It's important to remember that Anne was not writing for publication when she kept her diary. It was her private outlet during a very difficult time.
Here's the breakdown:
* Anne started her diary in 1942 while in hiding with her family.
* The Franks were discovered and sent to concentration camps in 1944.
* Anne died in Bergen-Belsen in 1945, before the war ended.
* Otto Frank, the only member of his family to survive, returned to Amsterdam in 1945.
* He found Anne's diary and decided to publish it, hoping to share her story with the world.
So, while Anne wrote the diary during the war, her father only read it after the war was over.