Original: Some towns on the Eyre Highway in the south-east corner of Western Australia, from the South Australian border almost to Caiguna, use an unofficial time zone - Central Western Standard Time - which is 45 minutes ahead of the official Western Standard Time.
Simplified: Some towns on the Eyre Highway in the south-east corner of Western Australia, between  the South Australian border almost as far as Caiguna, use Central Western Standard Time. This is an unofficial time zone 45 minutes ahead of the official Western Australian time.