Question: When did Bobby Sands' hunger strike end?

Context paragraphs:
1980–81 British Home Championship: The 1980-81 British Home Championship was the only British Home Nations international football championship, other than the years of the First World War and Second World War, which was not completed and thus failed to produce a winner.  As with the rugby union 1972 Five Nations Championship the cause of this cancellation was The Troubles in Northern Ireland.  The championship was scheduled to be played in May 1981 after the termination of the domestic season.  On 5 May, however, the Provisional Irish Republican Army hunger strike leader Bobby Sands died in the Maze Prison, invoking a storm of protest and violence by republicans in Northern Ireland.  Thus the English and Welsh FAs, whose teams were scheduled to travel to Windsor Park later in the month, declined to play, rendering the tournament incomplete and void.

Bobby Sands: Robert Gerard Sands (Irish: "Roibeárd Gearóid Ó Seachnasaigh" ; 9 March 19545 May 1981), commonly known as Bobby Sands, was an Irish member of the Provisional Irish Republican Army who died on hunger strike while imprisoned at HM Prison Maze.

Roll of Honour (song): Roll of Honour is an Irish Republican song, written by Gerry O'Glacain, that commemorates the 10 IRA and INLA hunger strikers who died during the 1981 Irish hunger strike in Northern Ireland.  The names each of the men are contained in the lyrics of the song in the order that they died: Bobby Sands, (Francis) Hughes, Ray McCreesh, (Patsy) O'Hara, Joe McDonnell, Martin Hurson, Kevin Lynch, Kieran Doherty, Thomas McElwee and Michael Devine.  The song describes the 10 as "Ireland’s bravest men" who were "Hungering for justice" and "For their rights as Irish soldiers and to free their native land".  The song ends with the call to "Fight on and make our homeland a nation once again".

Bobby Sands: 66 Days: Bobby Sands: 66 Days is a 2016 Irish documentary film about Bobby Sands and the 1981 Irish hunger strike.

Michael Fassbender filmography: Michael Fassbender is a German-Irish actor who made his screen debut in the 2001 war drama miniseries "Band of Brothers" as Sgt. Burton "Pat" Christenson.  Fassbender followed this with a number of television roles including a German motorcycle courier in the drama "Hearts and Bones" (2001), Guy Fawkes in the miniseries "Gunpowder, Treason & Plot" (2004), Lt. Harry Colebourn in the film "A Bear Named Winnie" (2004), and Azazeal in the series "Hex" (2004–05).  He made his film debut playing a Spartan soldier in Zack Snyder's "300" (2007).  The following year Fassbender portrayed Irish republican Bobby Sands during the events of the 1981 Irish hunger strike in Steve McQueen's historical drama "Hunger".  His performance garnered him the Best Actor award at the British Independent Film Awards, and the Irish Film and Television Awards.

Bessbrook landmine attack: The Bessbrook landmine attack happened on the 19 May 1981 during a period of heightened tension in Northern Ireland over the 1981 Irish hunger strike and the death of Bobby Sands MP on the 5 May.

Some Mother's Son: Some Mother's Son is a 1996 film written and directed by Irish filmmaker Terry George, co-written by Jim Sheridan, and based on the true story of the 1981 hunger strike in the Maze Prison, in Northern Ireland.  Provisional Irish Republican Army (IRA) prisoner Bobby Sands (played by John Lynch) led a protest against the treatment of IRA prisoners, claiming that they should be treated as prisoners of war rather than criminals.  The mothers of two of the strikers, played by Helen Mirren and Fionnula Flanagan, fight to save their sons' lives.  When the prisoners go on hunger strike and become incapacitated, the mothers must decide whether to abide by their sons' wishes, or to go against them and have them forcibly fed.

2013 California prisoner hunger strike: The 2013 California Prisoner Hunger Strike started on July 8, 2013 involving over 29,000 inmates in protest of the state's use of solitary confinement practices and ended on September 5, 2013.  The hunger strike was organized by inmates in long term solitary in the Security Housing Unit (SHU) at Pelican Bay State Prison in protest of inmates housed there that were in solitary confinement indefinnitely for having ties to gangs.  Another hunger strike that added to the movement started the week before in High Desert State Prison where the focus of their hunger strike was to demand cleaner facilities, better food and better access to the library.

1981 Irish hunger strike: The 1981 Irish hunger strike was the culmination of a five-year protest during The Troubles by Irish republican prisoners in Northern Ireland.  The protest began as the blanket protest in 1976, when the British government withdrew Special Category Status for convicted paramilitary prisoners.  In 1978, after a number of attacks on prisoners leaving their cells to "slop out", the dispute escalated into the dirty protest, where prisoners refused to leave their cells to wash and covered the walls of their cells with excrement.  In 1980, seven prisoners participated in the first hunger strike, which ended after 53 days.

The Spirit of Freedom: The Spirit of Freedom is an Irish folk music album by Christy Moore.  The album is notable for featuring two songs penned by Irish hunger striker Bobby Sands.  The songs "Back Home In Derry" and "McIlhatton" where written by Sands while in prison at Long Kesh.

Supporting paragraphs: The Spirit of Freedom 1981 Irish hunger strike
Answer: after 53 days