It is an April Fools Joke, the article ends with "Today’s date is April 1."

Best regards,
Steffen Thorsen - timeanddate.com

On 01/04/2018 18:45 , Paul Eggert wrote:
 Today the Guardian Express of Perth reported that the government of 
 Western Australia has decided to advance the clocks permanently from 
 +0800 to +0900 on January 1, 2019. Presumably the time will still be 
 called Australian Western Standard Time (AWST), as it will still 
 differ by 30 minutes from ACST (+0930). For now, I suppose we should 
 guess that Australia/Eucla will simultaneously switch from +0845 to 
 +0915 so as to stay halfway between AWST and ACST.

 Daylight saving coming to WA in 2019. Guardian Express. 2018-04-01. 
 https://www.communitynews.com.au/guardian-express/news/exclusive-daylight-savings-coming-wa-summer-2018/