Jeffery Day, as he was commonly known, was born in St. Ives, Huntingdonshire, one of four children born to George Dennis Day, a solicitor, and his wife Margaret Jane . He was educated at Sandroyd and Repton Schools.
Military career
Day joined the Royal Navy as a probationary flight sub-lieutenant, and was confirmed in the rank of flight sub-lieutenant on 21 August 1915. He received the Royal Aero Club Aviators' Certificate No. 1949 after flying a Caudron biplane at the Royal Naval Flying School, Eastchurch, on 2 October 1915. He was first stationed aboard the seaplane carrier, part of the Harwich Force, where he gained a reputation as a skilled and daring flyer, and was promoted to flight lieutenant on 31 December 1916. Day chafed at the lack of activity at Harwich, and gained a transfer to the light cruiser. Following her grounding in August 1917, he was posted to the experimental air station at RNAS Kingsnorth on the Isle of Grain. Day was already an experienced pilot when he joined No. 13 Squadron RNAS, based at Dunkirk, on 19 December 1917. Between 3 Januaryand 19 February 1918 he scored five victories while flying a Sopwith Camel. On 27 February, he was shot down in flames into the sea about 25 miles west of Dunkirk by a German seaplane. According to his commanding officer's report: A search was immediately launched, but no trace of him was found. Having no known grave, he is commemorated on the Chatham Naval Memorial, Kent, England.
Day began writing poetry during his spare time, initially humorous verses for his fellow officers in the style of W. S. Gilbert, but later, inspired by Rupert Brooke's The Old Vicarage, Grantchester, he began to compose longer serious poems. Only three of these; "On the Wings of the Morning", "An Airman's Dream" and part of "To My Brother", were published in his lifetime, the first in Cornhill, and the other two in The Spectator. "To My Brother" was inspired by the death of his older brother Dennis Ivor Day, who was serving as a second lieutenant in the Royal Field Artillery when he was shot by a sniper at Vermelles on 25 September 1915, finally dying from the injury on 7 October. Day's collected poems were published post-war, and two of his poems were anthologized in A Treasury of War Poetry, British and American Poems of the World War, 1914-1919, edited by George Herbert Clarke, and also in Cambridge Poets 1914-1920: an Anthology, compiled by Edward Davison, published in 1920.
