[tz] Australian Timezone Abbreviations (Daylight Savings Time)

[Clive D.W. Feather]

Random832 said:
>>>"There are three timezones across Australia.
>> Given that there seem to be at least five, this doesn't seem too reliable.
>
> How do you figure? Consider that in common layperson usage, "time zones" 
> only refers to the standard offset itself (and perhaps the basic name 
> Eastern/Central/Western), not whether/when daylight savings is in effect.

In winter, there are five common clock settings (including Lord Howe Island
and Eucla), while in summer there are six. Neither of those numbers feels
consistent with "three".

(Note that this is not like the continental USA, which only has four values
at any time of year, even if the boundaries shift around.)

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