FW: Revision History of TZ database

Nathan Stratton Treadway nathanst at ontko.com
Tue Apr 28 17:41:46 UTC 2009

On Thu, Mar 26, 2009 at 16:22:41 -0400, Olson, Arthur David (NIH/NCI) [E] wrote:

> Where can I find revision history of changes that has happened in TZ
> database across given two versions? For example, I would like to know
> what all changes happened from TZ version 2007g to 2008c. I will
> appreciate any pointers/help regarding this.

The changelog for the Ubuntu "tzdata" package includes some mentions of
the rule changes that are part of various versions of the package, going
back through 2006 (when the package was first created).


The descriptions of rule changes that were made in the upstream database
are mixed in with descriptions of Ubuntu-specific rule patches as well
as discussions of other (non-timezone-rule) changes made to the package,
but it's still probably easier to find changes of interest in this
document than by scanning through the whole of the tz mailing list
archives or trying to "diff" the database files.  (Search the page for
phrases such as "new upstream" and "new timezone data".)

(The link above will only show the latest version of the changelog while
"karmic" release is still active; eventually you will need to go back to
the "overview" page at
and follow the links to package versions that are found in newer
releases of Ubuntu.)

This search for a revision history comes up on the tz list
periodically, and personally I have also had occasions where I wished
there was some single document that I could just skim through to
identify exactly which release of the rules database include some
particular change.

If ADO (or whoever) were interested in maintaining this as a "changelog"
file within the tzdata distribution, I'd be willing to compile a list of
changes from tzdata releases over the past year or two, to get the ball

Alternatively, it might work well to do a community-maintained
release history wiki page, if there were a suitable wiki somewhere to
host it.


Nathan Stratton Treadway  -  nathanst at ontko.com  -  Mid-Atlantic region
Ray Ontko & Co.  -  Software consulting services  -   http://www.ontko.com/
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