Eleventh Doctor's diary

The Eleventh Doctor, throughout his travels, kept several diaries. (TV:, , PROSE: ) The Twelfth Doctor also appeared to use the same diary as his previous incarnation. (PROSE: )

Due to their lives being full of "danger and fun", the Doctor only occasionally had opportunities to write in their diaries. (PROSE:, )

Appearance
One of the Eleventh Doctor's diaries closely resembled River Song's diary, a volume with a thick TARDIS blue cover with three rectangular panels and a Seal of Rassilon. (TV: ) Later, in his travels with Clara Oswald, he used a Twelve Hundred Year Diary, which was physically larger, with a mottled gold and textured surface, with an embossed plaque and corners. (TV: ) Another diary owned by the Eleventh Doctor had a spiral binding. (PROSE: )

History
In the 51st century, when River Song led her expedition party into the Library and met the Tenth Doctor and Donna Noble, she asked the Doctor to compare diaries, but, as the Doctor hadn't yet met River from his perspective, he hadn't yet been keep track of his and River's encounters. (TV: )

In 2011, when River, Amy Pond, and Rory Williams arrived in a diner following the Eleventh Doctor's supposed death and his earlier self meeting them in said diner, River and the Doctor compared diaries. (TV: )

Later, either the Eleventh or Twelfth Doctor wrote in their diary, recounting how: he and Clara Oswald continually saved each others' lives; how she jumped into his time stream to stop the Great Intelligence; how he had been forced to remember a dark secret from the Time War whilst saving Clara; how he, the War Doctor, and the Tenth Doctor teamed up to defeat the Daleks and save Gallifrey; and his protection of Trenzalore for several centuries, until he neared the end of his life but was granted a new regeneration cycle from the Time Lords after Clara's pleas. (PROSE: )

He also wrote how, after regeneration, he was justified to not have the usual "big, daft grin" after being swallowed by a rampaging dinosaur, galloping around on a horse, his organs being nearly been harvested, fighting a robot with half a face in a hot-air balloon made of skin, and having to deal with the issues Madame Vastra and her friends had been involved in. (PROSE: ) He also wrote about he was getting used to his eyebrows and Clara's shock at his transformation, and was remorseful for the dinosaur he accidentally brought with him. (PROSE: )

The Twelfth Doctor also wrote about Clara's want to not always travel with him so as to maintain her life and hold down a job at Coal Hill School, as well as his journey inside a Dalek with Clara. (PROSE: )

Behind the scenes

 * Although both The Doctor's Diary and First Day of the Doctor seem to, on face value, depict two different versions of the Twelfth Doctor's diary entry about the events of Deep Breath, it doesn't necessarily mean they contradict each other, as they could be two extracts from a larger, unseen diary entry. This is supported by both stories presenting the relevant portions on torn up pieces of paper taped into the Doctor's diary.