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@@ -114,37 +114,14 @@
 # Shanks says that DST was called "War Time" in the US in 1918 and 1919.
 # However, DST was imposed by the Standard Time Act of 1918, which
 # was the first nationwide legal time standard, and apparently
 # time was just called "Standard Time" or "Daylight Saving Time".
 
-# From Paul Eggert (2019-06-04):
-# Here is the legal basis for the US federal rules.
-# * Public Law 65-106 (1918-03-19) implemented standard and daylight saving
-#   time for the first time across the US, springing forward on March's last
-#   Sunday and falling back on October's last Sunday.
-#   https://www.loc.gov/law/help/statutes-at-large/65th-congress/session-2/c65s2ch24.pdf
-# * Public Law 66-40 (1919-08-20) repealed DST on October 1919's last Sunday.
-#   https://www.loc.gov/law/help/statutes-at-large/66th-congress/session-1/c66s1ch51.pdf
-# * Public Law 77-403 (1942-01-20) started wartime DST on 1942-02-09.
-#   https://www.loc.gov/law/help/statutes-at-large/77th-congress/session-2/c77s2ch7.pdf
-# * Public Law 79-187 (1945-09-25) ended wartime DST on 1945-09-30.
-#   https://www.loc.gov/law/help/statutes-at-large/79th-congress/session-1/c79s1ch388.pdf
-# * Public Law 89-387 (1966-04-13) reinstituted a national standard for DST,
-#   from April's last Sunday to October's last Sunday, effective 1967.
-#   https://www.govinfo.gov/content/pkg/STATUTE-80/pdf/STATUTE-80-Pg107.pdf
-# * Public Law 93-182 (1973-12-15) moved the 1974 spring-forward to 01-06.
-#   https://www.govinfo.gov/content/pkg/STATUTE-87/pdf/STATUTE-87-Pg707.pdf
-# * Public Law 93-434 (1974-10-05) moved the 1975 spring-forward to
-#   February's last Sunday.
-#   https://www.govinfo.gov/content/pkg/STATUTE-88/pdf/STATUTE-88-Pg1209.pdf
-# * Public Law 99-359 (1986-07-08) moved the spring-forward to April's first
-#   Sunday.
-#   https://www.govinfo.gov/content/pkg/STATUTE-100/pdf/STATUTE-100-Pg764.pdf
-# * Public Law 109-58 (2005-08-08), effective 2007, moved the spring-forward
-#   to March's second Sunday and the fall-back to November's first Sunday.
-#   https://www.govinfo.gov/content/pkg/PLAW-109publ58/pdf/PLAW-109publ58.pdf
-# All transitions are at 02:00 local time.
+# From Arthur David Olson:
+# US Daylight Saving Time ended on the last Sunday of *October* in 1974.
+# See, for example, the front page of the Saturday, 1974-10-26
+# and Sunday, 1974-10-27 editions of the Washington Post.
 
 # From Arthur David Olson:
 # Before the Uniform Time Act of 1966 took effect in 1967, observance of
 # Daylight Saving Time in the US was by local option, except during wartime.
 

@@ -196,15 +173,15 @@
 # Rule  NAME    FROM    TO      TYPE    IN      ON      AT      SAVE    LETTER/S
 Rule    US      1918    1919    -       Mar     lastSun 2:00    1:00    D
 Rule    US      1918    1919    -       Oct     lastSun 2:00    0       S
 Rule    US      1942    only    -       Feb     9       2:00    1:00    W # War
 Rule    US      1945    only    -       Aug     14      23:00u  1:00    P # Peace
-Rule    US      1945    only    -       Sep     30      2:00    0       S
+Rule    US      1945    only    -       Sep     lastSun 2:00    0       S
 Rule    US      1967    2006    -       Oct     lastSun 2:00    0       S
 Rule    US      1967    1973    -       Apr     lastSun 2:00    1:00    D
 Rule    US      1974    only    -       Jan     6       2:00    1:00    D
-Rule    US      1975    only    -       Feb     lastSun 2:00    1:00    D
+Rule    US      1975    only    -       Feb     23      2:00    1:00    D
 Rule    US      1976    1986    -       Apr     lastSun 2:00    1:00    D
 Rule    US      1987    2006    -       Apr     Sun>=1  2:00    1:00    D
 Rule    US      2007    max     -       Mar     Sun>=8  2:00    1:00    D
 Rule    US      2007    max     -       Nov     Sun>=1  2:00    0       S
 

@@ -217,11 +194,11 @@
 # a particular place changes whether it observes DST.
 # We put these specifications here in the northamerica file both to
 # increase the chances that they'll actually get compiled and to
 # avoid the need to duplicate the US rules in another file.
 
-# Zone  NAME            STDOFF  RULES   FORMAT  [UNTIL]
+# Zone  NAME            GMTOFF  RULES   FORMAT  [UNTIL]
 Zone    EST              -5:00  -       EST
 Zone    MST              -7:00  -       MST
 Zone    HST             -10:00  -       HST
 Zone    EST5EDT          -5:00  US      E%sT
 Zone    CST6CDT          -6:00  US      C%sT

@@ -374,11 +351,11 @@
 Rule    NYC     1920    only    -       Mar     lastSun 2:00    1:00    D
 Rule    NYC     1920    only    -       Oct     lastSun 2:00    0       S
 Rule    NYC     1921    1966    -       Apr     lastSun 2:00    1:00    D
 Rule    NYC     1921    1954    -       Sep     lastSun 2:00    0       S
 Rule    NYC     1955    1966    -       Oct     lastSun 2:00    0       S
-# Zone  NAME            STDOFF  RULES   FORMAT  [UNTIL]
+# Zone  NAME            GMTOFF  RULES   FORMAT  [UNTIL]
 Zone America/New_York   -4:56:02 -      LMT     1883 Nov 18 12:03:58
                         -5:00   US      E%sT    1920
                         -5:00   NYC     E%sT    1942
                         -5:00   US      E%sT    1946
                         -5:00   NYC     E%sT    1967

@@ -434,11 +411,11 @@
 Rule    Chicago 1920    1921    -       Oct     lastSun 2:00    0       S
 Rule    Chicago 1921    only    -       Mar     lastSun 2:00    1:00    D
 Rule    Chicago 1922    1966    -       Apr     lastSun 2:00    1:00    D
 Rule    Chicago 1922    1954    -       Sep     lastSun 2:00    0       S
 Rule    Chicago 1955    1966    -       Oct     lastSun 2:00    0       S
-# Zone  NAME            STDOFF  RULES   FORMAT  [UNTIL]
+# Zone  NAME            GMTOFF  RULES   FORMAT  [UNTIL]
 Zone America/Chicago    -5:50:36 -      LMT     1883 Nov 18 12:09:24
                         -6:00   US      C%sT    1920
                         -6:00   Chicago C%sT    1936 Mar  1  2:00
                         -5:00   -       EST     1936 Nov 15  2:00
                         -6:00   Chicago C%sT    1942

