[2] Day played football for Malvern and appeared in the Second XI cricket team.
[1] Day enlisted at the start of World War I joining the Royal Fusiliers in September 1914, initially as a private in the 18th (Public Schools) Battalion.
[3][4] He was commissioned as Second Lieutenant in July 1915 and served on the Western Front in France with 17th Battalion, Royal Fusiliers from April 1916.
[3] He was invalided to the UK to recuperate and in January 1917 was attached to the Inland Waterways Division of the Royal Engineers.
[6] He made his highest score of 45 not out against Worcestershire in 1923, an innings which secured the match for Kent.