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Re: [Patch] BZ#14080: Fix daylight time change for the US
> Roland McGrath <roland@hack.frob.com>
> The original 1003.1-1988 had wording that the default when no rule was
> specified was to follow US law. In the 1003.1-2008 text I can find no
> explanation whatsoever about what the behavior should be when no rule
> is specified, though it still indicates that the rule portion of the
> string is optional. It would be good if someone could submit a
> request for clarification to the standard so it's unambiguous.
I dug out my 1988 book, and there is no specification calling for US
law; US law is mentioned in the Rationale in passing as something
that the format accommodates.
In fact, the stance (then and now) is that if there is no rule specified,
the implementation gets to decide how to handle the rule.
(your friendly Standards guy)