@@ -502,11 +479,11 @@
 Rule    Denver  1920    1921    -       Mar     lastSun 2:00    1:00    D
 Rule    Denver  1920    only    -       Oct     lastSun 2:00    0       S
 Rule    Denver  1921    only    -       May     22      2:00    0       S
 Rule    Denver  1965    1966    -       Apr     lastSun 2:00    1:00    D
 Rule    Denver  1965    1966    -       Oct     lastSun 2:00    0       S
-# Zone  NAME            STDOFF  RULES   FORMAT  [UNTIL]
+# Zone  NAME            GMTOFF  RULES   FORMAT  [UNTIL]
 Zone America/Denver     -6:59:56 -      LMT     1883 Nov 18 12:00:04
                         -7:00   US      M%sT    1920
                         -7:00   Denver  M%sT    1942
                         -7:00   US      M%sT    1946
                         -7:00   Denver  M%sT    1967

@@ -555,11 +532,11 @@
 Rule    CA      1948    only    -       Mar     14      2:01    1:00    D
 Rule    CA      1949    only    -       Jan      1      2:00    0       S
 Rule    CA      1950    1966    -       Apr     lastSun 1:00    1:00    D
 Rule    CA      1950    1961    -       Sep     lastSun 2:00    0       S
 Rule    CA      1962    1966    -       Oct     lastSun 2:00    0       S
-# Zone  NAME            STDOFF  RULES   FORMAT  [UNTIL]
+# Zone  NAME            GMTOFF  RULES   FORMAT  [UNTIL]
 Zone America/Los_Angeles -7:52:58 -     LMT     1883 Nov 18 12:07:02
                         -8:00   US      P%sT    1946
                         -8:00   CA      P%sT    1967
                         -8:00   US      P%sT
 

@@ -643,31 +620,11 @@
 # It seems Metlakatla did go off PST on Sunday, November 1, changing
 # their time to AKST and are going to follow Alaska's DST, switching
 # between AKST and AKDT from now on....
 # https://www.krbd.org/2015/10/30/annette-island-times-they-are-a-changing/
 
-# From Ryan Stanley (2018-11-06):
-# The Metlakatla community in Alaska has decided not to change its
-# clock back an hour starting on November 4th, 2018 (day before yesterday).
-# They will be gmtoff=-28800 year-round.
-# https://www.facebook.com/141055983004923/photos/pb.141055983004923.-2207520000.1541465673./569081370202380/
-
-# From Paul Eggert (2018-12-16):
-# In a 2018-12-11 special election, Metlakatla voted to go back to
-# Alaska time (including daylight saving time) starting next year.
-# https://www.krbd.org/2018/12/12/metlakatla-to-follow-alaska-standard-time-allow-liquor-sales/
-#
-# From Ryan Stanley (2019-01-11):
-# The community will be changing back on the 20th of this month...
-# From Tim Parenti (2019-01-11):
-# Per an announcement on the Metlakatla community's official Facebook page, the
-# "fall back" will be on Sunday 2019-01-20 at 02:00:
-# https://www.facebook.com/141055983004923/photos/607150969728753/
-# So they won't be waiting for Alaska to join them on 2019-03-10, but will
-# rather change their clocks twice in seven weeks.
-
-# Zone  NAME            STDOFF  RULES   FORMAT  [UNTIL]
+# Zone  NAME            GMTOFF  RULES   FORMAT  [UNTIL]
 Zone America/Juneau      15:02:19 -     LMT     1867 Oct 19 15:33:32
                          -8:57:41 -     LMT     1900 Aug 20 12:00
                          -8:00  -       PST     1942
                          -8:00  US      P%sT    1946
                          -8:00  -       PST     1969

@@ -689,12 +646,10 @@
                          -8:00  -       PST     1942
                          -8:00  US      P%sT    1946
                          -8:00  -       PST     1969
                          -8:00  US      P%sT    1983 Oct 30  2:00
                          -8:00  -       PST     2015 Nov  1  2:00
-                         -9:00  US      AK%sT   2018 Nov  4  2:00
-                         -8:00  -       PST     2019 Jan 20  2:00
                          -9:00  US      AK%sT
 Zone America/Yakutat     14:41:05 -     LMT     1867 Oct 19 15:12:18
                          -9:18:55 -     LMT     1900 Aug 20 12:00
                          -9:00  -       YST     1942
                          -9:00  US      Y%sT    1946

@@ -783,11 +738,11 @@
 # of the Territory of Hawaii."
 #
 # Note that 1933-05-21 was a Sunday.
 # We're left to guess the time of day when Act 163 was approved; guess noon.
 
-# Zone  NAME            STDOFF  RULES   FORMAT  [UNTIL]
+# Zone  NAME            GMTOFF  RULES   FORMAT  [UNTIL]
 Zone Pacific/Honolulu   -10:31:26 -     LMT     1896 Jan 13 12:00
                         -10:30  -       HST     1933 Apr 30  2:00
                         -10:30  1:00    HDT     1933 May 21 12:00
                         -10:30  US      H%sT    1947 Jun  8  2:00
                         -10:00  -       HST

@@ -813,11 +768,11 @@
 # Laws 1968, ch. 183 (effective 1968-03-21) repealed DST.
 #
 # Shanks says the 1944 experiment came to an end on 1944-03-17.
 # Go with the Arizona State Library instead.
 
-# Zone  NAME            STDOFF  RULES   FORMAT  [UNTIL]
+# Zone  NAME            GMTOFF  RULES   FORMAT  [UNTIL]
 Zone America/Phoenix    -7:28:18 -      LMT     1883 Nov 18 11:31:42
                         -7:00   US      M%sT    1944 Jan  1  0:01
                         -7:00   -       MST     1944 Apr  1  0:01
                         -7:00   US      M%sT    1944 Oct  1  0:01
                         -7:00   -       MST     1967

@@ -839,11 +794,11 @@
 # Lemhi, Lincoln, Madison, Minidoka, Oneida, Owyhee, Payette, Power,
 # Teton, Twin Falls, Valley, Washington counties, and the southern
 # quarter of Idaho county) and eastern Oregon (most of Malheur County)
 # switched four weeks late in 1974.
 #
-# Zone  NAME            STDOFF  RULES   FORMAT  [UNTIL]
+# Zone  NAME            GMTOFF  RULES   FORMAT  [UNTIL]
 Zone America/Boise      -7:44:49 -      LMT     1883 Nov 18 12:15:11
                         -8:00   US      P%sT    1923 May 13  2:00
                         -7:00   US      M%sT    1974
                         -7:00   -       MST     1974 Feb  3  2:00
                         -7:00   US      M%sT

