Anne Frank (begins her diary 14 June 1942)
Anne Frank received a diary as a birthday present on 12 June 1942. Two days later, on Sunday, 14 June, she recorded her first entry, noting that the first present she opened was the empty diary, "the nicest of all" her presents.
The last entry in her diary was made on 1 August 1944.
(Many sources online indicate that Frank began her diary on 12 June, the day of her birthday. But if you look at the entry, she begins writing two days later, on Sunday, the 14th of June..)