diff --git a/northamerica b/northamerica
index 32a18a1..0c0f0db 100644
--- a/northamerica
+++ b/northamerica
@@ -144,6 +144,7 @@ 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		GMTOFF	RULES	FORMAT	[UNTIL]
+#Updated Zone America/New_York 1997 Nov 19
 Zone America/New_York	-4:56:02 -	LMT	1883 Nov 18 12:00
 			-5:00	US	E%sT	1920
 			-5:00	NYC	E%sT	1942
@@ -160,6 +161,7 @@ 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		GMTOFF	RULES	FORMAT	[UNTIL]
+#Updated Zone America/Chicago 1997 Nov 19
 Zone America/Chicago	-5:50:36 -	LMT	1883 Nov 18 12:00
 			-6:00	US	C%sT	1920
 			-6:00	Chicago	C%sT	1936 Mar  1 2:00
@@ -177,6 +179,7 @@ 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		GMTOFF	RULES	FORMAT	[UNTIL]
+#Updated Zone America/Denver 1997 Nov 19
 Zone America/Denver	-6:59:56 -	LMT	1883 Nov 18 12:00
 			-7:00	US	M%sT	1920
 			-7:00	Denver	M%sT	1942
@@ -192,6 +195,7 @@ Rule	CA	1950	1966	-	Apr	lastSun	2:00	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		GMTOFF	RULES	FORMAT	[UNTIL]
+#Updated Zone America/Los_Angeles 1997 Nov 19
 Zone America/Los_Angeles -7:52:58 -	LMT	1883 Nov 18 12:00
 			-8:00	US	P%sT	1946
 			-8:00	CA	P%sT	1967
@@ -207,18 +211,21 @@ Zone America/Los_Angeles -7:52:58 -	LMT	1883 Nov 18 12:00
 # changes from Julian to Gregorian.
 #
 # Zone	NAME		GMTOFF	RULES	FORMAT	[UNTIL]
+#Updated Zone America/Juneau 1997 Nov 19
 Zone America/Juneau	 -8:57:41 -	LMT	1900 Aug 20 12:00
 			 -8:00	-	PST	1942
 			 -8:00	US	P%sT	1946
 			 -8:00	-	PST	1969
 			 -8:00	US	P%sT	1983 Oct 30 2:00
 			 -9:00	US	AK%sT
+#Updated Zone America/Yakutat 1997 Nov 19
 Zone America/Yakutat	 -9:18:55 -	LMT	1900 Aug 20 12:00
 			 -9:00	-	YST	1942
 			 -9:00	US	Y%sT	1946
 			 -9:00	-	YST	1969
 			 -9:00	US	Y%sT	1983 Oct 30 2:00
 			 -9:00	US	AK%sT
+#Updated Zone America/Anchorage 1997 Nov 19
 Zone America/Anchorage	 -9:59:36 -	LMT	1900 Aug 20 12:00
 			-10:00	-	CAT	1942
 			-10:00	US	CAT/CAWT 1946
@@ -226,6 +233,7 @@ Zone America/Anchorage	 -9:59:36 -	LMT	1900 Aug 20 12:00
 			-10:00	-	AHST	1969
 			-10:00	US	AH%sT	1983 Oct 30 2:00
 			 -9:00	US	AK%sT
+#Updated Zone America/Nome 1997 Nov 19
 Zone America/Nome	-11:01:38 -	LMT	1900 Aug 20 12:00
 			-11:00	-	NST	1942
 			-11:00	US	N%sT	1946
@@ -233,6 +241,7 @@ Zone America/Nome	-11:01:38 -	LMT	1900 Aug 20 12:00
 			-11:00	-	BST	1969
 			-11:00	US	B%sT	1983 Oct 30 2:00
 			 -9:00	US	AK%sT
+#Updated Zone America/Adak 1997 Nov 19
 Zone America/Adak	-11:46:38 -	LMT	1900 Aug 20 12:00
 			-11:00	-	NST	1942
 			-11:00	US	N%sT	1946
@@ -256,12 +265,14 @@ Zone America/Adak	-11:46:38 -	LMT	1900 Aug 20 12:00
 # From Paul Eggert:
 # Shanks says the 1933 experiment lasted for three weeks.  Go with Shanks.
 #
+#Updated Zone Pacific/Honolulu 1997 Nov 19
 Zone Pacific/Honolulu	-10:31:26 -	LMT	1900 Jan  1 12:00
 			-10:30	-	HST	1933 Apr 30 2:00
 			-10:30	1:00	HDT	1933 May 21 2:00
 			-10:30	US	H%sT	1947 Jun  8 2:00
 			-10:00	-	HST
 