@@ -851,26 +806,10 @@
 # Indiana
 #
 # For a map of Indiana's time zone regions, see:
 # https://en.wikipedia.org/wiki/Time_in_Indiana
 #
-# From Paul Eggert (2018-11-30):
-# A brief but entertaining history of time in Indiana describes a 1949 debate
-# in the Indiana House where city legislators (who favored "fast time")
-# tussled with farm legislators (who didn't) over a bill to outlaw DST:
-#  "Lacking enough votes, the city faction tries to filibuster until time runs
-#   out on the session at midnight, but rural champion Rep. Herbert Copeland,
-#   R-Madison, leans over the gallery railing and forces the official clock
-#   back to 9 p.m., breaking it in the process.  The clock sticks on 9 as the
-#   debate rages on into the night.  The filibuster finally dies out and the
-#   bill passes, while outside the chamber, clocks read 3:30 a.m.  In the end,
-#   it doesn't matter which side won.  The law has no enforcement powers and
-#   is simply ignored by fast-time communities."
-# How Indiana went from 'God's time' to split zones and daylight-saving.
-# Indianapolis Star. 2018-11-27 14:58 -05.
-# https://www.indystar.com/story/news/politics/2018/11/27/indianapolis-indiana-time-zone-history-central-eastern-daylight-savings-time/2126300002/
-#
 # From Paul Eggert (2007-08-17):
 # Since 1970, most of Indiana has been like America/Indiana/Indianapolis,
 # with the following exceptions:
 #
 # - Gibson, Jasper, Lake, LaPorte, Newton, Porter, Posey, Spencer,

@@ -911,11 +850,11 @@
 
 # Rule  NAME    FROM    TO      TYPE    IN      ON      AT      SAVE    LETTER
 Rule Indianapolis 1941  only    -       Jun     22      2:00    1:00    D
 Rule Indianapolis 1941  1954    -       Sep     lastSun 2:00    0       S
 Rule Indianapolis 1946  1954    -       Apr     lastSun 2:00    1:00    D
-# Zone  NAME            STDOFF  RULES   FORMAT  [UNTIL]
+# Zone  NAME            GMTOFF  RULES   FORMAT  [UNTIL]
 Zone America/Indiana/Indianapolis -5:44:38 - LMT        1883 Nov 18 12:15:22
                         -6:00   US      C%sT    1920
                         -6:00 Indianapolis C%sT 1942
                         -6:00   US      C%sT    1946
                         -6:00 Indianapolis C%sT 1955 Apr 24  2:00

@@ -931,11 +870,11 @@
 # Rule  NAME    FROM    TO      TYPE    IN      ON      AT      SAVE    LETTER
 Rule    Marengo 1951    only    -       Apr     lastSun 2:00    1:00    D
 Rule    Marengo 1951    only    -       Sep     lastSun 2:00    0       S
 Rule    Marengo 1954    1960    -       Apr     lastSun 2:00    1:00    D
 Rule    Marengo 1954    1960    -       Sep     lastSun 2:00    0       S
-# Zone  NAME            STDOFF  RULES   FORMAT  [UNTIL]
+# Zone  NAME            GMTOFF  RULES   FORMAT  [UNTIL]
 Zone America/Indiana/Marengo -5:45:23 - LMT     1883 Nov 18 12:14:37
                         -6:00   US      C%sT    1951
                         -6:00   Marengo C%sT    1961 Apr 30  2:00
                         -5:00   -       EST     1969
                         -5:00   US      E%sT    1974 Jan  6  2:00

@@ -955,11 +894,11 @@
 Rule Vincennes  1955    only    -       May      1      0:00    1:00    D
 Rule Vincennes  1956    1963    -       Apr     lastSun 2:00    1:00    D
 Rule Vincennes  1960    only    -       Oct     lastSun 2:00    0       S
 Rule Vincennes  1961    only    -       Sep     lastSun 2:00    0       S
 Rule Vincennes  1962    1963    -       Oct     lastSun 2:00    0       S
-# Zone  NAME            STDOFF  RULES   FORMAT  [UNTIL]
+# Zone  NAME            GMTOFF  RULES   FORMAT  [UNTIL]
 Zone America/Indiana/Vincennes -5:50:07 - LMT   1883 Nov 18 12:09:53
                         -6:00   US      C%sT    1946
                         -6:00 Vincennes C%sT    1964 Apr 26  2:00
                         -5:00   -       EST     1969
                         -5:00   US      E%sT    1971

@@ -976,11 +915,11 @@
 Rule Perry      1955    only    -       May      1      0:00    1:00    D
 Rule Perry      1956    1963    -       Apr     lastSun 2:00    1:00    D
 Rule Perry      1960    only    -       Oct     lastSun 2:00    0       S
 Rule Perry      1961    only    -       Sep     lastSun 2:00    0       S
 Rule Perry      1962    1963    -       Oct     lastSun 2:00    0       S
-# Zone  NAME            STDOFF  RULES   FORMAT  [UNTIL]
+# Zone  NAME            GMTOFF  RULES   FORMAT  [UNTIL]
 Zone America/Indiana/Tell_City -5:47:03 - LMT   1883 Nov 18 12:12:57
                         -6:00   US      C%sT    1946
                         -6:00 Perry     C%sT    1964 Apr 26  2:00
                         -5:00   -       EST     1969
                         -5:00   US      E%sT    1971

@@ -992,11 +931,11 @@
 # Rule  NAME    FROM    TO      TYPE    IN      ON      AT      SAVE    LETTER
 Rule    Pike    1955    only    -       May      1      0:00    1:00    D
 Rule    Pike    1955    1960    -       Sep     lastSun 2:00    0       S
 Rule    Pike    1956    1964    -       Apr     lastSun 2:00    1:00    D
 Rule    Pike    1961    1964    -       Oct     lastSun 2:00    0       S
-# Zone  NAME            STDOFF  RULES   FORMAT  [UNTIL]
+# Zone  NAME            GMTOFF  RULES   FORMAT  [UNTIL]
 Zone America/Indiana/Petersburg -5:49:07 - LMT  1883 Nov 18 12:10:53
                         -6:00   US      C%sT    1955
                         -6:00   Pike    C%sT    1965 Apr 25  2:00
                         -5:00   -       EST     1966 Oct 30  2:00
                         -6:00   US      C%sT    1977 Oct 30  2:00

@@ -1014,11 +953,11 @@
 Rule    Starke  1947    1961    -       Apr     lastSun 2:00    1:00    D
 Rule    Starke  1947    1954    -       Sep     lastSun 2:00    0       S
 Rule    Starke  1955    1956    -       Oct     lastSun 2:00    0       S
 Rule    Starke  1957    1958    -       Sep     lastSun 2:00    0       S
 Rule    Starke  1959    1961    -       Oct     lastSun 2:00    0       S
-# Zone  NAME            STDOFF  RULES   FORMAT  [UNTIL]
+# Zone  NAME            GMTOFF  RULES   FORMAT  [UNTIL]
 Zone America/Indiana/Knox -5:46:30 -    LMT     1883 Nov 18 12:13:30
                         -6:00   US      C%sT    1947
                         -6:00   Starke  C%sT    1962 Apr 29  2:00
                         -5:00   -       EST     1963 Oct 27  2:00
                         -6:00   US      C%sT    1991 Oct 27  2:00

