[tz] Norfolk Island

[Paul Eggert]

Tim Parenti wrote:
> See attached proposed patch to implement the Norfolk Island change.

Great minds think alike; I had already prepared the attached patch, which is 
quiter similar to your proposal for 2015 on, and adds a DST interval in 1974/5 
which seems to be reasonably well attested.

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From b7aa4806bc4268427f4e8e20ad37be1dc80fb8cb Mon Sep 17 00:00:00 2001
From: Paul Eggert <eggert at cs.ucla.edu>
Date: Wed, 23 Sep 2015 22:44:23 -0700
Subject: [PATCH] Norfolk moves from +1130 to +1100 on 2015-10-04 at 02:00
 local time.

Also, it observed DST from 1974-10-27 02:00 to 1975-03-02 02:00.
* australasia (Pacific/Norfolk): Implement this.
* NEWS: Document this.
---
 NEWS        |  7 +++++++
 australasia | 19 ++++++++++++++++++-
 2 files changed, 25 insertions(+), 1 deletion(-)

diff --git a/NEWS b/NEWS
index e2872c0..ead09c5 100644
--- a/NEWS
+++ b/NEWS
@@ -7,9 +7,16 @@ Unreleased, experimental changes
     Turkey's 2015 fall-back transition is scheduled for Nov. 8, not Oct. 25.
     (Thanks to Fatih.)
 
+    Norfolk moves from +1130 to +1100 on 2015-10-04 at 02:00 local time.
+    (Thanks to Alexander Krivenyshev.)
+
     Fiji's 2016 fall-back transition is scheduled for January 17, not 24.
     (Thanks to Ken Rylander.)
 
+  Changes affecting past time stamps
+
+    Norfolk observed DST from 1974-10-27 02:00 to 1975-03-02 02:00.
+
   Changes affecting code
 
     localtime no longer mishandles America/Anchorage after 2037.
diff --git a/australasia b/australasia
index c274f2e..5c272db 100644
--- a/australasia
+++ b/australasia
@@ -517,7 +517,10 @@ Zone	Pacific/Niue	-11:19:40 -	LMT	1901        # Alofi
 # Zone	NAME		GMTOFF	RULES	FORMAT	[UNTIL]
 Zone	Pacific/Norfolk	11:11:52 -	LMT	1901 # Kingston
 			11:12	-	NMT	1951 # Norfolk Mean Time
-			11:30	-	NFT	# Norfolk Time
+			11:30	-	NFT	1974 Oct 27 02:00 # Norfolk T.
+			11:30	1:00	NFST	1975 Mar  2 02:00
+			11:30	-	NFT	2015 Oct  4 02:00
+			11:00	-	NFT
 
 # Palau (Belau)
 # Zone	NAME		GMTOFF	RULES	FORMAT	[UNTIL]
@@ -1557,6 +1560,20 @@ Zone	Pacific/Wallis	12:15:20 -	LMT	1901
 # started DST on June 3.  Possibly DST was observed other years
 # in Midway, but we have no record of it.
 
+# Norfolk
+
+# From Alexander Krivenyshev (2015-09-23):
+# Norfolk Island will change ... from +1130 to +1100:
+# https://www.comlaw.gov.au/Details/F2015L01483/Explanatory%20Statement/Text
+# ... at 12.30 am (by legal time in New South Wales) on 4 October 2015.
+# http://www.norfolkisland.gov.nf/nia/MediaRelease/Media%20Release%20Norfolk%20Island%20Standard%20Time%20Change.pdf
+
+# From Paul Eggert (2015-09-23):
+# Transitions before 2015 are from timeanddate.com, which consulted
+# the Norfolk Island Museum and the Australian Bureau of Meteorology's
+# Norfolk Island station, and found no record of Norfolk observing DST
+# other than in 1974/5.  See:
+# http://www.timeanddate.com/time/australia/norfolk-island.html
 
 # Pitcairn
 
-- 
2.1.0