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HP Tru64 UNIX - Venezuelan Time Zone Change

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 Advisory Information
 

LAST UPDATE: 2007-12-06

DESCRIPTION

Venezuela is scheduled to implement a time zone change from GMT-4 to GMT-4:30 at 03:00 local time on 9 December 2007.

The steps listed in the Resolution section of this advisory provide details on how to implement the change manually.

 
SCOPE

The following versions are affected:

  • HP Tru64 UNIX V5.1B-4
  • HP Tru64 UNIX V5.1B-3
 
RESOLUTION

Follow these steps to manually implement the time zone change.

  1. cd to /etc/zoneinfo/sources
    # cd /etc/zoneinfo/sources
     
  2. Make a backup of the original southamerica file:
    # cp southamerica southamerica.ORIG
     
  3. Edit the southamerica file. Add the following information in the Venezuela section:
  • Under the [UNTIL] column after -4:00 - VET, add 2007 Dec 9 03:00
  • In the next row under the GMTOFF column, add -4:30
  • Under the RULES column, add -
  • Under FORMAT column, add VET

The edited file should look like this:

# Venezuela
# Zone NAME GMTOFF RULES FORMAT [UNTIL]
Zone America/Caracas -4:27:44 - LMT 1890
            -4:27:40 - CMT 1912 Feb 12 # Caracas Mean Time?
            -4:30 - VET 1965 # Venezuela Time
            -4:00 - VET 2007 Dec 9 03:00
            -4:30 - VET

  1. Run the zic command on the southamerica file:
    # /usr/bin/zic /etc/zoneinfo/sources/southamerica
     
  2. Run the zdump command to verify the changes. The zdump results should appear as follows:

# zdump -v ./America/Caracas | grep 2007
./America/Caracas Sun Dec 9 06:59:59 2007 GMT = Sun Dec 9 02:59:59 2007 VET isdst=0 gmtoff=-14400
./America/Caracas Sun Dec 9 07:00:00 2007 GMT = Sun Dec 9 02:30:00 2007 VET isdst=0 gmtoff=-16200

Users should verify the correct date and time. The zdump output indicates that on Sunday Dec 9 2007 immediately after 02:59:59 the time changes to 02:30:00, as expected.