@@ -1030,22 +969,22 @@
 # Rule  NAME    FROM    TO      TYPE    IN      ON      AT      SAVE    LETTER
 Rule    Pulaski 1946    1960    -       Apr     lastSun 2:00    1:00    D
 Rule    Pulaski 1946    1954    -       Sep     lastSun 2:00    0       S
 Rule    Pulaski 1955    1956    -       Oct     lastSun 2:00    0       S
 Rule    Pulaski 1957    1960    -       Sep     lastSun 2:00    0       S
-# Zone  NAME            STDOFF  RULES   FORMAT  [UNTIL]
+# Zone  NAME            GMTOFF  RULES   FORMAT  [UNTIL]
 Zone America/Indiana/Winamac -5:46:25 - LMT     1883 Nov 18 12:13:35
                         -6:00   US      C%sT    1946
                         -6:00   Pulaski C%sT    1961 Apr 30  2:00
                         -5:00   -       EST     1969
                         -5:00   US      E%sT    1971
                         -5:00   -       EST     2006 Apr  2  2:00
                         -6:00   US      C%sT    2007 Mar 11  2:00
                         -5:00   US      E%sT
 #
 # Switzerland County, Indiana, did not observe DST from 1973 through 2005.
-# Zone  NAME            STDOFF  RULES   FORMAT  [UNTIL]
+# Zone  NAME            GMTOFF  RULES   FORMAT  [UNTIL]
 Zone America/Indiana/Vevay -5:40:16 -   LMT     1883 Nov 18 12:19:44
                         -6:00   US      C%sT    1954 Apr 25  2:00
                         -5:00   -       EST     1969
                         -5:00   US      E%sT    1973
                         -5:00   -       EST     2006

@@ -1066,11 +1005,11 @@
 Rule Louisville 1941    1961    -       Apr     lastSun 2:00    1:00    D
 Rule Louisville 1941    only    -       Sep     lastSun 2:00    0       S
 Rule Louisville 1946    only    -       Jun     2       2:00    0       S
 Rule Louisville 1950    1955    -       Sep     lastSun 2:00    0       S
 Rule Louisville 1956    1960    -       Oct     lastSun 2:00    0       S
-# Zone  NAME            STDOFF  RULES   FORMAT  [UNTIL]
+# Zone  NAME            GMTOFF  RULES   FORMAT  [UNTIL]
 Zone America/Kentucky/Louisville -5:43:02 -     LMT     1883 Nov 18 12:16:58
                         -6:00   US      C%sT    1921
                         -6:00 Louisville C%sT   1942
                         -6:00   US      C%sT    1946
                         -6:00 Louisville C%sT   1961 Jul 23  2:00

@@ -1172,11 +1111,11 @@
 #
 # Most of Michigan observed DST from 1973 on, but was a bit late in 1975.
 # Rule  NAME    FROM    TO      TYPE    IN      ON      AT      SAVE    LETTER
 Rule    Detroit 1948    only    -       Apr     lastSun 2:00    1:00    D
 Rule    Detroit 1948    only    -       Sep     lastSun 2:00    0       S
-# Zone  NAME            STDOFF  RULES   FORMAT  [UNTIL]
+# Zone  NAME            GMTOFF  RULES   FORMAT  [UNTIL]
 Zone America/Detroit    -5:32:11 -      LMT     1905
                         -6:00   -       CST     1915 May 15  2:00
                         -5:00   -       EST     1942
                         -5:00   US      E%sT    1946
                         -5:00   Detroit E%sT    1973

@@ -1189,11 +1128,11 @@
 # Rule  NAME    FROM    TO      TYPE    IN      ON      AT      SAVE    LETTER
 Rule Menominee  1946    only    -       Apr     lastSun 2:00    1:00    D
 Rule Menominee  1946    only    -       Sep     lastSun 2:00    0       S
 Rule Menominee  1966    only    -       Apr     lastSun 2:00    1:00    D
 Rule Menominee  1966    only    -       Oct     lastSun 2:00    0       S
-# Zone  NAME            STDOFF  RULES   FORMAT  [UNTIL]
+# Zone  NAME            GMTOFF  RULES   FORMAT  [UNTIL]
 Zone America/Menominee  -5:50:27 -      LMT     1885 Sep 18 12:00
                         -6:00   US      C%sT    1946
                         -6:00 Menominee C%sT    1969 Apr 27  2:00
                         -5:00   -       EST     1973 Apr 29  2:00
                         -6:00   US      C%sT

@@ -1423,11 +1362,11 @@
 Rule    StJohns 1989    2006    -       Apr     Sun>=1  0:01    1:00    D
 Rule    StJohns 2007    2011    -       Mar     Sun>=8  0:01    1:00    D
 Rule    StJohns 2007    2010    -       Nov     Sun>=1  0:01    0       S
 #
 # St John's has an apostrophe, but Posix file names can't have apostrophes.
-# Zone  NAME            STDOFF  RULES   FORMAT  [UNTIL]
+# Zone  NAME            GMTOFF  RULES   FORMAT  [UNTIL]
 Zone America/St_Johns   -3:30:52 -      LMT     1884
                         -3:30:52 StJohns N%sT   1918
                         -3:30:52 Canada N%sT    1919
                         -3:30:52 StJohns N%sT   1935 Mar 30
                         -3:30   StJohns N%sT    1942 May 11

@@ -1436,11 +1375,11 @@
                         -3:30   Canada  N%sT
 
 # most of east Labrador
 
 # The name 'Happy Valley-Goose Bay' is too long; use 'Goose Bay'.
-# Zone  NAME            STDOFF  RULES   FORMAT  [UNTIL]
+# Zone  NAME            GMTOFF  RULES   FORMAT  [UNTIL]
 Zone America/Goose_Bay  -4:01:40 -      LMT     1884 # Happy Valley-Goose Bay
                         -3:30:52 -      NST     1918
                         -3:30:52 Canada N%sT    1919
                         -3:30:52 -      NST     1935 Mar 30
                         -3:30   -       NST     1936