+#Updated Zone Pacific/Midway 1997 Nov 19
 Zone Pacific/Midway	-11:49:28 -	LMT	1901
 			-11:00	-	NST	1967 Apr	# N=Nome
 			-11:00	-	BST	1983 Nov 30	# B=Bering
@@ -270,6 +281,7 @@ Zone Pacific/Midway	-11:49:28 -	LMT	1901
 # Now we turn to US areas that have diverged from the consensus since 1970.
 
 # Arizona mostly uses MST.
+#Updated Zone America/Phoenix 1997 Nov 19
 Zone America/Phoenix	-7:28:18 -	LMT	1883 Nov 18 12:00
 			-7:00	US	M%sT	1944 Jan  1 00:01
 			-7:00	-	MST	1944 Mar 17 00:01
@@ -288,6 +300,7 @@ Link America/Denver America/Shiprock
 
 # Southern Idaho and eastern Oregon switched four weeks late in 1974.
 # Zone	NAME		GMTOFF	RULES	FORMAT	[UNTIL]
+#Updated Zone America/Boise 1997 Nov 19
 Zone America/Boise	-7:44:49 -	LMT	1883 Nov 18 12:00
 			-8:00	US	P%sT	1923 May 13 2:00
 			-7:00	US	M%sT	1974
@@ -320,6 +333,7 @@ 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		GMTOFF	RULES	FORMAT	[UNTIL]
+#Updated Zone America/Indianapolis 1997 Nov 19
 Zone America/Indianapolis -5:44:38 - LMT 1883 Nov 18 12:00
 			-6:00	US	C%sT	1920
 			-6:00 Indianapolis C%sT	1942
@@ -340,6 +354,7 @@ 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		GMTOFF	RULES	FORMAT	[UNTIL]
+#Updated Zone America/Indiana/Marengo 1997 Nov 19
 Zone America/Indiana/Marengo -5:45:23 -	LMT	1883 Nov 18 12:00
 			-6:00	US	C%sT	1951
 			-6:00	Marengo	C%sT	1961 Apr 30 2:00
@@ -361,6 +376,7 @@ 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		GMTOFF	RULES	FORMAT	[UNTIL]
+#Updated Zone America/Indiana/Knox 1997 Nov 19
 Zone America/Indiana/Knox -5:46:30 -	LMT	1883 Nov 18 12:00
 			-6:00	US	C%sT	1947
 			-6:00	Starke	C%sT	1962 Apr 29 2:00
@@ -370,6 +386,7 @@ Zone America/Indiana/Knox -5:46:30 -	LMT	1883 Nov 18 12:00
 #
 # Switzerland County, Indiana, last observed DST in 1972.
 # Zone	NAME		GMTOFF	RULES	FORMAT	[UNTIL]
+#Updated Zone America/Indiana/Vevay 1997 Nov 19
 Zone America/Indiana/Vevay -5:40:16 -	LMT	1883 Nov 18 12:00
 			-6:00	US	C%sT	1954 Apr 25 2:00
 			-5:00	-	EST	1969
@@ -386,6 +403,7 @@ 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		GMTOFF	RULES	FORMAT	[UNTIL]
+#Updated Zone America/Louisville 1997 Nov 19
 Zone America/Louisville	-5:43:02 -	LMT	1883 Nov 18 12:00
 			-6:00	US	C%sT	1921
 			-6:00 Louisville C%sT	1942
@@ -422,6 +440,7 @@ Rule	Detroit	1948	only	-	Sep	lastSun	2:00	0	S
 Rule	Detroit	1967	only	-	Jun	14	2:00	1:00	D
 Rule	Detroit	1967	only	-	Oct	lastSun	2:00	0	S
 # Zone	NAME		GMTOFF	RULES	FORMAT	[UNTIL]
+#Updated Zone America/Detroit 1997 Nov 19
 Zone America/Detroit	-5:32:11 -	LMT	1905
 			-6:00	-	CST	1915 May 15 2:00
 			-5:00	-	EST	1942
@@ -438,6 +457,7 @@ 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		GMTOFF	RULES	FORMAT	[UNTIL]
+#Updated Zone America/Menominee 1997 Nov 19
 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
@@ -565,6 +585,7 @@ Rule	StJohns	1988	only	-	Apr	Sun>=1	2:00	2:00	DD
 Rule	StJohns	1989	max	-	Apr	Sun>=1	2:00	1:00	D
 # St John's has an apostrophe, but Posix file names can't have apostrophes.
 # Zone	NAME		GMTOFF	RULES	FORMAT	[UNTIL]
+#Updated Zone America/St_Johns 1997 Nov 19
 Zone America/St_Johns	-3:30:52 -	LMT	1884
 			-3:30:52 StJohns N%sT	1935 Mar 30
 			-3:30	StJohns	N%sT
@@ -574,6 +595,7 @@ Zone America/St_Johns	-3:30:52 -	LMT	1884
 
