On Mon, 18 May 2020 01:58:01 +0000, Mike Schwab wrote:

>Yep.  You almost need a country code, and for multi zone countries a
>zone indicator.  Especially since a shared time zone might have
>different DST / ST switch dates in different countries.
> 
And it's up to the recipient to unwind the process?

That's the reason that SMTP date headers specify simply "+/-hhmm"
(Which might be +0000 for UTC.)

Do you want to know the physical time the message originated,
or the solar illumination at that point in spacetime?

Otherwise, the Truth (which z/OS shuns) is:
    https://www.iana.org/time-zones

>On Sun, May 17, 2020 at 9:03 PM Paul Gilmartin
>> >
>> Beware of ambiguity.  AST is both Arabia Standard Time and Atlantic Standard 
>> Time,
>>     https://en.wikipedia.org/wiki/List_of_time_zone_abbreviations
>>
>> ... and I hadn't gotten through the "A"s yet.

-- gil

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