According to the website, “The idea for National Donut Day began on the battlefields in France in World War I when Salvation Army workers served coffee and doughnuts to soldiers in the trenches.”
So does the Associated Press Stylebook, which outlines preferred spellings and references for journalists to use in news articles. A social analytics website, Topsy.com, showed that more people were using the hashtag #nationaldonutday than were using #nationaldoughnutday.