[tz] Fwd: Bulletin C number 58

Brian Inglis Brian.Inglis at SystematicSw.ab.ca
Mon Jul 29 23:03:46 UTC 2019

On 2019-07-29 08:03, Judah Levine via tz wrote:
>    I have removed the trailing spaces that you noticed and the new files
> are now posted at both ftp locations. With all due respect and with no
> offense intended, I suggest that software that is sensitive to trailing
> whitespace should be re-considered.
>    The comment lines are intended to be helpful for any poor soul who is
> not familiar with the various time formats and the definition of leap
> seconds. I consider that stuff to be helpful explanations and not data.
> The point of making them comments is that they could be easily ignored
> by the usual software that parses scripts and by users who understand
> all of the strange and wondrous details of UTC.
>    I designed the two "special" comment lines so that they could be
> found by reading the first two characters on every line in the file
> without parsing every line. Also, they would not have to be at any
> special line number in the file. I did not invent this idea -- UNIX
> scripts use the same method to identify the shell. For example, a script
> that did not care about the checksum could ignore that value without any
> special processing.
>    I invented the file format in the dark ages based on what I thought
> would be useful at the time. I will *consider* improvements or changes
> with the understanding that the file is used on many different and
> incompatible operating systems. Any "improvement" that breaks this
> requirement is unlikely to be useful.

"Be liberal in what you accept, and conservative in what you send"
	-- RFC 1122, Robustness Principle: Postel's Law, Jon Postel

Git check-in hooks for such issues should either be warnings, or configured to
ignore all upstream sources: you should always be able to check in upstream
sources as is.

Take care. Thanks, Brian Inglis, Calgary, Alberta, Canada

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