 # The name `Happy Valley-Goose Bay' is too long; use `Goose Bay'.
 # Zone	NAME		GMTOFF	RULES	FORMAT	[UNTIL]
+#Updated Zone America/Goose_Bay 1997 Nov 19
 Zone America/Goose_Bay	-4:01:40 -	LMT	1884 # Happy Valley-Goose Bay
 			-3:30:52 StJohns NST	1919
 			-3:30:52 -	NST	1935 Mar 30
@@ -633,8 +655,10 @@ Rule Halifax	1962	1986	-	Apr	lastSun	2:00	1:00	D
 Rule Halifax	1962	max	-	Oct	lastSun	2:00	0	S
 Rule Halifax	1987	max	-	Apr	Sun>=1	2:00	1:00	D
 # Zone	NAME		GMTOFF	RULES	FORMAT	[UNTIL]
+#Updated Zone America/Halifax 1997 Nov 19
 Zone America/Halifax	-4:14:24 -	LMT	1902 Jun 15
 			-4:00	Halifax	A%sT
+#Updated Zone America/Glace_Bay 1997 Nov 19
 Zone America/Glace_Bay	-3:59:48 -	LMT	1902 Jun 15
 			-4:00	Canada	A%sT	1953
 			-4:00	Halifax	A%sT	1954
@@ -681,15 +705,19 @@ Rule	Mont	1951	1956	-	Sep	lastSun	2:00	0	S
 Rule	Mont	1957	max	-	Oct	lastSun	2:00	0	S
 Rule	Mont	1987	max	-	Apr	Sun>=1	2:00	1:00	D
 # Zone	NAME		GMTOFF	RULES	FORMAT	[UNTIL]
+#Updated Zone America/Montreal 1997 Nov 19
 Zone America/Montreal	-4:54:16 -	LMT	1884
 			-5:00	Mont	E%sT
+#Updated Zone America/Thunder_Bay 1997 Nov 19
 Zone America/Thunder_Bay -5:57:00 -	LMT	1895
 			-5:00	Canada	E%sT	1970
 			-5:00	Mont	E%sT	1973
 			-5:00	-	EST	1974
 			-5:00	Canada	E%sT
+#Updated Zone America/Nipigon 1997 Nov 19
 Zone America/Nipigon	-5:53:04 -	LMT	1895
 			-5:00	Canada	E%sT
+#Updated Zone America/Rainy_River 1997 Nov 19
 Zone America/Rainy_River -6:17:56 -	LMT	1895
 			-6:00	Canada	C%sT
 
