This is WW2.
Port Phillip District was established as a separate colony.
The Nazi invasion of Poland on September 1st, 1939 was the first event of World War 2.
There is no Australian "cent" from 1939. Decimal currency was introduced in Australia in 1966.
Australian College of Optometry was created in 1939.
Australian Boys' Choir was created in 1939.
Australian marbled catshark was created in 1939.
The Western Australian Naturalist was created in 1939.
An Australian law involves the ability of a particular Comissioner may treat an event as not having happened or a non-event as having happened as they choose; see the related link. Many other laws can be considered just as stupid as this.
On October 15, 1939, New York City, NY opened LaGuardia Airport.
James Webb - Australian politician - died in 1939.
Second Australian Imperial Force was created in 1939.