How To Disable DayLight Saving

[tahirkhalil]

Hi All !

While installing the Solaris 9 on a Sun box - we have selected the time zone Asia, Karachi - which has DayLight setting active. In our Country now DST is disabled and no more applicable - but the operating system still changes the time in April & I think in September. How can I disable the DST setting?

 

[KenCunningham]

You really need to find out whether Sun has issued a patch for the zoneinfo file to modify the appropriate settings for your location.

 

[tahirkhalil]

Hi !

Thanks - but this is happening with Solaris 9 - the zone information database contains the settings for DST --

 

[KenCunningham]

That's what I thought. However, unless Sun know about the change and have issued a patch, I can't think of another way of doing this. Others might know differently of course!!

 

[crasho2001]

Hi,

According to /usr/share/lib/zoneinfo/src/asia file or
zdump -v Asia/Karachi, it seems there is no day light saving for Karachi. My solaris release is Solaris 9 9/04 s9s_u7wos_09 SPARC.

Below example was taken from rule EU. We changed the lines below from europe file to fix DST time according to EET.

Rule EU 1981 max - Mar lastSun 1:00 1:00 S
Rule EU 1996 max - Oct lastSun 2:00 0 -

If it is easy to try ,you can add following line to asia file below to Asia/Karachi rule.I recommend that copy asia file to another place.

Rule Asia/Karachi 2004 max - Mar lastSun 1:00 0 -
You should compile asia file with zic command.
zic asia.
Than try again zdump -v Asia/Karachi. Actual effect needs reboot.

 

[KenCunningham]

Told you so ;-)

 

[tahirkhalil]

I have the following lines with me:

# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
Rule Pakistan 2002 max - Apr Sun>=2 0:00 1:00 S
Rule Pakistan 2002 max - Oct 15 0:00 0 -
# Zone NAME GMTOFF RULES FORMAT [UNTIL]
Zone Asia/Karachi 4:28:12 - LMT 1907
5:30 - IST 1942 Sep
5:30 1:00 IST 1945 Oct 15
5:30 - IST 1951 Sep 30
5:00 - KART 1971 Mar 26 # Karachi Time

and the zdump says its on :

Asia/Karachi Sat Apr 2 18:59:59 2005 UTC = Sat Apr 2 23:59:59 2005 PKT isdst=0
Asia/Karachi Sat Apr 2 19:00:00 2005 UTC = Sun Apr 3 01:00:00 2005 PKST isdst=1
Asia/Karachi Fri Oct 14 17:59:59 2005 UTC = Fri Oct 14 23:59:59 2005 PKST isdst=1
Asia/Karachi Fri Oct 14 18:00:00 2005 UTC = Fri Oct 14 23:00:00 2005 PKT isdst=0

5:00 Pakistan PK%sT # Pakistan Time

I think I could try the change you suggest & will update.