On Mon, 9 Nov 2015 11:12:54 -0700, Paul Gilmartin wrote:
>
>Interesting information at:
> http://www-01.ibm.com/support/docview.wss?uid=swg21248101
>
> ... systems or applications that use the POSIX time zone format may
> not change time properly ...
>
> Systems and applications using the Olson time zone format are NOT affected.
> Do not take any action if you use Olson format. ...
>
>Does this embody a hint to z/OS development? Perhaps even grist for the RfE
>mill?
>
> https://en.wikipedia.org/wiki/Tz_database
>
In fact, Java appears Olson-savvy:
user@OS/390.25.00: date; /usr/lpp/java/J8.0_64/bin/java TimeZoneTest
Mon Nov 9 18:37:56 MST 2015
...
TimeZone : Asia/Pyongyang - Korea Standard Time
TimeZone :
sun.util.calendar.ZoneInfo[id="Asia/Pyongyang",offset=32400000,dstSavings=0,useDaylight=false,transitions=4,lastRule=null]
Date (String) : 10-11-2015 10:38:03 AM
Date (Object) : 10-11-2015 10:38:03 AM
...
user@OS/390.25.00: ls -ld /usr/lpp/java/J8.0_64/bin/java
-rwxr-xr-x 1 OMVSKERN OMVS 106496 Jul 16 02:23
/usr/lpp/java/J8.0_64/bin/java
However:
[email protected]: date; java TimeZoneTest
Mon Nov 9 18:38:21 MST 2015
...
TimeZone : Asia/Pyongyang - Korea Standard Time
TimeZone :
sun.util.calendar.ZoneInfo[id="Asia/Pyongyang",offset=30600000,dstSavings=0,useDaylight=false,transitions=5,lastRule=null]
Date (String) : 10-11-2015 10:08:22 AM
Date (Object) : 10-11-2015 10:08:22 AM
...
[email protected]: ls -alL `whence java`
-rwxr-xr-x 1 root root 37880 Aug 19 13:41 /usr/bin/java
Apparently, z/OS 2.2 is oblivious that North Korea set its clocks back a half
hour last
August 15. z/OS needs to institute a policy of updating the timezone data base
by PTF whenever a change in the Olson zone info is announced.
Hmmm ... Apparently IBM is cognizant of this:
https://www.ibm.com/developerworks/java/jdk/dst/olson_table.html
However:
... The time zone updates are applied by updating your Java™ SDK or JRE or
running the IBM Time Zone Update Utility for Java (JTZU).
Grrr... Better it should be done by PTF in the normal service stream rather than
burdening systems administrators with another responsibility. Linux got it
right:
just routine service.
-- gil
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