@@ -1510,11 +1449,11 @@
 Rule    Halifax 1951    1954    -       Sep     lastSun 2:00    0       S
 Rule    Halifax 1956    1959    -       Apr     lastSun 2:00    1:00    D
 Rule    Halifax 1956    1959    -       Sep     lastSun 2:00    0       S
 Rule    Halifax 1962    1973    -       Apr     lastSun 2:00    1:00    D
 Rule    Halifax 1962    1973    -       Oct     lastSun 2:00    0       S
-# Zone  NAME            STDOFF  RULES   FORMAT  [UNTIL]
+# Zone  NAME            GMTOFF  RULES   FORMAT  [UNTIL]
 Zone America/Halifax    -4:14:24 -      LMT     1902 Jun 15
                         -4:00   Halifax A%sT    1918
                         -4:00   Canada  A%sT    1919
                         -4:00   Halifax A%sT    1942 Feb  9  2:00s
                         -4:00   Canada  A%sT    1946

@@ -1548,11 +1487,11 @@
 Rule    Moncton 1946    1972    -       Apr     lastSun 2:00    1:00    D
 Rule    Moncton 1946    1956    -       Sep     lastSun 2:00    0       S
 Rule    Moncton 1957    1972    -       Oct     lastSun 2:00    0       S
 Rule    Moncton 1993    2006    -       Apr     Sun>=1  0:01    1:00    D
 Rule    Moncton 1993    2006    -       Oct     lastSun 0:01    0       S
-# Zone  NAME            STDOFF  RULES   FORMAT  [UNTIL]
+# Zone  NAME            GMTOFF  RULES   FORMAT  [UNTIL]
 Zone America/Moncton    -4:19:08 -      LMT     1883 Dec  9
                         -5:00   -       EST     1902 Jun 15
                         -4:00   Canada  A%sT    1933
                         -4:00   Moncton A%sT    1942
                         -4:00   Canada  A%sT    1946

@@ -1577,11 +1516,11 @@
 # https://www.assnat.qc.ca/Media/Process.aspx?MediaId=ANQ.Vigie.Bll.DocumentGenerique_8845en
 # says this common practice was codified into law as of 2007.
 # For lack of better info, guess this practice began around 1970, contra to
 # Shanks & Pottenger who have this region observing AST/ADT.
 
-# Zone  NAME            STDOFF  RULES   FORMAT  [UNTIL]
+# Zone  NAME            GMTOFF  RULES   FORMAT  [UNTIL]
 Zone America/Blanc-Sablon -3:48:28 -    LMT     1884
                         -4:00   Canada  A%sT    1970
                         -4:00   -       AST
 
 # Ontario

@@ -1745,14 +1684,23 @@
 Rule    Toronto 1922    1923    -       May     Sun>=8  2:00    1:00    D
 # Shanks & Pottenger say 1923-09-19; assume it's a typo and that "-16"
 # was meant.
 Rule    Toronto 1922    1926    -       Sep     Sun>=15 2:00    0       S
 Rule    Toronto 1924    1927    -       May     Sun>=1  2:00    1:00    D
-Rule    Toronto 1927    1937    -       Sep     Sun>=25 2:00    0       S
-Rule    Toronto 1928    1937    -       Apr     Sun>=25 2:00    1:00    D
-Rule    Toronto 1938    1940    -       Apr     lastSun 2:00    1:00    D
-Rule    Toronto 1938    1939    -       Sep     lastSun 2:00    0       S
+# The 1927-to-1939 rules can be expressed more simply as
+# Rule  Toronto 1927    1937    -       Sep     Sun>=25 2:00    0       S
+# Rule  Toronto 1928    1937    -       Apr     Sun>=25 2:00    1:00    D
+# Rule  Toronto 1938    1940    -       Apr     lastSun 2:00    1:00    D
+# Rule  Toronto 1938    1939    -       Sep     lastSun 2:00    0       S
+# The rules below avoid use of Sun>=25
+# (which pre-2004 versions of zic cannot handle).
+Rule    Toronto 1927    1932    -       Sep     lastSun 2:00    0       S
+Rule    Toronto 1928    1931    -       Apr     lastSun 2:00    1:00    D
+Rule    Toronto 1932    only    -       May     1       2:00    1:00    D
+Rule    Toronto 1933    1940    -       Apr     lastSun 2:00    1:00    D
+Rule    Toronto 1933    only    -       Oct     1       2:00    0       S
+Rule    Toronto 1934    1939    -       Sep     lastSun 2:00    0       S
 Rule    Toronto 1945    1946    -       Sep     lastSun 2:00    0       S
 Rule    Toronto 1946    only    -       Apr     lastSun 2:00    1:00    D
 Rule    Toronto 1947    1949    -       Apr     lastSun 0:00    1:00    D
 Rule    Toronto 1947    1948    -       Sep     lastSun 0:00    0       S
 Rule    Toronto 1949    only    -       Nov     lastSun 0:00    0       S

@@ -1781,11 +1729,11 @@
 # savings time in 1916, Fort William and Port Arthur, having done so
 # already, did not change their clocks....  During the Second World
 # War,... [t]he cities agreed to implement DST during the summer
 # months for the remainder of the war years.
 
-# Zone  NAME            STDOFF  RULES   FORMAT  [UNTIL]
+# Zone  NAME            GMTOFF  RULES   FORMAT  [UNTIL]
 Zone America/Toronto    -5:17:32 -      LMT     1895
                         -5:00   Canada  E%sT    1919
                         -5:00   Toronto E%sT    1942 Feb  9  2:00s
                         -5:00   Canada  E%sT    1946
                         -5:00   Toronto E%sT    1974

@@ -1856,11 +1804,11 @@
 Rule    Winn    1963    only    -       Apr     lastSun 2:00    1:00    D
 Rule    Winn    1963    only    -       Sep     22      2:00    0       S
 Rule    Winn    1966    1986    -       Apr     lastSun 2:00s   1:00    D
 Rule    Winn    1966    2005    -       Oct     lastSun 2:00s   0       S
 Rule    Winn    1987    2005    -       Apr     Sun>=1  2:00s   1:00    D
-# Zone  NAME            STDOFF  RULES   FORMAT  [UNTIL]
+# Zone  NAME            GMTOFF  RULES   FORMAT  [UNTIL]
 Zone America/Winnipeg   -6:28:36 -      LMT     1887 Jul 16
                         -6:00   Winn    C%sT    2006
                         -6:00   Canada  C%sT
 
 

@@ -1878,17 +1826,10 @@
 
 # From Paul Eggert (2003-07-27):
 # Willett (1914-03) notes that DST "has been in operation ... in the
 # City of Moose Jaw, Saskatchewan, for one year."
 
