Updating tzdata

IBM® AIX® supports two time zone formats: Portable Operating System Interface (POSIX) and Olson.

POSIX is the traditional format of setting the time zone and Olson is the latest, simple, easy to understand format.

This Olson time zone format maintains a database, which is a collaborative compilation of information about the world's time zones.

This database is a set of text files containing the rules and zone transitions organized continent-wise and is periodically updated and published by Internet Assigned Numbers Authority (IANA).

This information is in human readable format and can be used for compiling it into binary files using zone information compiler.

This article helps you to understand how to update the Olson time zone database on IBM AIX whenever the government announces any change to time zone boundaries, UTC offsets, and daylight saving rules.

The Olson time zone database maintains the history of the time zone and Daylight Saving Time (DST)-related changes in a binary file or each time zone under the /usr/share/lib/zoneinfo directory in AIX.

When a government changes a time zone offset or DST rule, these binaries need to updated with the latest information.

But most of the times, government announces the change in a short time, which leaves very less time for the customers to update their systems.

During such short time notices, instead of waiting for the interim fix process, customer can update the Olson database as mentioned below.

Note: The following update process is applicable from AIX version 7.200- and 7100- onwards. This zone recently announced that it ends DST on 29 October 2016 and not 21 October 2016 at .

Refer to the following demo: command gives a clear picture of DST change timing for the particular time zone.

For example, in Figure 1, the first two lines explain the scenario when daylight saving is enabled and the last two lines explain the scenario when it is disabled.

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My CentOS knowledge is a bit out of date, but you may need to also specify the timezone in /etc/sysconfig/clock. As a last-ditch effort, of course, you could chatter +i /etc/localtime. It is surprising that tzdata munges /etc/localtime though. Have you made it a symlink to /usr/share/zoneinfo/. ? Are you perhaps. 
12-Feb-2019 10:51
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Jan 15, 2014. This happens because there is a trigger on glibc-common for the tzdata package to run /usr/sbin/tzdata-update which copies timezone set in /etc/sysconfig/clock to /etc/localtime. If you didn't update your timezone in /etc/sysconfig/clock you'll find your server will revert to the old time zone which is annoying. 
12-Feb-2019 10:55
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As such, you may need from time to time to update this file to ensure the Junos devices continue to accurately reflect worldwide time zones and daylight savings time intervals. To update the IANA Time Zone Database, perform the following steps Importing and Installing Time. ftp org/tz# bin# get gz. 
12-Feb-2019 11:00
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The timezone packages contain the zdump utility, which allows you to show the tz information about any timezone that is listed in # rpm -ql timezone. Of interest to you would probably be the output of # zdump -v Europe/Minsk The timezone update released a week ago contains the updates of tzdata 2011j. 
12-Feb-2019 11:06
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Nov 4, 2011. The original patch for CM 3.1.2, 01.2.632.1-12514gz, included the 2006g version of tzdata. This patch is now obsolete. The newest patch for CM 3.1.2, 01.2.632.1-14809gz, contains the 2007h version of tzdata. The 2007h version contains additional updates over and above what was in 2006g. 
12-Feb-2019 11:11
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The easy way to update the timezone is to use sudo dpkg-reconfigure tzdata. But this isn't so easily scripted. If you want to set the timezone explicitly via a script e.g. for setting up a VM, here's a recipe Set a variable for the timezone you want, e.g. one of tz=Europe/London tz=America/Anchorage. 
12-Feb-2019 11:15
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Apr 18, 2017. OUTPUT java.home /opt/java6/jre java.vendor Hewlett-Packard version 1.6.0.12 Downloaded file to /var/tmp/tz.tmp_1/gz JRE tzdata version tzdata2016g tzupdater tool would update with tzdata version tzdata2016gEmbedded tzmappings data version tzdata2016gDownloaded file to. 
12-Feb-2019 11:19
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Updating tzdata introduction

Updating tzdata

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