"Sean B. Durkin" <sean@dataprocessors.com.au> writes:
Even when the context of Australia is known, EST/EST makes it impractical to record times in the local clock with the acronym.
Absolutely.
To be consistent with the treatment of other timezones, we should go with the closest thing to the official acronym, rather than the most popular one. I acknowledge that there is no legislatively official acronyms,
That may be, but there is at least one legislatively official phrase that uses "summer time" rather than "daylight time", so it'd be a bit odd for us to use an acronym ending in "DT". See the South Australian Daylight Saving Regulations 2006 <http://www.legislation.sa.gov.au/LZ/C/R/DAYLIGHT%20SAVING%20REGULATIONS%2020...> which says that it's called "South Australian summer time". Presumably the corresponding acronym would be "SAST". But nobody uses "SAST". The only reference I can find to "SAST" was <http://www.linuxsa.org.au/pipermail/linuxsa/1999-November/010423.html>, where Glen Turner notes this exact situation and basically says nobody uses "SAST". I'm not sure I'd use the Bureau of Metrology as an authority in this particular matter. Among other things <http://www.bom.gov.au/climate/averages/tables/dst_times.shtml> bluntly states "The Bureau of Meteorology does not have responsibility for managing Daylight Saving Time." What a mess, huh? I do sense that Australians may be drifting towards the AEST/AEDT style abbreviations, at least in Internet documents. See, for example: http://www.australia.gov.au/about-australia-13time Also, the Google query "ACDT site:gov.au" has about 50,800 hits, apparently because www.abc.gov.au's style guide now says to use "ACDT". In contrast, the query "CDT site:gov.au" has about 26,400 hits and "CST site:gov.au" has about 29,500 hits. So at least the federal government seems to somewhat prefer the ACDT abbreviation. This could well just be due to the style guide at one government news site, though, so I'm not inclined to say this survey is definitive. If Australians are actually switching to AEST/AEDT, at some point we'll probably have to change the tz database. Not at all sure it's there yet, though. The last time I suggested such a change, it was pretty controversial.