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UTC+09:45 is an identifier for a time offset from UTC of +09:45.
UTC+09:45 had been used as a time in Australia (Central Western Summer Time, or CWST). It was used by some roadhouses along the Eyre Highway in Western Australia and South Australia during summer while Western Australia is on daylight saving time. Although it is not an official, government mandated timezone, the boundaries where it commences and ends are clearly defined and are usually shown on road maps of the area.
UTC+09:45 has been used in 5 places in Australia, including Border Village, Caiguna, Eucla, Madura and Mundrabilla. At the moment, these areas use UTC+08:45 because Western Australia does not use daylight saving time.