@@ -721,6 +749,7 @@ Rule	Winn	1966	1986	-	Apr	lastSun	2:00	1:00	D
 Rule	Winn	1966	max	-	Oct	lastSun	2:00	0	S
 Rule	Winn	1987	max	-	Apr	Sun>=1	2:00	1:00	D
 # Zone	NAME		GMTOFF	RULES	FORMAT	[UNTIL]
+#Updated Zone America/Winnipeg 1997 Nov 19
 Zone America/Winnipeg	-6:28:36 -	LMT	1887 Jul 16
 			-6:00	Winn	C%sT
 
@@ -781,9 +810,11 @@ 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		GMTOFF	RULES	FORMAT	[UNTIL]
+#Updated Zone America/Regina 1997 Nov 19
 Zone America/Regina	-6:58:36 -	LMT	1905 Sep
 			-7:00	Regina	M%sT	1960 Apr lastSun 2:00
 			-6:00	-	CST
+#Updated Zone America/Swift_Current 1997 Nov 19
 Zone America/Swift_Current -7:11:20 -	LMT	1905 Sep
 			-7:00	Canada	M%sT	1946 Apr lastSun 2:00
 			-7:00	Regina	M%sT	1950
@@ -812,6 +843,7 @@ Rule	Edm	1972	1986	-	Apr	lastSun	2:00	1:00	D
 Rule	Edm	1972	max	-	Oct	lastSun	2:00	0	S
 Rule	Edm	1987	max	-	Apr	Sun>=1	2:00	1:00	D
 # Zone	NAME		GMTOFF	RULES	FORMAT	[UNTIL]
+#Updated Zone America/Edmonton 1997 Nov 19
 Zone America/Edmonton	-7:33:52 -	LMT	1906 Sep
 			-7:00	Edm	M%sT
 
