DST 2007 Changes

Changes made to Daylight Savings Time for this year mean that all systems need to be updated with the latest timezone information.

Supported Linux Distributions

• Centos 3: Patched for about a year

• Centos 4: Patched for about a year

• Fedora Core 6: Patched since release

No Longer Supported Distributions

• Red Hat Linux 7.3: unpatched, no official patch available

• Red Hat Linux 9: unpatched, no official patch available

• Fedora Core 2: unpatched, no official patch available

• Fedora Core 4: patched

Checking Your Systems

The ones that have been patched should have been automatically applied to a system. However, if you've disabled the automatic patching mechanism you can verify that you are patched and ready by running a few commands:

Run all of these as root:

1. yum update tzdata

2. /usr/sbin/tzdata-update

3. /usr/sbin/zdump -v /etc/localtime | grep 2007

The output of the last one should be:

/etc/localtime  Sun Mar 11 06:59:59 2007 UTC = Sun Mar 11 01:59:59 2007 EST isdst=0 gmtoff=-18000
/etc/localtime  Sun Mar 11 07:00:00 2007 UTC = Sun Mar 11 03:00:00 2007 EDT isdst=1 gmtoff=-14400
/etc/localtime  Sun Nov  4 05:59:59 2007 UTC = Sun Nov  4 01:59:59 2007 EDT isdst=1 gmtoff=-14400
/etc/localtime  Sun Nov  4 06:00:00 2007 UTC = Sun Nov  4 01:00:00 2007 EST isdst=0 gmtoff=-18000

If the output says 'April' or 'October' anywhere on it then the system is NOT properly patched.

People with questions about DST patching on their linux systems can email linux@linux.duke.edu or contact the help desk.

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CategoryDistro