-# From Paul Eggert (2019-04-26):
-# Chris Pearce's book "The Great Daylight Saving Time Controversy" (2017)
-# says that Regina observed DST in 1914-1917.  No dates and times,
-# unfortunately.  It also says that in 1914 Saskatoon observed DST
-# from 1 June to 6 July, and that DST was also tried out in Davidson,
-# Melfort, and Prince Albert.
-
 # From Paul Eggert (2006-03-22):
 # Shanks & Pottenger say that since 1970 this region has mostly been as Regina.
 # Some western towns (e.g. Swift Current) switched from MST/MDT to CST in 1972.
 # Other western towns (e.g. Lloydminster) are like Edmonton.
 # Matthews and Vincent (1998) write that Denare Beach and Creighton

@@ -1947,11 +1888,11 @@
 Rule    Swift   1957    only    -       Apr     lastSun 2:00    1:00    D
 Rule    Swift   1957    only    -       Oct     lastSun 2:00    0       S
 Rule    Swift   1959    1961    -       Apr     lastSun 2:00    1:00    D
 Rule    Swift   1959    only    -       Oct     lastSun 2:00    0       S
 Rule    Swift   1960    1961    -       Sep     lastSun 2:00    0       S
-# Zone  NAME            STDOFF  RULES   FORMAT  [UNTIL]
+# Zone  NAME            GMTOFF  RULES   FORMAT  [UNTIL]
 Zone America/Regina     -6:58:36 -      LMT     1905 Sep
                         -7:00   Regina  M%sT    1960 Apr lastSun  2:00
                         -6:00   -       CST
 Zone America/Swift_Current -7:11:20 -   LMT     1905 Sep
                         -7:00   Canada  M%sT    1946 Apr lastSun  2:00

@@ -1978,11 +1919,11 @@
 Rule    Edm     1967    only    -       Oct     lastSun 2:00    0       S
 Rule    Edm     1969    only    -       Apr     lastSun 2:00    1:00    D
 Rule    Edm     1969    only    -       Oct     lastSun 2:00    0       S
 Rule    Edm     1972    1986    -       Apr     lastSun 2:00    1:00    D
 Rule    Edm     1972    2006    -       Oct     lastSun 2:00    0       S
-# Zone  NAME            STDOFF  RULES   FORMAT  [UNTIL]
+# Zone  NAME            GMTOFF  RULES   FORMAT  [UNTIL]
 Zone America/Edmonton   -7:33:52 -      LMT     1906 Sep
                         -7:00   Edm     M%sT    1987
                         -7:00   Canada  M%sT
 
 

@@ -2071,11 +2012,11 @@
 Rule    Vanc    1945    only    -       Sep     30      2:00    0       S
 Rule    Vanc    1946    1986    -       Apr     lastSun 2:00    1:00    D
 Rule    Vanc    1946    only    -       Oct     13      2:00    0       S
 Rule    Vanc    1947    1961    -       Sep     lastSun 2:00    0       S
 Rule    Vanc    1962    2006    -       Oct     lastSun 2:00    0       S
-# Zone  NAME            STDOFF  RULES   FORMAT  [UNTIL]
+# Zone  NAME            GMTOFF  RULES   FORMAT  [UNTIL]
 Zone America/Vancouver  -8:12:28 -      LMT     1884
                         -8:00   Vanc    P%sT    1987
                         -8:00   Canada  P%sT
 Zone America/Dawson_Creek -8:00:56 -    LMT     1884
                         -8:00   Canada  P%sT    1947

@@ -2142,11 +2083,11 @@
 #
 #     (2) Notwithstanding subsection (1), the Commissioner may make regulations
 #     varying the manner of reckoning standard time.
 #
 # * Yukon Territory Commissioner's Order 1966-20 Interpretation Ordinance
-#   [no online source found]
+#   http://? - no online source found
 #
 # * Standard Time and Time Zones in Canada; Thomson, Malcolm M.; JRASC,
 #   Vol. 64, pp.129-162; June 1970; SAO/NASA Astrophysics Data System (ADS)
 #   http://adsabs.harvard.edu/abs/1970JRASC..64..129T from p.156: Yukon
 #   Territory Commissioner's Order 1967-59 Interpretation Ordinance ...

@@ -2175,11 +2116,11 @@
 #     Act from and after midnight on the twenty-eighth day of October, 1973
 #     shall be reckoned in the same manner as Pacific Standard Time, that is
 #     to say eight hours behind Greenwich Time.
 #
 # * O.I.C. 1980/02 INTERPRETATION ACT
-#   [no online source found]
+#   http://? - no online source found
 #
 # * Yukon Daylight Saving Time, YOIC 1987/56
 #   https://www.canlii.org/en/yk/laws/regu/yoic-1987-56/latest/yoic-1987-56.html
 #   O.I.C. 1987/056 INTERPRETATION ACT ...
 #

@@ -2391,11 +2332,11 @@
 Rule    NT_YK   1965    only    -       Apr     lastSun 0:00    2:00    DD
 Rule    NT_YK   1965    only    -       Oct     lastSun 2:00    0       S
 Rule    NT_YK   1980    1986    -       Apr     lastSun 2:00    1:00    D
 Rule    NT_YK   1980    2006    -       Oct     lastSun 2:00    0       S
 Rule    NT_YK   1987    2006    -       Apr     Sun>=1  2:00    1:00    D
-# Zone  NAME            STDOFF  RULES   FORMAT  [UNTIL]
+# Zone  NAME            GMTOFF  RULES   FORMAT  [UNTIL]
 # aka Panniqtuuq
 Zone America/Pangnirtung 0      -       -00     1921 # trading post est.
                         -4:00   NT_YK   A%sT    1995 Apr Sun>=1  2:00
                         -5:00   Canada  E%sT    1999 Oct 31  2:00
                         -6:00   Canada  C%sT    2000 Oct 29  2:00

@@ -2538,11 +2479,11 @@
 # (2001-02-01) shows Baja and Chihauhua as still using US DST rules,
 # and Sonora with no DST.  This was reported by Jesper Nørgaard (2001-02-03).
 
 # From Paul Eggert (2001-03-03):
 #
-# https://www.latimes.com/archives/la-xpm-2001-mar-03-mn-32561-story.html
+# http://www.latimes.com/news/nation/20010303/t000018766.html
 # James F. Smith writes in today's LA Times
 # * Sonora will continue to observe standard time.
 # * Last week Mexico City's mayor Andrés Manuel López Obrador decreed that
 #   the Federal District will not adopt DST.
 # * 4 of 16 district leaders announced they'll ignore the decree.