@@ -833,8 +865,10 @@ Rule	Vanc	1947	1961	-	Sep	lastSun	2:00	0	S
 Rule	Vanc	1962	max	-	Oct	lastSun	2:00	0	S
 Rule	Vanc	1987	max	-	Apr	Sun>=1	2:00	1:00	D
 # Zone	NAME		GMTOFF	RULES	FORMAT	[UNTIL]
+#Updated Zone America/Vancouver 1997 Nov 19
 Zone America/Vancouver	-8:12:28 -	LMT	1884
 			-8:00	Vanc	P%sT
+#Updated Zone America/Dawson_Creek 1997 Nov 19
 Zone America/Dawson_Creek -8:00:56 -	LMT	1884
 			-8:00	Canada	P%sT	1947
 			-8:00	Vanc	P%sT	1972 Aug 30 2:00
@@ -868,20 +902,27 @@ Rule	NT_YK	1980	1986	-	Apr	lastSun	2:00	1:00	D
 Rule	NT_YK	1980	max	-	Oct	lastSun	2:00	0	S
 Rule	NT_YK	1987	max	-	Apr	Sun>=1	2:00	1:00	D
 # Zone	NAME		GMTOFF	RULES	FORMAT	[UNTIL]
+#Updated Zone America/Pangnirtung 1997 Nov 19
 Zone America/Pangnirtung -4:22:56 -	LMT	1884
 			-4:00	NT_YK	A%sT
+#Updated Zone America/Iqaluit 1997 Nov 19
 Zone America/Iqaluit	-4:33:52 -	LMT	1884	# Frobisher Bay
 			-5:00	NT_YK	E%sT
+#Updated Zone America/Rankin_Inlet 1997 Nov 19
 Zone America/Rankin_Inlet -6:08:40 -	LMT	1884
 			-6:00	NT_YK	C%sT
+#Updated Zone America/Yellowknife 1997 Nov 19
 Zone America/Yellowknife -7:37:24 -	LMT	1884
 			-7:00	NT_YK	M%sT
+#Updated Zone America/Inuvik 1997 Nov 19
 Zone America/Inuvik	-8:54:00 -	LMT	1884
 			-8:00	NT_YK	P%sT	1979 Apr lastSun 2:00
 			-7:00	NT_YK	M%sT
+#Updated Zone America/Whitehorse 1997 Nov 19
 Zone America/Whitehorse	-9:00:12 -	LMT	1900 Aug 20
 			-9:00	NT_YK	Y%sT	1966 Jul 1 2:00
 			-8:00	NT_YK	P%sT
+#Updated Zone America/Dawson 1997 Nov 19
 Zone America/Dawson	-9:17:40 -	LMT	1900 Aug 20
 			-9:00	NT_YK	Y%sT	1973 Oct 28 0:00
 			-8:00	NT_YK	P%sT
@@ -992,6 +1033,7 @@ Rule	BajaN	1950	1966	-	Apr	lastSun	2:00	1:00	D
 Rule	BajaN	1950	1961	-	Sep	lastSun	2:00	0	S
 Rule	BajaN	1961	1966	-	Oct	lastSun	2:00	0	S
 # Zone	NAME		GMTOFF	RULES	FORMAT	[UNTIL]
+#Updated Zone America/Mexico_City 1997 Nov 19
 Zone America/Mexico_City -6:36:36 -	LMT	1922 Jan  1  0:23:24
 			-7:00	-	MST	1927 Jun 10 23:00
 			-6:00	-	CST	1930 Nov 15
@@ -999,6 +1041,7 @@ Zone America/Mexico_City -6:36:36 -	LMT	1922 Jan  1  0:23:24
 			-6:00	-	CST	1931 Oct
 			-7:00	-	MST	1932 Mar 30 23:00
 			-6:00	Mexico	C%sT
+#Updated Zone America/Mazatlan 1997 Nov 19
 Zone America/Mazatlan	-7:05:40 -	LMT	1921 Dec 31 23:54:20
 			-7:00	-	MST	1927 Jun 10 23:00
 			-6:00	-	CST	1930 Nov 15
@@ -1009,6 +1052,7 @@ Zone America/Mazatlan	-7:05:40 -	LMT	1921 Dec 31 23:54:20
 			-7:00	-	MST	1949 Jan 14
 			-8:00	-	PST	1970
 			-7:00	Mexico	M%sT
+#Updated Zone America/Tijuana 1997 Nov 19
 Zone America/Tijuana	-7:48:04 -	LMT	1922 Jan  1  0:11:56
 			-8:00	-	PST	1927 Jun 10 23:00
 			-7:00	-	MST	1930 Nov 16
@@ -1017,6 +1061,7 @@ Zone America/Tijuana	-7:48:04 -	LMT	1922 Jan  1  0:11:56
 			-8:00	BajaN	P%sT	1967 Apr lastSun 2:00
 			-8:00	US	P%sT	1996
 			-8:00	Mexico	P%sT
+#Updated Zone America/Ensenada 1997 Nov 19
 Zone America/Ensenada	-7:46:28 -	LMT	1922 Jan  1  0:13:32
 			-8:00	-	PST	1927 Jun 10 23:00
 			-7:00	-	MST	1930 Nov 16
@@ -1032,11 +1077,13 @@ Zone America/Ensenada	-7:46:28 -	LMT	1922 Jan  1  0:13:32
 
 # Anguilla
 # Zone	NAME		GMTOFF	RULES	FORMAT	[UNTIL]
+#Updated Zone America/Anguilla 1997 Nov 19
 Zone America/Anguilla	-4:12:16 -	LMT	1912 Mar 2
 			-4:00	-	AST
 
 # Antigua and Barbuda
 # Zone	NAME		GMTOFF	RULES	FORMAT	[UNTIL]
+#Updated Zone America/Antigua 1997 Nov 19
 Zone	America/Antigua	-4:07:12 -	LMT	1912 Mar 2
 			-5:00	-	EST	1951
 			-4:00	-	AST
@@ -1047,6 +1094,7 @@ Rule	Bahamas	1964	max	-	Oct	lastSun	2:00	0	S
 Rule	Bahamas	1964	1986	-	Apr	lastSun	2:00	1:00	D
 Rule	Bahamas	1987	max	-	Apr	Sun>=1	2:00	1:00	D
 # Zone	NAME		GMTOFF	RULES	FORMAT	[UNTIL]
+#Updated Zone America/Nassau 1997 Nov 19
 Zone	America/Nassau	-5:09:24 -	LMT	1912 Mar 2
 			-5:00	Bahamas	E%sT
 
