Hi:
> Well it looks like complicated on HP system for the time zone. I didn;t realise that we do not change the value of TZ but have to modify the file /usr/lib/tztab instead.
It isn't complicated on HP-UX at all. In fact, I find it simplier than Linux or AIX. You can set the TZ variable in your login '.profile' or set it system-wide in '/etc/TIMEZONE' (which in turn, will be sourced (read) by '/etc/profile' during login).
The *RULES* (definitions for a timezone) are what are held in '/usr/lib/tztab'. You can define your own if necessary simply by adding stanzas as documented in the manpages for 'tztab(4)'. Patches are usually released in plenty of time to accomodate world-wide TZ rule changes.
Moreoever, the HP-UX '/usr/lib/tztab' is an ASCII file that you edit directly. There is no "de-compilation" and "recompilation from a binary to an ASCII and from an ASCII to a binary format as in AIX.
> On ibm aix for example you jsut modify the TZ variable to the good one...So I was confused.
As you see from the above, this is really similar when you are choosing among established rules. In HP-UX, you modify either your '.profile' or '/etc/TIMEZONE'. In AIX, you modify '/etc/environment' (manually or with AIX's 'chtz').
> I have a question: If we install the latest patch of Timezone do this come with the new file version of /usr/lib/tztab or do I need to modify it ?
NO, the recent patches accomodate universal, standard definitions. To find the latest patch, search the ITRC Patch database with the keyword "tztab". For example, PHCO_36098 delivers the latest 'tztab' for 11.23.
When you modify a global setting or add a new ruleset, restart any long running processes like 'cron' and databases. THis allows them to re-cache the new rules. While a reboot is not strictly necessary it is the cleanest way to obtain consistent, system-wide process definition.
Please also see:
http://forums1.itrc.hp.com/service/forums/helptips.do?#28Regards!
...JRF...
