RFC 2822 is already obsolete, and this part was somewhat fixed in RFC 5322. See Section 3.3 of that document, in that those old zone names are marked as obsolete, but allowed. Pete can say more if he wants. Eliot On 03.03.23 00:04, Tim Parenti via tz wrote:
On Thu, 2 Mar 2023 at 17:45, Paul Eggert via tz <tz@iana.org> wrote:
Whether the adjusted time in (say) New York would be abbreviated "EST" or "AST" or "EDT" is up to common practice.
[…]
At some point "EST" might become the best of the alternatives.
Worth considering that, if "EST" were to become standard for -04, it would require modifications to supported, but obsoleted, formats in RFC 2822 §4.3, which state:
EDT is semantically equivalent to -0400 EST is semantically equivalent to -0500 CDT is semantically equivalent to -0500 CST is semantically equivalent to -0600 MDT is semantically equivalent to -0600 MST is semantically equivalent to -0700 PDT is semantically equivalent to -0700 PST is semantically equivalent to -0800
-- Tim Parenti