[tz] Removing systemv, pacificnew, Rule TYPEs, zic -y

Michael H Deckers michael.h.deckers at googlemail.com
Sun Oct 4 19:30:27 UTC 2020

On 2020-05-14 01:54, Tim Parenti wrote:
> I noticed recently that the systemv file, which adapted a subset of North
> American zones with limited rulesets to old versions of System V, has had
> all its once-useful bits commented out since 2005p.  Looking back at list
> archives, even discussion at the time argued that the file wasn't really
> needed then.  The attached proposed patch 0001 removes this obsolete file
> and its references.


    But if you do that you must also modify the goal of tzdb
    as stated in the theory file: that the tzdb data
      "record the history and predicted future of all
       computer-based clocks that track civil time."

    SystemV clocks have been "computer-based clocks that
    track civil time", and they are no longer "recorded".
    So, apparently, you no longer want to record facts about
    "all computer-based clocks" tracking civil time.

    Actually, with very few exceptions, tzdb currently records the
    current state, the predicted future, and a selected part of the
    history, of civil time scales (not of computer clocks) as
    far as they are known; for the use in computer clocks, with
    special support for POSIX computer clocks.

    The dst bit is a special attribute for POSIX, while other
    attributes required by other computer systems (eg, the
    offset to standard time and the summer time indicator) are
    currently not supported by tzdb.

    Michael Deckers.

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