@@ -1058,6 +1106,7 @@ 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		GMTOFF	RULES	FORMAT	[UNTIL]
+#Updated Zone America/Barbados 1997 Nov 19
 Zone America/Barbados	-3:58:28 -	LMT	1924		# Bridgetown
 			-3:58	-	BMT	1932	  # Bridgetown Mean Time
 			-4:00	Barb	A%sT
@@ -1072,17 +1121,20 @@ Rule	Belize	1974	only	-	Feb	 9	0:00	0	S
 Rule	Belize	1982	only	-	Dec	18	0:00	1:00	D
 Rule	Belize	1983	only	-	Feb	12	0:00	0	S
 # Zone	NAME		GMTOFF	RULES	FORMAT	[UNTIL]
+#Updated Zone America/Belize 1997 Nov 19
 Zone	America/Belize	-5:52:48 -	LMT	1912 Apr
 			-6:00	Belize	C%sT
 
 # Bermuda
 # Zone	NAME		GMTOFF	RULES	FORMAT	[UNTIL]
+#Updated Zone Atlantic/Bermuda 1997 Nov 19
 Zone Atlantic/Bermuda	-4:19:04 -	LMT	1930 Jan  1 2:00    # Hamilton
 			-4:00	-	AST	1974 Apr 28 2:00
 			-4:00	Bahamas	A%sT
 
 # Cayman Is
 # Zone	NAME		GMTOFF	RULES	FORMAT	[UNTIL]
+#Updated Zone America/Cayman 1997 Nov 19
 Zone	America/Cayman	-5:25:32 -	LMT	1890		# Georgetown
 			-5:07	-	KMT	1912 Feb    # Kingston Mean Time
 			-5:00	-	EST
@@ -1102,6 +1154,7 @@ 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 Joses elsewhere, so we'll use `Costa Rica'.
 # Zone	NAME		GMTOFF	RULES	FORMAT	[UNTIL]
+#Updated Zone America/Costa_Rica 1997 Nov 19
 Zone America/Costa_Rica	-5:36:20 -	LMT	1890		# San Jose
 			-5:36	-	SJMT	1921 Jan 15 # San Jose Mean Time
 			-6:00	CR	C%sT
@@ -1149,12 +1202,14 @@ Rule	Cuba	1996	only	-	Oct	Sun>=1	0:00s	0	S
 Rule	Cuba	1997	max	-	Oct	Sun>=8	0:00s	0	S
 
 # Zone	NAME		GMTOFF	RULES	FORMAT	[UNTIL]
+#Updated Zone America/Havana 1997 Nov 19
 Zone	America/Havana	-5:29:28 -	LMT	1890
 			-5:30	-	HMT	1925 Jul 19 12:00 # Havana MT
 			-5:00	Cuba	C%sT
 
 # Dominica
 # Zone	NAME		GMTOFF	RULES	FORMAT	[UNTIL]
+#Updated Zone America/Dominica 1997 Nov 19
 Zone America/Dominica	-4:05:36 -	LMT	1911 Jul 1 0:01		# Roseau
 			-4:00	-	AST
 
@@ -1167,6 +1222,7 @@ Rule	DR	1970	only	-	Feb	21	0:00	0	S
 Rule	DR	1971	only	-	Jan	20	0:00	0	S
 Rule	DR	1972	1974	-	Jan	21	0:00	0	S
 # Zone	NAME		GMTOFF	RULES	FORMAT	[UNTIL]
+#Updated Zone America/Santo_Domingo 1997 Nov 19
 Zone America/Santo_Domingo -4:39:36 -	LMT	1890
 			-4:40	-	SDMT	1933 Apr  1 12:00 # S. Dom. MT
 			-5:00	DR	E%sT	1974 Oct 27
@@ -1178,16 +1234,19 @@ 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 we'll use `El Salvador'.
 # Zone	NAME		GMTOFF	RULES	FORMAT	[UNTIL]
+#Updated Zone America/El_Salvador 1997 Nov 19
 Zone America/El_Salvador -5:56:48 -	LMT	1921		# San Salvador
 			-6:00	Salv	C%sT
 
 # Grenada
 # Zone	NAME		GMTOFF	RULES	FORMAT	[UNTIL]
+#Updated Zone America/Grenada 1997 Nov 19
 Zone	America/Grenada	-4:07:00 -	LMT	1911 Jul	# St George's
 			-4:00	-	AST
 
