Question: Peter Woolcott, is an Australian public servant and diplomat and the designated Chief of Staff to the 29th, and current Prime Minister of Australia Malcolm Turnbull, commencing on which date?
Context: In Australia, the 457 visa was the most common visa for Australian or overseas employers to sponsor skilled overseas workers to work temporarily in Australia "(it is currently in the process of being abolished by the federal government led by Malcolm Turnbull)".  The full title of this subclass of visa was Temporary Business (Long Stay) and was introduced soon after John Howard became Prime Minister in 1996.  The title of the visa was changed to Temporary Work (Skilled) (Subclass 457) visa on 24 November 2012.  Applications are processed by the Department of Immigration and Border Protection (DIBP).  On 18 April 2017, Prime Minister Malcolm Turnbull announced that the 457 visas will be replaced with two new visa categories. Malcolm Bligh Turnbull (born 24 October 1954) is the 29th and current Prime Minister of Australia.  He first served as parliamentary leader of the Liberal Party and as opposition leader from 2008 to 2009, and became parliamentary leader and Prime Minister after defeating Tony Abbott at the 2015 Liberal leadership spill.  The Turnbull Government was re-elected at the 2016 federal election, but with only a one-seat majority. The Turnbull Government is the federal executive government of Australia, led by the 29th Prime Minister of Australia, Malcolm Turnbull.  The government is made of members of the Liberal-National Coalition.  The prime ministership of Malcolm Turnbull commenced on 15 September 2015, when he was sworn in by the Governor-General of Australia.  The Turnbull Government succeeded the Abbott Government, which was elected at the 2013 federal election.  Turnbull took office by challenging the incumbent Liberal leader Tony Abbott in an internal leadership ballot.  Warren Truss, the leader of the Nationals continued as Deputy Prime Minister, until he retired in 2016 and was replaced by Barnaby Joyce. Gregory Laurence Moriarty (born 4 April 1964) is a senior Australian public servant and diplomat, and the current Secretary of the Department of Defence since 4 September 2017.  He was previously the Chief of Staff to the Prime Minister of Australia Malcolm Turnbull.  Moriarty has been Australian Ambassador to Iran from 2005 to 2008, Australian Ambassador to Indonesia from 2010 to 2014, the inaugural Commonwealth Counter-Terrorism Coordinator from 2015 to 2016, and the International and National Security Adviser to the Prime Minister. The First Turnbull Ministry (Liberal–National Coalition) was the 70th ministry of the Government of Australia, led by Prime Minister Malcolm Turnbull.  It succeeded the Abbott Ministry after a leadership spill that took place on 14 September 2015 ended Prime Minister Tony Abbott's leadership of the Liberal Party of Australia.  On 15 September, the National Party confirmed, after successful negotiations, that it would continue a coalition agreement with the Liberal Party, guaranteeing the Turnbull Government a majority in the Australian House of Representatives. Andrew Leigh "Drew" Clarke {'1': ", '2': ", '3': ", '4': "} is a former senior Australian public servant who served as Secretary of several departments and as Chief of Staff to the 29th Prime Minister, Malcolm Turnbull, before his retirement in April 2017. Peter Woolcott {'1': ", '2': ", '3': ", '4': "} is an Australian public servant and diplomat and the designated Chief of Staff to Prime Minister of Australia Malcolm Turnbull commencing on the 4 September 2017.  Woolcott has served as the Australia's High Commissioner to New Zealand, the Australia’s Ambassador for the Environment, the Australian Permanent Representative to the United Nations in Geneva, the Australian Ambassador to Italy, the Deputy Head of Mission in Jakarta, and the Consul-General in Honolulu. Trevor Kennedy (born Trevor John Kennedy; born in Perth, Western Australia, on 24 June 1942) is an Australian businessman and company director.  He has served on the board of directors of many Australian companies, including Consolidated Press Holdings and Qantas.  He is a former journalist and right-hand man of Kerry Packer and a former business associate of Malcolm Turnbull, current leader of the Australian Parliamentary Liberal Party and the 29th Prime Minister of Australia. Frances Adamson (born 20 April 1961) is an Australian public servant and diplomat.  On 20 July 2016, she was appointed Secretary of the Department of Foreign Affairs and Trade (DFAT) by the Prime Minister of Australia Malcolm Turnbull; the first ever female Secretary to be appointed to the portfolio.  From 2015 to 2016 she was foreign policy advisor to Prime Minister Malcolm Turnbull and from 2011 to 2015 she was Australian Ambassador to China. Arthur Sinodinos {'1': ", '2': ", '3': ", '4': "} (born 25 February 1957 in Newcastle, New South Wales) is an Australian politician, the Liberal member of the Senate representing New South Wales since 2011, and the Minister for Industry, Innovation and Science in the Turnbull Government since January 2017.  Sinodinos has previously served as the Cabinet Secretary between September 2015 and January 2017, briefly as the acting Minister for Health and Aged Care and Acting Minister for Sport during January 2017; and was the Assistant Treasurer in the Abbott Ministry during 2013 and 2014.  He stepped aside from his ministerial duties during an investigation by the New South Wales Independent Commission Against Corruption (ICAC), although he still formally held the position until he officially resigned on 19 December 2014.  Prior to his appointment to the Senate, he was a senior public servant and investment banker.  He re-entered Cabinet as Cabinet Secretary on 21 September 2015 when he was appointed by Malcolm Turnbull.
Answer: 4 September 2017