According to the play, when does Anne receive her diary

Anne received her dairy as a present on her 13th birthday.

Explanation:

Annelies Marie famously known as 'Anne' frank was a German diarist who was fond of writing dairies and amongst of the Jewish victims during the time of Holocaust. Anne is mostly known for and have gained fame for the most renowned publication 'The Dairy of a Young Girl.

Anne Frank gifted herself a dairy on her 13th birthday and she used to write every small details about her life in hiding in that dairy. She used to address the diary as 'Dearest Kitty.' The diary also had a small closed lock.