 # Guadeloupe
 # Zone	NAME		GMTOFF	RULES	FORMAT	[UNTIL]
+#Updated Zone America/Guadeloupe 1997 Nov 19
 Zone America/Guadeloupe	-4:06:08 -	LMT	1911 Jun 8	# Pointe a Pitre
 			-4:00	-	AST
 
@@ -1200,6 +1259,7 @@ 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
 # Zone	NAME		GMTOFF	RULES	FORMAT	[UNTIL]
+#Updated Zone America/Guatemala 1997 Nov 19
 Zone America/Guatemala	-6:02:04 -	LMT	1918 Oct 5
 			-6:00	Guat	C%sT
 
@@ -1212,6 +1272,7 @@ Rule	Haiti	1983	1987	-	Oct	lastSun	0:00	0	S
 Rule	Haiti	1988	max	-	Apr	Sun>=1	1:00s	1:00	D
 Rule	Haiti	1988	max	-	Oct	lastSun	1:00s	0	S
 # Zone	NAME		GMTOFF	RULES	FORMAT	[UNTIL]
+#Updated Zone America/Port-au-Prince 1997 Nov 19
 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
@@ -1219,6 +1280,7 @@ Zone America/Port-au-Prince -4:49:20 -	LMT	1890
 # Honduras
 # Shanks says 1921 Jan 1; go with Whitman's more precise Apr 1.
 # Zone	NAME		GMTOFF	RULES	FORMAT	[UNTIL]
+#Updated Zone America/Tegucigalpa 1997 Nov 19
 Zone America/Tegucigalpa -5:48:52 -	LMT	1921 Apr
 			-6:00	Salv	C%sT
 
@@ -1232,6 +1294,7 @@ Zone America/Tegucigalpa -5:48:52 -	LMT	1921 Apr
 
 # From Shanks (1991):
 # Zone	NAME		GMTOFF	RULES	FORMAT	[UNTIL]
+#Updated Zone America/Jamaica 1997 Nov 19
 Zone	America/Jamaica	-5:07:12 -	LMT	1890		# Kingston
 			-5:07	-	KMT	1912 Feb    # Kingston Mean Time
 			-5:00	-	EST	1974 Jan 6 2:00
@@ -1240,6 +1303,7 @@ Zone	America/Jamaica	-5:07:12 -	LMT	1890		# Kingston
 
 # Martinique
 # Zone	NAME		GMTOFF	RULES	FORMAT	[UNTIL]
+#Updated Zone America/Martinique 1997 Nov 19
 Zone America/Martinique	-4:04:20 -      LMT	1890		# Fort-de-France
 			-4:04	-	FFMT	1911 May     # Fort-de-France MT
 			-4:00	-	AST	1980 Apr  6
@@ -1251,6 +1315,7 @@ Zone America/Martinique	-4:04:20 -      LMT	1890		# Fort-de-France
 # Recent volcanic eruptions have forced evacuation of Plymouth, the capital.
 # Luckily, Olveston, the current de facto capital, has the same longitude.
 # Zone	NAME		GMTOFF	RULES	FORMAT	[UNTIL]
+#Updated Zone America/Montserrat 1997 Nov 19
 Zone America/Montserrat	-4:08:52 -	LMT	1911 Jul 1 0:01   # Olveston
 			-4:00	-	AST
 
@@ -1261,6 +1326,7 @@ Rule	Nic	1979	1980	-	Jun	Mon>=23	0:00	0	S
 Rule	Nic	1992	only	-	Jan	1	4:00	1:00	D
 Rule	Nic	1992	only	-	Sep	24	0:00	0	S
 # Zone	NAME		GMTOFF	RULES	FORMAT	[UNTIL]
+#Updated Zone America/Managua 1997 Nov 19
 Zone	America/Managua	-5:45:08 -	LMT	1890
 			-5:45	-	MMT	1934 Jun 23  # Managua Mean Time
 			-6:00	-	CST	1973 May
@@ -1270,6 +1336,7 @@ Zone	America/Managua	-5:45:08 -	LMT	1890
 
