From mboxrd@z Thu Jan  1 00:00:00 1970
From: thunk2@arcor.de (Thomas Plass)
Subject: Re: parsing time strings from properties
Date: Sun, 22 Sep 2019 12:10:46 +0200
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In-Reply-To: Your message of Saturday, September 21 2019 16:27:33
 (ID: <CAN_Dec8MJLLQMdOVPxM9bU44CVY0VJF8j=m5VEoXc_numQXy9A@mail.gmail.com>).
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To: Matt Price <moptop99@gmail.com>
Cc: Org Mode <emacs-orgmode@gnu.org>

Hi,

Matt Price wrote at 16:27 on September 21, 2019:
:=20
: :DUE=5FAT: 2019-09-26
:=20
: ...
:
: I'm wondering though how hard
: it would be to get the current time zone -- or the time zone that the=
 course is taught in -- from
: emacs, and construct the string from that value.=A0

This'll return the offset suffix (if that's what you want) when
executed in your local time zone (presumably "-04:00"):

(defun Price/local-time-offset-from-iso-date (y-m-d)
  (let* ((ymd (mapcar (lambda (s) (string-to-number s)) (split-string y=
-m-d "-")))
         (offsecs (nth 8
                       (decode-time
                        (apply #'encode-time
                               (list 59 59 23 (nth 2 ymd) (nth 1 ymd) (=
nth 0 ymd)))))))
    (format "%s%02d:%02d"
            (if (> offsecs 0) "+" "-")
            (/ offsecs 3600)
            (% offsecs 3600))))

On Unix, this'll always work.  On Windows, it works most of the time,
but may fail in the weeks around switches from and to daylight saving.

Thomas