Question: On what date was the party led by Jesse Feras Klaver founded?

Context paragraphs:
18th Saskatchewan Legislature: The 18th Legislative Assembly of Saskatchewan was elected in the Saskatchewan general election held in June 1975.  The assembly sat from November 12, 1975, to September 19, 1978.  The New Democratic Party (NDP) led by Allan Blakeney formed the government.  The Liberal Party led by David Steuart formed the official opposition.  Edward Malone replaced Steuart as party leader in 1976.  After the Progressive Conservative Party won two by-elections and convinced two Liberal members to defect in 1977, the Progressive Conservative Party led by Richard Lee Collver shared the role of official opposition with the Liberals.

GroenLinks: GroenLinks (] ; English: GreenLeft ) is a Dutch political party of green progressive bent.  It was formed on 1 March, 1989 as a merger of four left-wing parties: the Communist Party of the Netherlands, the Pacifist Socialist Party, the Political Party of Radicals and the Evangelical People's Party.  After disappointing results in the 1989 and 1994 general elections, the nascent party fared particularly well in the elections that took place between 1994 and 2002.  Then party leader Paul Rosenmöller was seen as the unofficial leader of the opposition against the Kok cabinet-led Purple governments by the media, fellow politicians and academics, even though it was only the second-largest party in the number of seats in the Dutch parliament's House of Representatives.

United Communist Party of India: United Communist Party of India (UCPI), is a political party in India.  It was formed in 1989 when Com Mohit Sen and Com Ramesh Sinha (both senior CPI leaders, who had decided to form a separate party) along with Indian Communist Party led by M. Kalyanasundarm, D. Pandian and SU.  Palanisamy; and All India Communist Party led by S.A. Dange and Roza Deshpande; and Communist Party of Punjab led Com.  Wadhawa Ram and Sukhinder Singh decided to merge their formations and called for national conference of communists.  The founding conference was held at Salem, Tamil Nadu in May 1989.  Delegates from Tamil Nadu, Andhra Pradesh, W. Bengal, Orissa, Assam, Bihar, Uttar Pradesh, Delhi, Himachal Pradesh, Punjab, Maharashtra, Goa and Kerala met and declared the formation of United Communist Party of India.  S.A Dange and Mohit Sen were elected Chairman and General-secretary respectively of the newly formed central committee.  S.A.Dange, Mohit Sen, Ramesh Sinha, Roza Deshpande, D. Pandian, K.M. Sundram, Sukhinder Singh, K. Manikam, Keshav Sachan and Shyam Narain Tiwari were elected as Political Committee members.  Veteran communist leader Mohit Sen was the general secretary of the party until his death in 2003.

Members of the Australian Senate, 1974–1975: This is a list of members of the Australian Senate from 1974 to 1975.  The 18 May 1974 election was a double dissolution of both Houses, with all 127 seats in the House of Representatives, and all 60 seats in the Senate up for election.  The incumbent Labor Party led by Prime Minister Gough Whitlam defeated the opposition Liberal Party led by Billy Snedden and their Coalition partner the Country Party led by Doug Anthony.

Australian federal election, 1934: Federal elections were held in Australia on 15 September 1934.  All 74 seats in the House of Representatives, and 18 of the 36 seats in the Senate were up for election.  The incumbent United Australia Party led by Prime Minister of Australia Joseph Lyons with coalition partner the Country Party led by Earle Page defeated the opposition Australian Labor Party led by James Scullin.  Labor's share of the primary vote fell to an even lower number than in the 1931 election due to the Lang Labor split, but it was able to pick up an extra four seats on preferences and therefore improve on its position.  The Coalition suffered an eight-seat swing, forcing Lyons to take the Country Party into his government (the UAP had governed alone in the previous term).

Australian federal election, 1972: Federal elections for the House of Representatives were held in Australia on 2 December 1972, and were won by the Australian Labor Party led by Gough Whitlam.  Labor won 67 of the 125 seats contested and defeated the Liberal Party led by Prime Minister William McMahon and Coalition partner the Country Party led by Doug Anthony.  The elections ended 23 years of successive Coalition governments which held power since 1949.

Australian federal election, 1937: Federal elections were held in Australia on 23 October 1937.  All 74 seats in the House of Representatives, and 19 of the 36 seats in the Senate were up for election.  The incumbent United Australia Party led by Prime Minister of Australia Joseph Lyons with coalition partner the Country Party led by Earle Page defeated the opposition Australian Labor Party led by John Curtin.

Australian federal election, 1943: Federal elections were held in Australia on 21 August 1943.  All 74 seats in the House of Representatives, and 19 of the 36 seats in the Senate were up for election.  The incumbent Australian Labor Party led by Prime Minister of Australia John Curtin defeated the opposition Country Party led by Arthur Fadden and coalition partner the United Australia Party led by Billy Hughes.

Jesse Klaver: Jesse Feras Klaver (born 1 May 1986) is a Dutch politician.  He has been a member of the House of Representatives since 2010, and he has served as leader of the GroenLinks party since 12 May 2015.  Prior to this, he had also been chair of the youth union of the Christelijk Nationaal Vakverbond.

United Kingdom general election, 1959: This United Kingdom general election was held on 8 October 1959.  It marked a third consecutive victory for the ruling Conservative Party, now led by Harold Macmillan.  The Conservatives increased their overall majority again, to 101 seats over the Labour Party led by Hugh Gaitskell and the Liberal Party led by Jo Grimond.  It is to date the only occasion since the Second World War when a government has managed to increase its overall majority whilst seeking a third term in government.  However, despite this success, the Conservatives failed to win the most seats in Scotland, and have not done so since; this marks the beginning of Labour's domination of Scottish seats at Westminster, which lasted until the rise of the Scottish National Party at the 2015 general election.  Both future Liberal leader Jeremy Thorpe and future Conservative leader and eventual Prime Minister Margaret Thatcher first entered Parliament at this election.

Supporting paragraphs: Jesse Klaver GroenLinks
Answer: 1 March, 1989