From mboxrd@z Thu Jan  1 00:00:00 1970
Subject: date -t vs rfc3339 i which is correct:
Date: Mon, 9 Dec 2019 21:55:57 -0500
From: sl@stanleylieber.com
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we have: 2018-01-30T09:40:58-0500

rfc seems to demand: 2018-01-30T09:40:58-05:00

can't tell if this is supposed to be valid both ways, or one (or the
other) way.

sl