[tz] [PROPOSED] Remove some invented abbreviations in ‘europe’

[Tim Parenti]

On 28 Dec 2016 02:19, Paul Eggert wrote:
> Attached is a proposed patch to clean up ‘europe’ along those lines.

Further proposed commentary attached regarding the extra lines added to 
work around '%z'.

These cases have been sufficiently rare that I think it's worth 
documenting them as we go, so they're easier to find once we feel '%z' 
is sufficiently well-supported we can rip them out.

--
Tim Parenti

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From 668c48688e458dd611983a35ab8d5ee7d3f55c24 Mon Sep 17 00:00:00 2001
From: Tim Parenti <tim at timtimeonline.com>
Date: Wed, 4 Jan 2017 23:06:30 -0500
Subject: Add %z commentary for Portuguese Atlantic zones.

* europe (Atlantic/Azores, Atlantic/Madeira): Mention that several lines
are merely constructed to emulate zic %z.
---
 europe | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/europe b/europe
index c281449..17e0119 100644
--- a/europe
+++ b/europe
@@ -2194,6 +2194,23 @@ Zone Atlantic/Madeira	-1:07:36 -	LMT	1884        # Funchal
 			-1:00	Port	-01/+00	1966 Apr  3  2:00
 			 0:00	Port	WE%sT	1983 Sep 25  1:00s
 			 0:00	EU	WE%sT
+# From Tim Parenti (2017-01-04):
+# For the Portuguese Atlantic zones above, the transitions after 1942 (until
+# 1992 for Atlantic/Azores and until 1966 for Atlantic/Madeira) are constructed
+# to support representing Portugal's various DST schemes while zic %z is
+# relatively new and not widely supported.
+#
+# The last several lines of each can ultimately be replaced with the following:
+# For Atlantic/Azores...
+#			-2:00	Port	%z	1966 Apr  3  2:00
+#			-1:00	Port	%z	1983 Sep 25  1:00s
+#			-1:00	W-Eur	%z	1992 Sep 27  1:00s
+#			 0:00	EU	WE%sT	1993 Mar 28  1:00u
+#			-1:00	EU	%z
+# For Atlantic/Madeira...
+# 			-1:00	Port	%z	1966 Apr  3  2:00
+# 			 0:00	Port	WE%sT	1983 Sep 25  1:00s
+# 			 0:00	EU	WE%sT
 
 # Romania
 #
-- 
2.8.0