes relative to GMT, if you are in a location that observes DST. Since you're in the UK, you must be in the same time zone as Greenwich, but go to DST at certain times of year. There are several routines builtin to the mainframe that will convert GMT to local time. 
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Last edited by tleichen on Wed Sep 06, 2006 6:56 am; edited 1 time in total |
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| matthewmatcham |
| Posted: Wed Sep 06, 2006 6:55 am Post subject: |
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Novice
Joined: 06 Sep 2006
Posts: 12
Location: UK
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| tleichen wrote: |
MQSeries timestamps are always GMT. Daylight saving time (DST) is not an issue.
Only your local time changes relative to GMT, if you are in a location that observes DST. |
When we're observing daylight savings, CICS time (e.g. EIBTIME) and DB2 time (e.g. CURRENT TIMESTAMP) also observe them and are consistent with local times. However MQ does not... |
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| tleichen |
| Posted: Wed Sep 06, 2006 6:58 am Post subject: |
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Yatiri
Joined: 11 Apr 2005
Posts: 663
Location: Center of the USA
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Read my post again. All MQSeries timestamps are GMT.
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| matthewmatcham |
| Posted: Wed Sep 06, 2006 7:09 am Post subject: |
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Novice
Joined: 06 Sep 2006
Posts: 12
Location: UK
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Sorry, yes I see that but I don't understand the "not an issue" part. If your local time is not GMT then other products on z/OS such as CICS or DB2 will observe the daylight savings and adjust their time zones accordingly. Therefore the timestamps displayed in the MQMD are out of sync with everything else during these times.
Sorry if I seem confused but I am |
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| tleichen |
| Posted: Wed Sep 06, 2006 7:19 am Post subject: |
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Yatiri
Joined: 11 Apr 2005
Posts: 663
Location: Center of the USA
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Your confusion is due to the fact that you happen to live in the timezone where GMT is. For you, MQ appears like it has local time stamps for half of the year. That is only because of where you are. For the rest of us, the MQSeries timestamps never match local time of the machine.
As I said earlier, you need to convert MQ timestamps to local time always! There are different routines for different languages that will convert local time to GMT and vice-versa.
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IBM Certified MQSeries Developer |
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| matthewmatcham |
| Posted: Wed Sep 06, 2006 7:40 am Post subject: |
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Novice
Joined: 06 Sep 2006
Posts: 12
Location: UK
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| tleichen wrote: |
Your confusion is due to the fact that you happen to live in the timezone where GMT is. For you, MQ appears like it has local time stamps for half of the year. That is only because of where you are. For the rest of us, the MQSeries timestamps never match local time of the machine.
As I said earlier, you need to convert MQ timestamps to local time always! There are different routines for different languages that will convert local time to GMT and vice-versa. |
Okay, got it!! So this is indeed a common theme, and can't be reconfigured.
Thanks for your patience! |
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| Terder01 |
| Posted: Sat Oct 21, 2006 10:31 am Post subject: |
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Newbie
Joined: 20 Oct 2006
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| LuisFer |
| Posted: Sat Oct 21, 2006 11:54 am Post subject: |
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Partisan
Joined: 17 Aug 2002
Posts: 302
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| Terder01 wrote: |
| http://adriennebarbeau.org/movies/1 |
Be carefull with this link |
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| fjb_saper |
| Posted: Sat Oct 21, 2006 4:03 pm Post subject: |
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Grand High Poobah
Joined: 18 Nov 2003
Posts: 20697
Location: LI,NY
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| LuisFer wrote: |
| Terder01 wrote: |
| http://adriennebarbeau.org/movies/1 |
Be carefull with this link |
I never download the codec from those sites... You don't know what kind of backdoor it might open...(pun)...
Enjoy 
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