Question: When did the inspiration of Supermac service as Prime Minister of the United Kingdom?

full_context: Document 1: Supermac (cartoon): "Super-Mac" was a 1958 cartoon image of Harold Macmillan, which became an enduring nickname for him.
Document 2: Spuds MacKenzie: Spuds MacKenzie is a fictional dog character created for use in an extensive advertising campaign marketing Bud Light beer in the late 1980s. The Spuds MacKenzie mascot and campaign were created by a 23-year-old art director, Jon Moore. At the time he was working at Needham, Harper & Steers, a Chicago, Illinois, advertising agency. The dog first showed up in a Bud Light Super Bowl XXI ad in 1987. During the height of his popularity, large amounts of Spuds merchandise was available, such as plush toys and t-shirts.
Document 3: Timothy Bligh: Sir Timothy James Bligh, KBE, DSO, DSC* (2 September 1918 – 12 March 1969) was a British naval officer, civil servant and business executive, who served as Principal Private Secretary to two successive prime ministers, Harold Macmillan and Sir Alec Douglas-Home
Document 4: Keith Joseph: Keith Sinjohn Joseph, Baron Joseph, (17 January 1918 – 10 December 1994), known as Sir Keith Joseph, 2nd Baronet, for most of his political life, was a British barrister and politician. A member of the Conservative Party, he served in the Cabinet under four prime ministers: Harold Macmillan, Sir Alec Douglas-Home, Edward Heath and Margaret Thatcher. He was a key influence in the creation of what came to be known as "Thatcherism" and the subsequent decline of one-nation conservatism and the postwar consensus.
Document 5: Supersnipe: Supersnipe is a fictional character who appeared in a series of comic books published by Street & Smith from 1942 to 1949. Supersnipe was the imagined alter ego of Koppy McFad, "the boy with the most comic books in the world." He was created by writer-artist George Marcoux, who had previously assisted Percy Crosby on the comic strip Skippy.
Document 6: Che Guevara in popular culture: Appearances of Argentine Marxist revolutionary Che Guevara (1928–1967) in popular culture are common throughout the world. Although during his lifetime he was a highly politicized and controversial figure, in death his stylized image has been transformed into a worldwide emblem for an array of causes, representing a complex mesh of sometimes conflicting narratives. Che Guevara's image is viewed as everything from an inspirational icon of revolution, to a retro and vintage logo. Most commonly he is represented by a facial caricature originally by Irish artist Jim Fitzpatrick and based on Alberto Korda's famous 1960 photograph titled "Guerrillero Heroico". The evocative simulacra abbreviation of the photographic portrait allowed for easy reproduction and instant recognizability across various uses. For many around the world, Che has become a generic symbol of the underdog, the idealist, the iconoclast, or the martyr. He has become, as author Michael Casey notes in "Che's Afterlife: The Legacy of an Image", "the quintessential postmodern icon signifying anything to anyone and everything to everyone."
Document 7: Seriously McDonalds: "Seriously McDonalds" is the name under which a viral photograph was spread in June 2011. The photograph shows a sign, which is in fact a hoax, claiming that McDonald's has implemented a new policy charging African-Americans more, as "an insurance measure". Despite having existed for some time, the picture was spread around the Internet, especially on Twitter, in June 2011, by people who were offended or amused by the photograph. McDonald's acted quickly to deny the legitimacy of the sign, but it continued to trend on Twitter under the hashtag "#SeriouslyMcDonalds" and "#seriouslymcdonalds" for a few days. The company's response to the hoax has received praise from journalists and public relations professionals.
Document 8: Conservative government, 1957–1964: The Conservative government of the United Kingdom that began in 1957 and ended in 1964 consisted of three ministries: the first Macmillan ministry, second Macmillan ministry, and then the Douglas-Home ministry. They were led by Harold Macmillan and Sir Alec Douglas-Home, who were appointed respectively by Queen Elizabeth II.
Document 9: Winston Churchill: Sir Winston Leonard Spencer-Churchill, {'1': ", '2': ", '3': ", '4': "} (30 November 187424 January 1965) was a British statesman, army officer, and writer. He served as Prime Minister of the United Kingdom from 1940 to 1945 and again from 1951 to 1955. As a Member of Parliament (MP), he represented five constituencies over the course of his career. As Prime Minister, Churchill led Britain to victory during World War II. He led the Conservative Party for fifteen years from 1940 to 1955.
Document 10: Harold Macmillan: Maurice Harold Macmillan, 1st Earl of Stockton, {'1': ", '2': ", '3': ", '4': "} (10 February 1894 – 29 December 1986) was a British statesman of the Conservative Party who served as Prime Minister of the United Kingdom from 1957 to 1963. Nicknamed "Supermac", he was known for his pragmatism, wit and unflappability.
Document 11: Anthony Eden: Robert Anthony Eden, 1st Earl of Avon, (12 June 1897 – 14 January 1977) was a British Conservative politician who served three periods as Foreign Secretary and then a relatively brief term as Prime Minister of the United Kingdom from 1955 to 1957.
Document 12: David Faber (politician): David James Christian Faber (born 7 July 1961) was a Conservative member of the Parliament of the United Kingdom, then an author, before in 2010 being appointed as head master of Summer Fields School, Oxford. He is the grandson of the late former Conservative Prime Minister Harold Macmillan (1894–1986).
Document 13: Mac Wiseman: Malcolm B. Wiseman (born May 23, 1925), better known as Mac Wiseman, is an American bluegrass singer, nicknamed The Voice with a Heart. The bearded singer is one of the iconic figures of bluegrass.
Document 14: École secondaire Macdonald-Cartier: École secondaire Macdonald-Cartier, in Sudbury, Ontario, opened its doors in 1969. École secondaire Macdonald-Cartier was the second public high school French language in Ontario to offer free education to all young francophones.The school is often referred to as Mack-Jack, even though the school wasn't named after Jacques Cartier. The school was actually named after two of the fathers of Canadian Confederation, Sir John A. Macdonald (1815-1891) and Sir George-Étienne Cartier (1814-1873).
Document 15: John Major: Sir John Major, {'1': ", '2': ", '3': ", '4': "} (born 29 March 1943) is a British politician who was Prime Minister of the United Kingdom and Leader of the Conservative Party from 1990 to 1997. He served as Foreign Secretary and then Chancellor of the Exchequer in the Thatcher Government from 1989 to 1990, and was the Member of Parliament (MP) for Huntingdon from 1979 until he retired in 2001. Since Margaret Thatcher's death in 2013, he is the oldest living former Prime Minister.
ground_truth: 1957 to 1963