Question: What year was "The Christmas Truce" during the World War I?

Context articles: Christmas truce
Christmas in the Trenches
Joyeux Noël
War Game (novel)
Bertie Felstead
Live and let live (World War I)
Alfred Anderson (veteran)
Burgfriedenspolitik
Sir Edward Hulse, 7th Baronet
The Truce (1997 film)

The Christmas truce (German: "Weihnachtsfrieden" ; French: "Trêve de Noël" ) refers to a series of widespread but unofficial ceasefires along the Western Front of World War I around Christmas 1914.
"Christmas in the Trenches" is a ballad from John McCutcheon's 1984 Album "Winter Solstice".
 It tells the story of the 1914 Christmas Truce between the British and German lines on the Western Front during the Great War from the perspective of a fictional British soldier.
 Although Francis Tolliver is a fictional character, the event depicted in the ballad is true.
 John McCutcheon met some of the German soldiers involved in this Christmas story when he toured in Denmark.
Joyeux Noël ('Merry Christmas') is a 2005 film about the World War I Christmas truce of December 1914, depicted through the eyes of French, [British, mostly Scottish]] and German soldiers.
 It was written and directed by Christian Carion.
 It was screened out of competition at the 2005 Cannes Film Festival.
War Game is a children's novel about World War I written and illustrated by Michael Foreman and published by Pavilion in 1993.
 It features four young English soldiers and includes football with German soldiers during the Christmas truce, "temporary relief from the brutal and seemingly endless struggle in the trenches".
Bertie Felstead (28 October 1894 – 22 July 2001) was a British soldier, World War I veteran and centenarian who gained fame at the end of his life as (or was believed so at the time to be) the last surviving soldier to have taken part in the Christmas truce of 1914.
Live and let live is the spontaneous rise of non-aggressive co-operative behaviour that developed during the First World War, particularly during prolonged periods of trench warfare on the Western Front.
 Perhaps one of the most famous examples of this is the Christmas Truce of 1914.
Alfred Anderson (25 June 1896 – 21 November 2005) was a Scottish joiner and veteran of the First World War.
 He was the last known holder of the 1914 Star (the Old Contemptibles), the last known combatant to participate in the 1914 World War I Christmas truce, Scotland's last known World War I veteran, and Scotland's oldest man for more than a year.
Burgfriedenspolitik (] )—literally "castle peace politics" but more accurately a political policy of "party truce" — is a German term used for the political truce the Social Democratic Party of Germany and the other political parties agreed to during World War I.
 The trade unions refrained from striking, the SPD voted for war credits in the Reichstag and the parties agreed not to criticize the government and its war.
 There were several reasons for the "Burgfrieden" politics: the Social Democrats believed it was their patriotic duty to support the government in war; they were afraid of government repression should they protest against the war; they feared living under an autocratic Russian Czar more than the German constitutional monarchy and its Kaiser; and they hoped to achieve political reforms after the war, including the abrogation of the inequitable three-class voting system, by cooperating with the government.
Sir Edward Hamilton Westrow Hulse, 7th Baronet (31 August 1889 – 12 March 1915) was an officer in the British Army during the First World War.
 He had his letters published posthumously detailing his account of the fighting on the Western Front, describing events such as the Christmas Truce.
The Truce (Italian: "La Tregua" ) is a 1997 film directed by Francesco Rosi, written by Tonino Guerra, based on Primo Levi's memoir, "The Truce".
 The film deals with Primo Levi's experiences returning to Italy in 1945 after the Red Army liberated the concentration camp at Auschwitz during the Second World War.
 This was Rosi's final film before his death in 2015.