--- a/make/data/tzdata/northamerica Mon Apr 09 13:35:19 2018 +0200
+++ b/make/data/tzdata/northamerica Mon Apr 09 04:43:03 2018 -0700
@@ -48,7 +48,7 @@
# in New York City (1869-10). His 1870 proposal was based on Washington, DC,
# but in 1872-05 he moved the proposed origin to Greenwich.
-# From Paul Eggert (2016-09-21):
+# From Paul Eggert (2018-03-20):
# Dowd's proposal left many details unresolved, such as where to draw
# lines between time zones. The key individual who made time zones
# work in the US was William Frederick Allen - railway engineer,
@@ -59,10 +59,9 @@
# to the General Time Convention on 1883-04-11, saying that his plan
# meant "local time would be practically abolished" - a plus for
# railway scheduling. By the next convention on 1883-10-11 nearly all
-# railroads had agreed and it took effect on 1883-11-18 at 12:00.
-# That Sunday was called the "day of two noons", as the eastern parts
-# of the new zones observed noon twice. Allen witnessed the
-# transition in New York City, writing:
+# railroads had agreed and it took effect on 1883-11-18. That Sunday
+# was called the "day of two noons", as some locations observed noon
+# twice. Allen witnessed the transition in New York City, writing:
#
# I heard the bells of St. Paul's strike on the old time. Four
# minutes later, obedient to the electrical signal from the Naval
@@ -447,8 +446,7 @@
# ...according to the Census Bureau, the largest city is Beulah (although
# it's commonly referred to as Beulah-Hazen, with Hazen being the next
# largest city in Mercer County). Google Maps places Beulah's city hall
-# at 47 degrees 15' 51" N, 101 degrees 46' 40" W, which yields an offset
-# of 6h47'07".
+# at 47° 15' 51" N, 101° 46' 40" W, which yields an offset of 6h47'07".
Zone America/North_Dakota/Beulah -6:47:07 - LMT 1883 Nov 18 12:12:53
-7:00 US M%sT 2010 Nov 7 2:00
@@ -481,7 +479,7 @@
# California, northern Idaho (Benewah, Bonner, Boundary, Clearwater,
# Kootenai, Latah, Lewis, Nez Perce, and Shoshone counties, Idaho county
# north of the Salmon River, and the towns of Burgdorf and Warren),
-# Nevada (except West Wendover), Oregon (except the northern 3/4 of
+# Nevada (except West Wendover), Oregon (except the northern ¾ of
# Malheur county), and Washington
# From Paul Eggert (2016-08-20):
@@ -979,6 +977,13 @@
-5:00 - EST 2006
-5:00 US E%sT
+# From Paul Eggert (2018-03-20):
+# The Louisville & Nashville Railroad's 1883-11-18 change occurred at
+# 10:00 old local time; train were supposed to come to a standstill
+# for precisely 18 minutes. See Bartky Fig. 1 (page 50). It is not
+# clear how this matched civil time in Louisville, so for now continue
+# to assume Louisville switched at noon new local time, like New York.
+#
# Part of Kentucky left its clocks alone in 1974.
# This also includes Clark, Floyd, and Harrison counties in Indiana.
# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
@@ -3287,8 +3292,8 @@
# http://www.jamaicaobserver.com/columns/The-politician-in-all-of-us_17573647
#
# Zone NAME GMTOFF RULES FORMAT [UNTIL]
-Zone America/Jamaica -5:07:11 - LMT 1890 # Kingston
- -5:07:11 - KMT 1912 Feb # Kingston Mean Time
+Zone America/Jamaica -5:07:10 - LMT 1890 # Kingston
+ -5:07:10 - KMT 1912 Feb # Kingston Mean Time
-5:00 - EST 1974
-5:00 US E%sT 1984
-5:00 - EST
@@ -3438,7 +3443,7 @@
#
# Zone NAME GMTOFF RULES FORMAT [UNTIL]
Zone America/Grand_Turk -4:44:32 - LMT 1890
- -5:07:11 - KMT 1912 Feb # Kingston Mean Time
+ -5:07:10 - KMT 1912 Feb # Kingston Mean Time
-5:00 - EST 1979
-5:00 US E%sT 2015 Nov Sun>=1 2:00
-4:00 - AST 2018 Mar 11 3:00