But Culture and Leisure believe the correct date to be 1919.
'Many Guernsey men remained on active service into 1919, doing guard duties, clearing munitions and the navy remained in readiness at sea,' a spokesman said.
Historian Alan Marquis, who has spent 20 years building up a detailed record of Guernsey's part in the First World War, said: 'War, by definition begins when one nation invades territory of another and when killing and destruction commence.
'It ends when these atrocities cease – in this case August 1914 to November 1918.
'Politicians of course bear much responsibility for that awful conflict and argument on that continues to this day.
'So a politician could claim the war started in 1913, or 1912 when the slide into disaster became inevitable.
'On that basis I suppose, Culture and Leisure want politicians to be seen as having responsibility for war's end by concluding the signing of final declarations in June 1919.'
