[tz] Asia/Shanghai error?

[Komka Péter]

Hi,


tzdata2024a contains (erroneously?):

# Zone	NAME		STDOFF	RULES	FORMAT	[UNTIL]
# Beijing time, used throughout China; represented by Shanghai.
		#STDOFF	8:05:43.2
Zone	Asia/Shanghai	8:05:43	-	LMT	1901
			8:00	Shang	C%sT	1949 May 28
			8:00	PRC	C%sT                 <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
# Xinjiang time, used by many in western China; represented by Ürümqi / Ürümchi
# / Wulumuqi.  (Please use Asia/Shanghai if you prefer Beijing time.)
Zone	Asia/Urumqi	5:50:20	-	LMT	1928
			6:00	-	+06


Shanghai refers to the rule "PRC".

# Rule	NAME	FROM	TO	-	IN	ON	AT	SAVE	LETTER/S
Rule	PRC	1986	only	-	May	 4	 2:00	1:00	D
Rule	PRC	1986	1991	-	Sep	Sun>=11	 2:00	0	S
Rule	PRC	1987	1991	-	Apr	Sun>=11	 2:00	1:00	D


Rule PRC was only in use until 1991.
Currently, in 2024, there is no rule "PRC" in use.
The local time Asia/Shanghai refers to a non-existing rule.


Possibly: Asia/Shanghai time currently (2024) has NO DST-rule. Similarly to Asia/Urumqi.
https://en.wikipedia.org/wiki/China  says: "Time zone	UTC+8 (CST) / DST is not observed."
https://www.timeanddate.com/worldclock/china  shows: there is [officially] only one time in China,
"CST", "UTC +8". Even is Ürümqi. 
https://www.timeanddate.com/time/change/china  (a sub-link from the previos link)
"Daylight Saving Time (DST) Not Observed in Year 2024"
"The previous DST change in China was on 15 September 1991."



-- 
Komka Peter
(please do not spam)