Macau use of PRC

[Jesper Norgaard Welen]

In the asia file, there is a rule PRC defined which is used for quite a
number of timezones:

Rule	PRC	1986	only	-	May	 4	0:00	1:00
D
Rule	PRC	1986	1991	-	Sep	Sun>=11	0:00	0
S
Rule	PRC	1987	1991	-	Apr	Sun>=10	0:00	1:00
D

However, putting it to use in Macau seems superfluous since the PRC rule
is inactive since 1991, and it is implemented for Macau only in december
1999:

# Zone	NAME		GMTOFF	RULES	FORMAT	[UNTIL]
Zone	Asia/Macau	7:34:20 -	LMT	1912
			8:00	Macau	MO%sT	1999 Dec 20 # return to
China
			8:00	PRC	C%sT

Jesper Nørgaard Welen
Email: jnorgard at Prodigy.Net.mx	
Project Leader (Líder de Proyecto) Software
CIMMYT  -  Centro Internacional de Mejoramiento de Maíz y Trigo
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