topic Re: Time Zone matter in Operating System - HP-UX

Time Zone matter

yc_2 — Mon, 27 Feb 2006 22:17:19 GMT

Hi,

When date comand is issued, the output is as follows:

Tue Feb 28 11:01:07 SST 2006

The setting in /etc/TIMEZONE is as follows:
TZ=SST-8
export TZ

Some queries:
(1) What is the meaning of SST?
(2) Can SST change to SGT as the server is located in Singpaore?

Appreciate any pointer.

Re: Time Zone matter

Bill Hassell — Mon, 27 Feb 2006 23:11:21 GMT

HP-UX is unique in that the timezone can be completely customized with the TZ variable and the /usr/lib/tztab file.

When you first login, /etc/profile sources the /etc/TIMEZONE file to set TZ for all users. The SST portion of the TZ variable is an arbitrary tag, usually symbolic of the actual timezone and the -8 is the number of hours east of UTC (also known as Greenwich or Zulu) timezone. See the man page for: environ and tztab for details.

You can search through the file /usr/lib/tztab to locate SGT and then edit /etc/TIMEZONE. Now all new logins will have the new timezone value.

Re: Time Zone matter

Arunvijai_4 — Mon, 27 Feb 2006 23:17:21 GMT

Hello,

(1) What is the meaning of SST?

Singapore Standard Time (SST). You can find more information at http://www.singaporestandardtime.org.sg/

(2) Can SST change to SGT as the server is located in Singpaore?

You can leave SST unchanged since it refers to Singapore time.

-Arun

Re: Time Zone matter

Yogeeraj_1 — Mon, 27 Feb 2006 23:17:58 GMT

hi,

if you want to modify the timezone, you can use the following command:

set_parms timezone

see man set_parms for more details.

kind regards
yogeeraj

Re: Time Zone matter

Rajeev Shukla — Mon, 27 Feb 2006 23:18:01 GMT

(1) SST is not by default defined in tztab file in /usr/lib, it is something you can define yourself, or can be anything but its the -8 which matters. Which is the timedifference from UTC/GMT.
(2) as said you could change SST to SGT or (SST in your case i guess means Singapore standard time, which someone must have made before) even PST(pacific standard time) but keep the -8 same otherwise you'll change the time on your server.

Re: Time Zone matter

Yogeeraj_1 — Mon, 27 Feb 2006 23:22:14 GMT

hi again,

if you use set_parms, the following steps will follow:
=====================================
# set_parms timezone
_______________________________________________________________________________

The following procedure enables you to set the time zone.

Select your location from the following list:

1) North America or Hawaii
2) Central America
3) South America
4) Europe
5) Africa
6) Asia
7) Australia, New Zealand
_______________________________________________________________________________

Enter the number for your location (1-7) then press [Enter] 6
_______________________________________________________________________________

Select your time zone from the following list:

1) Saudi Arabia, Syria | 6) Phillipines, Hong Kong, Eastern Chi
na, Taiwan
|
2) India | 7) Japan
|
3) Pakistan | 8) Korea
|
4) Thailand | 9) Unlisted time zone
|
5) Singapore | 10) Previous menu
_______________________________________________________________________________

Enter the number for your time zone (1 - 10), then press [Enter] 5

_______________________________________________________________________________

You have selected:

Singapore (SST-8).
_______________________________________________________________________________

Is this correct?

Press [y] for yes or [n] for no, then press [Enter]
=================================

Singapore is already: Singapore (SST-8).

no changes required then

kind regards
yogeeraj

Re: Time Zone matter

yc_2 — Tue, 28 Feb 2006 02:01:26 GMT

Thanks for the replies.

One more question:
I modified /etc/TIMEZONE setting to the following in one of the test server:

TZ=SGT-8
export TZ

I did a reboot and now when date command is issued, the SST has changed to SGT.

Will there be any implication?

Re: Time Zone matter

Bill Hassell — Tue, 28 Feb 2006 07:21:24 GMT

No, there is no implication. As mentioned, SST or SGT are for appearance, but the -8 is what counts in setting the local time. You can even create your own timezone name such as LEONG-8. The primary purpose for the tztab file is to store Daylight Saving rules. If you don't need any of these rules, your setting of SGT-8 is just fine.