The official list of timezones for Australia, as provided by the Australian Government, does not include EST anywhere on the page. AEST is the correct abbreviation.
<quote url="http://www.australia.gov.au/about-australia-13time"> There are three times zones in Australia - * Australian Eastern Standard Time (AEST): Greenwich Mean Time (GMT) plus 10 hours for standard time and 11 hours for daylight savings time. AEST is followed in these regions: o New South Wales o Victoria o Queensland o Tasmania o Australian Capital Territory * Australian Central Standard Time (ACST): GMT plus 9 ½ hours for standard time and 10 ½ hours for daylight savings time. ACST is followed in these regions: o South Australia o Northern Territory * Australian Western Standard Time (AWST): GMT plus 8 hours. AWST is followed in these regions: o Western Australia </quote> This should be re-opened as a bug. Timeanddate.com do not have the most correct timezone information on their website, the Australian Government do. Regards, Tyson Clugg.