Question: When does the local government area established who's part is Wamberal, New South Wales?

Context paragraphs:
Gunning Shire: Gunning Shire was a local government area in New South Wales centered on Gunning, New South Wales north of the Australian Capital Territory until February 2004, when the local government organisation was absorbed into newly created Palerang Council and Upper Lachlan Shire.

Yanco Agricultural High School: Yanco Agricultural High School is a co-educational agricultural secondary school located in Yanco in the local government area of Leeton in south western New South Wales.  The school is one of four agricultural high schools in New South Wales which include Farrer Memorial Agricultural High School in Tamworth in northern New South Wales, James Ruse Agricultural High School in western Sydney and Hurlstone Agricultural High School in south-western Sydney.  The school was officially opened in March 1922 and is the only residential boarding school in New South Wales to have no day students.  The school serves the south of New South Wales and Victoria with the other schools serving the other regions of the state.  Yanco Agricultural High School is located approximately 10 kilometres from the Leeton CBD along Euroley Road.

Deniliquin Council: Deniliquin Shire was a local government area in the Riverina region of south-western New South Wales, Australia.  At the date of its abolition, Deniliquin Council was the last rural local government area in New South Wales left consisting only of a rural town.

Wamberal, New South Wales: Wamberal (pronounced: ) is a largely affluent coastal suburb of the Central Coast region of New South Wales, Australia, just north of Terrigal.  It is part of the Central Coast Council local government area and is located adjacent to the Wamberal Lagoon.

Unincorporated Far West Region: The Unincorporated Far West Region is an unincorporated area in the Far West region of New South Wales, Australia.  The area is one of only two areas in New South Wales that are not part of any local government area (the other is Lord Howe Island).  The region includes several small towns including Tibooburra, Milparinka and Silverton.  Silverton and Tibooburra have village councils.  The region surrounds Broken Hill, but does not include it, which is in the separate City of Broken Hill local government area.

Minister for Local Government (New South Wales): The New South Wales Minister for Local Government is a minister in the New South Wales Government and has responsibilities which includes all local government areas and related legislation in New South Wales, the most primary of which is the "Local Government Act 1993".  The minister administers the portfolio through the Office of Local Government, an agency of the NSW Department of Planning and Environment.

Canterbury-Bankstown Council: The Canterbury-Bankstown Council is a local government area located in the south-western suburbs of Sydney, in New South Wales, Australia.  The council was formed on 12 May 2016 from a merger of the City of Canterbury and the City of Bankstown, after a review of local government in New South Wales by the state government.

Central Darling Shire: Central Darling Shire is a local government area in the Far West region of New South Wales, Australia.  The Shire is located adjacent to the Barrier Highway.  Central Darling Shire was constituted in 1959 and at 53511 km2 , it is the largest incorporated local government area in New South Wales.

Municipality of Erskineville: The Municipality of Erskineville was a local government area of Sydney, New South Wales, Australia.  The municipality was proclaimed as the "Municipal District of Macdonald Town" on 23 May 1872 and, with an area of 0.8 square kilometres, was one of the smallest local government areas in Sydney and included the modern suburb of Erskineville, part of Eveleigh and the locality of Macdonaldtown.  The council was amalgamated, along with most of its neighbours, with the City of Sydney to the north with the passing of the "Local Government (Areas) Act 1948".  From 1968 to 1982 and from 1989 to 2004, the area was part of the South Sydney councils, with the former Town Hall serving as its council chambers.

Central Coast Council, New South Wales: The Central Coast Council is a local government area serving the Central Coast region of New South Wales, Australia, established on 12 May 2016 following the amalgamation of Gosford City and Wyong Shire councils.

Supporting paragraphs: Wamberal, New South Wales Central Coast Council, New South Wales
Answer: 12 May 2016