Paul G <p.gans...@gmail.com> added the comment:

This seems very useful to me. I very frequently advise people *against* using 
dateutil.parser (despite my conflict of interest as maintainer of dateutil) for 
well-known formats, but the problem frequently comes up of, "what should I do 
when I have date created by isoformat()?", to which there's no clean satisfying 
answer other than, "use dateutil.parser even though you know the format."

I think the strptime page that Mario linked to is evidence that the %z 
directive is *intended* to match against -HH:MM, and so that might be the most 
"standard" solution.

That said, I somewhat prefer the granularity of the GNU date extensions %z, %:z 
and %::z, since this allows downstream users to be stricter about what they are 
willing to accept. I think either approach is defensible, but that *something* 
should be done soon, preferably for the 3.7 release.

----------
nosy: +p-ganssle

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