> On Oct 3, 2017, at 11:07 PM, Ørjan Johansen <oer...@nvg.ntnu.no> wrote:
> 
> On Tue, 3 Oct 2017, Owen Jacobson wrote:
> 
>>> On Oct 3, 2017, at 10:49 PM, Ørjan Johansen <oer...@nvg.ntnu.no> wrote:
>>> 
>>> "The Date: header of an emailed public message constitutes a self-ratifying 
>>> claim that the message was sent at the indicated time.”
>> 
>> Far too powerful, given how difficult it can be for some clients to display 
>> anomalous Date: headers.
> 
> "A Date: header in standard-conforming format", then?
> 
> I guess that won't do either, given how flexible standard formats are and how 
> stupid software is.
> 
> "A Date: email header in near-universally supported format".  Nailed it.

It’s not the format that’s the problem. Many clients display the date a message 
was received, not the Date: of the message itself, when showing dates in 
message lists. Mine (Mail.app, macOS Sierra, up-to-date on patches) does this.

-o

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