AIX

Originally posted by: Rowan

Due to Australia hosting the Commonwealth Games Daylight Savings has been extended
from the Sunday 26th March to Sunday 2nd April this year.
This off course means I need to update the TZ variable. I'd appreciate feedback as to if the below is correct to ensure the changes occurs on the new date.
Current TZ = EET-10EETDT,M10.5.0,M3.5.0
Proposed TZ = EET-10EETDT,M10.5.0,M4.1.0
I assume I then need to change it back after the date to be correct for the following year, I know HP-UX has a file where you can specify changes to be for a specific year only..

Originally posted by: KentPerrier

IBM should produce a patch to deal with this.

Originally posted by: SystemAdmin

I know that AIX 5.2 and AIX 5.3 have support for doing just this. Go to smitty - system environments - change/show date, time, timezone. There is an option for entering user specified values. You can set which timezone you are in and when the system enters/exits Daylight Saving Time. Set the values you want and boot.

I had to look into the same thing as Indiana is now going to support DST for the first time this fall.

-Aaron

Originally posted by: Rowan

With impeccable timing I recieved the answer by way of a AIX support bulletin -

Australian DST change for 2006

For systems using the Time Zone (TZ) variable to adjust for Daylight
Savings (DST), a manual adjustment may be needed to cover the changes made
by Australian Governments to Australian DST in 2006 to take account of the
Commonwealth Games. You should check whether your system is utilising
Daylight Savings Time (DST) and how this will affect your systems and
applications. If you do change the Time Zone (TZ) variable any changes made
to the time zone will NOT fully take effect until the next system boot.

Please review the TechNote "Managing the Time Zone Variable" which
discusses the implications of making changes available from
http://techsupport.services.ibm.com/server/aix.srchBroker

For example
For ACT, NSW, and VIC the TZ environment variable needs to change from
TZ=EET-10EETDT,M10.5.0,M3.5.0 - to - TZ=EET-10EETDT,M10.5.0,M4.1.0
Customers should contact their local Government office to verify the
start and stop rules for DST in their locality
Australia http://www.australia.gov.au/
New Zealand http://www.dia.govt.nz/
This change can be made with the chtz command, through smit 'smit
chtz_user' or by editing the /etc/environment file.
After making this change kill/stop/restart " cron " so that it will pick
up the new TZ when it is automatically restarted by init.
Other applications that rely on TZ would also need to be restarted.eg
users should log out and back in to pick up the change.
A reboot, while probably not essential, would ensure that all processes
pickup the change.