[tz] Missing entry for Heard Island and MacDonald Islands

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Hi everyone, I am a developer by trade, so I am not sure if I have stumbled onto some missing data in the tz database. I am accessing the database using PHP (www.php.net) which uses the latest version of the tz database (2012.3). I can use one of the built in functions to lookup timezone information for a given country using its ISO 3166-1 two letter country code (http://www.php.net/manual/en/datetimezone.listidentifiers.php). I am currently building an application and found that Heard Island and MacDonald Islands (ISO code HM) does not exist in the database. After a quick look at the tz data, I was also not able to find anything about Heard Island and MacDonald Island in the files. I believe that there should be an entry for Heard Island and MacDonald Islands (HM) which uses the timezone Australia/Perth. Is it possible that the entry was intentionally excluded for some reason? Or was it just missing from the database? Cheers,John  		 	   		  
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