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From: Isaac Dunham <ibid.ag@gmail.com>
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Subject: Re: strptime problems
Date: Thu, 8 May 2014 06:44:36 -0700
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On Thu, May 08, 2014 at 12:32:14AM -0400, Rich Felker wrote:
> It was raised somewhere (on IRC, I think) that strptime still has some
> failure paths where functionality is unimplemented. These should have
> been caught and fixed a long time ago, but they weren't, so I'd like
> to get it done now. However I'm not clear on what the behavior of
> strptime should be when reading "derived" fields that don't actually
> correspond to anything in the "struct tm". Should it just parse and
> ignore them, or should it somehow convert back? The week-based-year
> stuff is probably the biggest question but there are others too.

I'd say it shouuld convert back.
"%U %w %Y" is enough information to find the day referred to.

HTH,
Isaac Dunham