@@ -2665,11 +2606,11 @@
 Rule    Mexico  1996    2000    -       Oct     lastSun 2:00    0       S
 Rule    Mexico  2001    only    -       May     Sun>=1  2:00    1:00    D
 Rule    Mexico  2001    only    -       Sep     lastSun 2:00    0       S
 Rule    Mexico  2002    max     -       Apr     Sun>=1  2:00    1:00    D
 Rule    Mexico  2002    max     -       Oct     lastSun 2:00    0       S
-# Zone  NAME            STDOFF  RULES   FORMAT  [UNTIL]
+# Zone  NAME            GMTOFF  RULES   FORMAT  [UNTIL]
 # Quintana Roo; represented by Cancún
 Zone America/Cancun     -5:47:04 -      LMT     1922 Jan  1  0:12:56
                         -6:00   -       CST     1981 Dec 23
                         -5:00   Mexico  E%sT    1998 Aug  2  2:00
                         -6:00   Mexico  C%sT    2015 Feb  1  2:00

@@ -2858,11 +2799,11 @@
 # http://www.jonesbahamas.com/?c=45&a=10412
 
 # Rule  NAME    FROM    TO      TYPE    IN      ON      AT      SAVE    LETTER/S
 Rule    Bahamas 1964    1975    -       Oct     lastSun 2:00    0       S
 Rule    Bahamas 1964    1975    -       Apr     lastSun 2:00    1:00    D
-# Zone  NAME            STDOFF  RULES   FORMAT  [UNTIL]
+# Zone  NAME            GMTOFF  RULES   FORMAT  [UNTIL]
 Zone    America/Nassau  -5:09:30 -      LMT     1912 Mar 2
                         -5:00   Bahamas E%sT    1976
                         -5:00   US      E%sT
 
 # Barbados

@@ -2873,11 +2814,11 @@
 Rule    Barb    1977    only    -       Jun     12      2:00    1:00    D
 Rule    Barb    1977    1978    -       Oct     Sun>=1  2:00    0       S
 Rule    Barb    1978    1980    -       Apr     Sun>=15 2:00    1:00    D
 Rule    Barb    1979    only    -       Sep     30      2:00    0       S
 Rule    Barb    1980    only    -       Sep     25      2:00    0       S
-# Zone  NAME            STDOFF  RULES   FORMAT  [UNTIL]
+# Zone  NAME            GMTOFF  RULES   FORMAT  [UNTIL]
 Zone America/Barbados   -3:58:29 -      LMT     1924 # Bridgetown
                         -3:58:29 -      BMT     1932 # Bridgetown Mean Time
                         -4:00   Barb    A%sT
 
 # Belize

@@ -2887,11 +2828,11 @@
 Rule    Belize  1919    1943    -       Feb     Sun>=9  0:00    0       CST
 Rule    Belize  1973    only    -       Dec      5      0:00    1:00    CDT
 Rule    Belize  1974    only    -       Feb      9      0:00    0       CST
 Rule    Belize  1982    only    -       Dec     18      0:00    1:00    CDT
 Rule    Belize  1983    only    -       Feb     12      0:00    0       CST
-# Zone  NAME            STDOFF  RULES   FORMAT  [UNTIL]
+# Zone  NAME            GMTOFF  RULES   FORMAT  [UNTIL]
 Zone    America/Belize  -5:52:48 -      LMT     1912 Apr
                         -6:00   Belize  %s
 
 # Bermuda
 

@@ -2904,11 +2845,11 @@
 # in March, until the first Sunday in November.  And, after the Time Zone
 # (Seasonal Variation) Bill 2006 was passed in the House of Assembly on
 # Friday, the same thing will happen in Bermuda.
 # http://www.theroyalgazette.com/apps/pbcs.dll/article?AID=/20060529/NEWS/105290135
 
-# Zone  NAME            STDOFF  RULES   FORMAT  [UNTIL]
+# Zone  NAME            GMTOFF  RULES   FORMAT  [UNTIL]
 Zone Atlantic/Bermuda   -4:19:18 -      LMT     1930 Jan  1  2:00 # Hamilton
                         -4:00   -       AST     1974 Apr 28  2:00
                         -4:00   Canada  A%sT    1976
                         -4:00   US      A%sT
 

@@ -2926,11 +2867,11 @@
 # IATA SSIM (1991-09) says the following was at 1:00;
 # go with Shanks & Pottenger.
 Rule    CR      1991    only    -       Jul      1      0:00    0       S
 Rule    CR      1992    only    -       Mar     15      0:00    0       S
 # There are too many San Josés elsewhere, so we'll use 'Costa Rica'.
-# Zone  NAME            STDOFF  RULES   FORMAT  [UNTIL]
+# Zone  NAME            GMTOFF  RULES   FORMAT  [UNTIL]
 Zone America/Costa_Rica -5:36:13 -      LMT     1890        # San José
                         -5:36:13 -      SJMT    1921 Jan 15 # San José Mean Time
                         -6:00   CR      C%sT
 # Coco
 # no information; probably like America/Costa_Rica

@@ -3132,11 +3073,11 @@
 Rule    Cuba    2011    only    -       Nov     13      0:00s   0       S
 Rule    Cuba    2012    only    -       Apr     1       0:00s   1:00    D
 Rule    Cuba    2012    max     -       Nov     Sun>=1  0:00s   0       S
 Rule    Cuba    2013    max     -       Mar     Sun>=8  0:00s   1:00    D
 
-# Zone  NAME            STDOFF  RULES   FORMAT  [UNTIL]
+# Zone  NAME            GMTOFF  RULES   FORMAT  [UNTIL]
 Zone    America/Havana  -5:29:28 -      LMT     1890
                         -5:29:36 -      HMT     1925 Jul 19 12:00 # Havana MT
                         -5:00   Cuba    C%sT
 
 # Dominica

@@ -3167,11 +3108,11 @@
 Rule    DR      1967    only    -       Feb     28      0:00    0       EST
 Rule    DR      1969    1973    -       Oct     lastSun 0:00    0:30    -0430
 Rule    DR      1970    only    -       Feb     21      0:00    0       EST
 Rule    DR      1971    only    -       Jan     20      0:00    0       EST
 Rule    DR      1972    1974    -       Jan     21      0:00    0       EST
-# Zone  NAME            STDOFF  RULES   FORMAT  [UNTIL]
+# Zone  NAME            GMTOFF  RULES   FORMAT  [UNTIL]
 Zone America/Santo_Domingo -4:39:36 -   LMT     1890
                         -4:40   -       SDMT    1933 Apr  1 12:00 # S. Dom. MT
                         -5:00   DR      %s      1974 Oct 27
                         -4:00   -       AST     2000 Oct 29  2:00
                         -5:00   US      E%sT    2000 Dec  3  1:00

@@ -3182,11 +3123,11 @@
 # Rule  NAME    FROM    TO      TYPE    IN      ON      AT      SAVE    LETTER/S
 Rule    Salv    1987    1988    -       May     Sun>=1  0:00    1:00    D
 Rule    Salv    1987    1988    -       Sep     lastSun 0:00    0       S
 # There are too many San Salvadors elsewhere, so use America/El_Salvador
 # instead of America/San_Salvador.
-# Zone  NAME            STDOFF  RULES   FORMAT  [UNTIL]
+# Zone  NAME            GMTOFF  RULES   FORMAT  [UNTIL]
 Zone America/El_Salvador -5:56:48 -     LMT     1921 # San Salvador
                         -6:00   Salv    C%sT
 