 # Panama
 # Zone	NAME		GMTOFF	RULES	FORMAT	[UNTIL]
+#Updated Zone America/Panama 1997 Nov 19
 Zone	America/Panama	-5:18:08 -	LMT	1890
 			-5:20	-	PMT	1908 Apr 22   # Panama Mean Time
 			-5:00	-	EST
@@ -1277,6 +1344,7 @@ Zone	America/Panama	-5:18:08 -	LMT	1890
 # Puerto Rico
 # There are too many San Juans elsewhere, so we'll use `Puerto_Rico'.
 # Zone	NAME		GMTOFF	RULES	FORMAT	[UNTIL]
+#Updated Zone America/Puerto_Rico 1997 Nov 19
 Zone America/Puerto_Rico -4:24:25 -	LMT	1899 Mar 28 12:00    # San Juan
 			-4:00	-	AST	1942 May  3
 			-4:00	1:00	AWT	1945 Sep 30  2:00
@@ -1284,11 +1352,13 @@ Zone America/Puerto_Rico -4:24:25 -	LMT	1899 Mar 28 12:00    # San Juan
 
 # St Kitts-Nevis
 # Zone	NAME		GMTOFF	RULES	FORMAT	[UNTIL]
+#Updated Zone America/St_Kitts 1997 Nov 19
 Zone America/St_Kitts	-4:10:52 -	LMT	1912 Mar 2	# Basseterre
 			-4:00	-	AST
 
 # St Lucia
 # Zone	NAME		GMTOFF	RULES	FORMAT	[UNTIL]
+#Updated Zone America/St_Lucia 1997 Nov 19
 Zone America/St_Lucia	-4:04:00 -	LMT	1890		# Castries
 			-4:04	-	CMT	1912	    # Castries Mean Time
 			-4:00	-	AST
@@ -1296,12 +1366,14 @@ Zone America/St_Lucia	-4:04:00 -	LMT	1890		# Castries
 # St Pierre and Miquelon
 # There are too many St Pierres elsewhere, so we'll use `Miquelon'.
 # Zone	NAME		GMTOFF	RULES	FORMAT	[UNTIL]
+#Updated Zone America/Miquelon 1997 Nov 19
 Zone America/Miquelon	-3:44:40 -	LMT	1911 May 15	# St Pierre
 			-4:00	-	AST	1980 May
 			-3:00	Mont	PM%sT	# Pierre & Miquelon Time
 
 # St Vincent and the Grenadines
 # Zone	NAME		GMTOFF	RULES	FORMAT	[UNTIL]
+#Updated Zone America/St_Vincent 1997 Nov 19
 Zone America/St_Vincent	-4:04:56 -	LMT	1890		# Kingstown
 			-4:05	-	KMT	1912	   # Kingstown Mean Time
 			-4:00	-	AST
@@ -1315,16 +1387,19 @@ Rule	TC	1979	1986	-	Apr	lastSun	0:00	1:00	D
 Rule	TC	1979	max	-	Oct	lastSun	0:00	0	S
 Rule	TC	1987	max	-	Apr	Sun>=1	0:00	1:00	D
 # Zone	NAME		GMTOFF	RULES	FORMAT	[UNTIL]
+#Updated Zone America/Grand_Turk 1997 Nov 19
 Zone America/Grand_Turk	-4:44:32 -	LMT	1890
 			-5:07	-	KMT	1912 Feb    # Kingston Mean Time
 			-5:00	TC	E%sT
 
 # British Virgin Is
 # Zone	NAME		GMTOFF	RULES	FORMAT	[UNTIL]
+#Updated Zone America/Tortola 1997 Nov 19
 Zone America/Tortola	-4:18:28 -	LMT	1911 Jul    # Road Town
 			-4:00	-	AST
 
 # Virgin Is
 # Zone	NAME		GMTOFF	RULES	FORMAT	[UNTIL]
+#Updated Zone America/St_Thomas 1997 Nov 19
 Zone America/St_Thomas	-4:19:44 -	LMT	1911 Jul    # Charlotte Amalie
 			-4:00	-	AST