Tonga work

SCCS-file: australasia
SCCS-SID: 7.50

australasia

@@ -388,10 +388,15 @@ Zone	Pacific/Fakaofo	-11:24:56 -	LMT	1901
 			-10:00	-	TKT	# Tokelau Time
 
 # Tonga
+# Transition time is a guess--see below
+# Rule	NAME	FROM	TO	TYPE	IN	ON	AT	SAVE	LETTER/S
+Rule	Tonga	1999	max	-	Oct	Sat>=1	0:00	1:00	S
+Rule	Tonga	2000	max	-	Apr	Sat>=15	0:00	-	-
 # Zone	NAME		GMTOFF	RULES	FORMAT	[UNTIL]
 Zone Pacific/Tongatapu	12:19:20 -	LMT	1901
 			12:20	-	TOT	1941 # Tonga Time
-			13:00	-	TOT
+			13:00	-	TOT	1999
+			13:00	Tonga	TO%sT
 
 # Tuvalu
 # Zone	NAME		GMTOFF	RULES	FORMAT	[UNTIL]
@@ -1020,3 +1025,14 @@ Zone	Pacific/Wallis	12:15:20 -	LMT	1901
 # yet. By reading this article it seems like Fiji will be 14 hours ahead
 # of UTC as well, but as far as I know Fiji will only be 13 hours ahead
 # (12 + 1 hour DST).
+
+# From Arthur David Olson [arthur_david_olson@nih.gov] (1999-09-20):
+# According to <a href="http://www.tongaonline.com/news/sept1799.html>
+# http://www.tongaonline.com/news/sept1799.html
+# </a>:
+# "Daylight Savings Time will take effect on Oct. 2 through April 15, 2000 
+# and annually thereafter from the first Saturday in October through the 
+# third Saturday of April.  Under the system approved by Privy Council on 
+# Sept. 10, clocks must be turned ahead one hour on the opening day and 
+# set back an hour on the closing date."
+# Alas, no indication of the time of day.