 # Grenada
 # Guadeloupe

@@ -3215,11 +3156,11 @@
 Rule    Guat    1983    only    -       Sep     22      0:00    0       S
 Rule    Guat    1991    only    -       Mar     23      0:00    1:00    D
 Rule    Guat    1991    only    -       Sep      7      0:00    0       S
 Rule    Guat    2006    only    -       Apr     30      0:00    1:00    D
 Rule    Guat    2006    only    -       Oct      1      0:00    0       S
-# Zone  NAME            STDOFF  RULES   FORMAT  [UNTIL]
+# Zone  NAME            GMTOFF  RULES   FORMAT  [UNTIL]
 Zone America/Guatemala  -6:02:04 -      LMT     1918 Oct 5
                         -6:00   Guat    C%sT
 
 # Haiti
 # From Gwillim Law (2005-04-15):

@@ -3301,11 +3242,11 @@
 Rule    Haiti   2005    2006    -       Oct     lastSun 0:00    0       S
 Rule    Haiti   2012    2015    -       Mar     Sun>=8  2:00    1:00    D
 Rule    Haiti   2012    2015    -       Nov     Sun>=1  2:00    0       S
 Rule    Haiti   2017    max     -       Mar     Sun>=8  2:00    1:00    D
 Rule    Haiti   2017    max     -       Nov     Sun>=1  2:00    0       S
-# Zone  NAME            STDOFF  RULES   FORMAT  [UNTIL]
+# Zone  NAME            GMTOFF  RULES   FORMAT  [UNTIL]
 Zone America/Port-au-Prince -4:49:20 -  LMT     1890
                         -4:49   -       PPMT    1917 Jan 24 12:00 # P-a-P MT
                         -5:00   Haiti   E%sT
 
 # Honduras

@@ -3340,11 +3281,11 @@
 # Rule  NAME    FROM    TO      TYPE    IN      ON      AT      SAVE    LETTER/S
 Rule    Hond    1987    1988    -       May     Sun>=1  0:00    1:00    D
 Rule    Hond    1987    1988    -       Sep     lastSun 0:00    0       S
 Rule    Hond    2006    only    -       May     Sun>=1  0:00    1:00    D
 Rule    Hond    2006    only    -       Aug     Mon>=1  0:00    0       S
-# Zone  NAME            STDOFF  RULES   FORMAT  [UNTIL]
+# Zone  NAME            GMTOFF  RULES   FORMAT  [UNTIL]
 Zone America/Tegucigalpa -5:48:52 -     LMT     1921 Apr
                         -6:00   Hond    C%sT
 #
 # Great Swan I ceded by US to Honduras in 1972
 

@@ -3361,19 +3302,19 @@
 # and with the Rod of Correction which Manley said he had received from
 # Haile Selassie, Emperor of Ethiopia.  See:
 # Neita L. The politician in all of us. Jamaica Observer 2014-09-20
 # http://www.jamaicaobserver.com/columns/The-politician-in-all-of-us_17573647
 #
-# Zone  NAME            STDOFF  RULES   FORMAT  [UNTIL]
+# Zone  NAME            GMTOFF  RULES   FORMAT  [UNTIL]
 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
 
 # Martinique
-# Zone  NAME            STDOFF  RULES   FORMAT  [UNTIL]
+# Zone  NAME            GMTOFF  RULES   FORMAT  [UNTIL]
 Zone America/Martinique -4:04:20 -      LMT     1890        # Fort-de-France
                         -4:04:20 -      FFMT    1911 May    # Fort-de-France MT
                         -4:00   -       AST     1980 Apr  6
                         -4:00   1:00    ADT     1980 Sep 28
                         -4:00   -       AST

@@ -3433,11 +3374,11 @@
 Rule    Nic     1979    1980    -       Jun     Mon>=23 0:00    0       S
 Rule    Nic     2005    only    -       Apr     10      0:00    1:00    D
 Rule    Nic     2005    only    -       Oct     Sun>=1  0:00    0       S
 Rule    Nic     2006    only    -       Apr     30      2:00    1:00    D
 Rule    Nic     2006    only    -       Oct     Sun>=1  1:00    0       S
-# Zone  NAME            STDOFF  RULES   FORMAT  [UNTIL]
+# Zone  NAME            GMTOFF  RULES   FORMAT  [UNTIL]
 Zone    America/Managua -5:45:08 -      LMT     1890
                         -5:45:12 -      MMT     1934 Jun 23 # Managua Mean Time?
                         -6:00   -       CST     1973 May
                         -5:00   -       EST     1975 Feb 16
                         -6:00   Nic     C%sT    1992 Jan  1  4:00

@@ -3445,19 +3386,19 @@
                         -6:00   -       CST     1993
                         -5:00   -       EST     1997
                         -6:00   Nic     C%sT
 
 # Panama
-# Zone  NAME            STDOFF  RULES   FORMAT  [UNTIL]
+# Zone  NAME            GMTOFF  RULES   FORMAT  [UNTIL]
 Zone    America/Panama  -5:18:08 -      LMT     1890
                         -5:19:36 -      CMT     1908 Apr 22 # Colón Mean Time
                         -5:00   -       EST
 Link America/Panama America/Cayman
 
 # Puerto Rico
 # There are too many San Juans elsewhere, so we'll use 'Puerto_Rico'.
-# Zone  NAME            STDOFF  RULES   FORMAT  [UNTIL]
+# Zone  NAME            GMTOFF  RULES   FORMAT  [UNTIL]
 Zone America/Puerto_Rico -4:24:25 -     LMT     1899 Mar 28 12:00 # San Juan
                         -4:00   -       AST     1942 May  3
                         -4:00   US      A%sT    1946
                         -4:00   -       AST
 

@@ -3465,11 +3406,11 @@
 # St Lucia
 # See America/Port_of_Spain.
 
 # St Pierre and Miquelon
 # There are too many St Pierres elsewhere, so we'll use 'Miquelon'.
-# Zone  NAME            STDOFF  RULES   FORMAT  [UNTIL]
+# Zone  NAME            GMTOFF  RULES   FORMAT  [UNTIL]
 Zone America/Miquelon   -3:44:40 -      LMT     1911 May 15 # St Pierre
                         -4:00   -       AST     1980 May
                         -3:00   -       -03     1987
                         -3:00   Canada  -03/-02
 

@@ -3511,11 +3452,11 @@
 # The date of effect of the spring 2018 change appears to be March 11,
 # which makes more sense.  See: Hamilton D. Time change back
 # by March 2018 for TCI. Magnetic Media. 2017-08-25.
 # http://magneticmediatv.com/2017/08/time-change-back-by-march-2018-for-tci/
 #
-# Zone  NAME            STDOFF  RULES   FORMAT  [UNTIL]
+# Zone  NAME            GMTOFF  RULES   FORMAT  [UNTIL]
 Zone America/Grand_Turk -4:44:32 -      LMT     1890
                         -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
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