By the 17th century, jelly doughnuts were invented, although the the word “doughnut” was not used to describe them at the time. Jelly-Filled Doughnut Day is being observed today! It has always been observed annually on June 8th.
There are three other doughnut holidays, the origins of which are obscure. International Jelly-Filled Doughnut Day is widely recognized as June 8 (occasionally as June 9). National Cream-Filled Doughnut Day is celebrated on September 14 although there is also a National Boston Cream Pie Day observed October 23rd.