Five Hundred Year Diary The Five Hundred Year Diary was a journal kept by the Doctor . Further updates included the Nine Hundred Year Diary , ( TV : " Doctor Who " ) the Twelve Hundred Year Diary , ( TV : " The History of the Doctor " ) and the Two Thousand Year Diary . ( TV : " The Girl Who Died " ) History . The First Doctor began writing the diary whilst still on Gallifrey , but left it there when escaping with Susan . It was returned to him by his mentor K ' anpo Rimpoche , shortly before his first regeneration . ( PROSE : " The Three Paths " ) Following this regeneration , the Second Doctor got his diary out of his storage chest and began to read it , even while walking through the mercury swamps of Vulcan . ( TV : " The Power of the Daleks " ) The Doctor later checked his diary while on Telos to read up on a previous encounter with Cybermat s . ( TV : " The Tomb of the Cybermen " ) While on Earth , the Fourth Doctor checked his pockets for his diary , which contained notes he had made about the Sontaran s . ( TV : " The Sontaran Experiment " ) While on a planet made of confectionary , the Fourth Doctor checked the calendar in his diary and learned that it was K9 ' s birthday . ( PROSE : " " ) The Doctor would sometimes use his diary to check his history . The Fourth Doctor once used it as evidence to prove that he was never the phoney Second Doctor . ( AUDIO : " Survivors in Space " ) By the final time of his fifth incarnation , the Doctor confessed to Peri Brown he tried keeping a diary , not chronological , but " the trouble with time travel is one never seems to find the time " . ( TV : " The Caves of Androzani " ) He was still using the diary when Mel was his companion , referring to a note in it . ( PROSE : " Uranus " ) Before leaving the TARDIS , Ace took his Five Hundred Year Diary . ( PROSE : " The Death of Art " ) After this , it is unclear whether or not she gave it back to him or the Doctor had a spare . By the time he was travelling with Lucie Miller , the Eighth Doctor had the Five Hundred Year Diary in the TARDIS library . He used the book to pinpoint which species of alien was threatening Little Morton . He was able to correctly guess that he was dealing with a Quitoxin . ( AUDIO : " The Young Lions " ) Further diaries . The Fourth Doctor provided two volumes of his time log s to search for references to Traken . He hinted he was too busy to still keep track of his travels . ( TV : " The Keeper of Traken " ) The Seventh Doctor owned a Nine Hundred Year Diary shortly before his regeneration into the Eighth Doctor . ( TV : " Doctor Who " ) The Tenth Doctor had a psychic diary written on psychic paper . He explained to Christina that it held everything he saw and felt . The Doctor kept this diary on a desk in the TARDIS ' s library , but due to a cloud layer in the library ' s upper stacks , the desk was rained on no matter where it was placed . The Doctor was forced to use a saucepan to catch the rain so it didn ' t moulder the psychic paper and produce psychic mould and psychic mushroom s . ( PROSE : " Keeping up with the Joneses " ) The Eleventh Doctor kept a journal of the encounters he had with River Song . ( TV : " The Impossible Astronaut " et . al . ) The Eleventh Doctor had a Twelve Hundred Year Diary , which he and Clara read it when the Doctor forgot everything about himself . His memories were returned after reading the book . ( TV : " The History of the Doctor " ) The Twelfth Doctor owned a Two Thousand Year Diary which he used to remind himself of the Mire . ( TV : " The Girl Who Died " ) Other references . Scandrius , a Time Lord who idolised the Doctor , carried a Five Hundred Year Diary of his own which he wrote while briefly travelling with Tegan Jovanka in a TARDIS that he stole . ( AUDIO : " Time in Office " ) While pretending to be an incarnation of the Doctor , Mr Song disguised River Song ' s diary as a Five Hundred Year Diary . ( AUDIO : " Signs " ) Behind the scenes . The reference book " " states that Susan bought the Five Hundred Year Diary during her visit on Tiaanamat as a present for her grandfather .