Australian time zones:

WDT - Western Daylight Time

Time zone offset: UTC + 9 hours

WDT is 9 hours ahead of Coordinated Universal Time (UTC)

Note that WDT is a daylight saving time/summer time zone. It is generally only used during the summer in the places listed below, during the winter WST is used instead

Time zone abbreviations: WDT, AWDT, WST

Full name is Western Daylight Time
WDT – (Australian) Western Summer Time (Alternative name for WDT)
AWDT – Australian Western Daylight Time (Alternative)
WST – Western Summer Time (Alternative - same abbreviation as for Western Standard Time)

Email time zone indicator: +0900

An email sent from someone in the WDT time zone will have the time zone listed as "+0900" in the headers of the email. (However, "+0900" does not have to be in WDT, as other time zones could have the same UTC offset).

For actual dates DST might be observed, look at the examples below

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Where and when is WDT observed?