Title: All in a Day
Content:  All in a Day is a 1986 children's picture book by Mitsumasa Anno. It features illustrations by Anno and several other internationally known illustrators: Eric Carle, Raymond Briggs, Nicolai Ye. Popov, Akiko Hayashi, Gian Calvi, Leo and Diane Dillon, Zhu Chengliang and Ron Brooks.
Title: All Summer in a Day
Content:  "All Summer in a Day" is a science fiction short story by American writer Ray Bradbury, first published in the March 1954 issue of The Magazine of Fantasy & Science Fiction.
Title: All in a Day (radio show)
Content:  All in a Day is a Canadian radio program, the CBC Radio One regional afternoon program for Eastern Ontario. Produced at the studios of Ottawa's CBO-FM, it airs on all Radio One transmitters in Eastern Ontario and the Outaouais. The program is currently hosted by Alan Neal. Past hosts have included Fraser Cameron, Brent Bambury, Adrian Harewood and Ken Rockburn. The program airs from 3 to 6 p.m. on CBO's main transmitter in Ottawa, while its rebroadcasters air network programming for the first hour and then join All in a Day at 4 p.m.
Title: Day (Kennedy novel)
Content:  Day is a novel by A. L. Kennedy. It won the novel category and the overall Costa Book of the Year Award in the 2007 Costa Book Awards. The novel is about a man who was a tailgunner in a Lancaster bomber aircraft during World War II. Later, he is an extra in a film about prisoners of war.
Title: 2001 in Italian television
Content: Tutto in un giorno (All in a day) – documentary reconstructing relevant events (as the Genoa G8 summit) through the actions of four persons. 
Title: One Day (novel)
Content:  One Day is a novel by David Nicholls, published in 2009. Each chapter covers the lives of two protagonists on 15 July, St Swithin's Day, for 20 years. The novel attracted generally positive reviews and was named 2010 Galaxy Book of the Year. Nicholls adapted his book into a screenplay; the feature film, was released in August 2011.
Title: A Day in Summer
Content:  A Day in Summer is the first novel by J. L. Carr, published in 1963. It is the story of an RAF veteran named Peplow who arrives in the fictional village of Great Minden on the day of its annual Feast (or fair), seeking retribution for the death of his son. Carr started the novel as a part of written work for classes of the Workers' Educational Association and described it as his most technically ambitious novel, so it was "foolhardy to start with". Carr sent duplicate copies of the novel to publishers to consider, and it was accepted by both the seventh and eighth publishers he sent it to at the same time. The eventual publisher paid Carr an advance of 50 pounds for the novel. The novel has been reissued by The Quince Tree Press, the company established by Carr to publish his maps and small books. A film version was made in 1989, directed by Bob Mahoney from a screenplay by Alan Plater, and starring Peter Egan, Jack Shepherd, John Sessions, Jill Bennett, Ian Carmichael and Daragh O'Malley.
Title: Day (Wiesel novel)
Content:  Day, published in 1962, is the third book in a trilogy by Elie Wiesel—Night, Dawn, and Day—describing his experiences and thoughts during and after the Holocaust.
Title: The One Day
Content:  The One Day by Donald Hall is a book-length poem.
Title: One Day at a Time (novel)
Content:  One Day at a Time is a novel by Danielle Steel, published by Delacorte Press in February 2009. The book is Steel's seventy-seventh novel.

Question: Who is the author of All in a Day?
Answer: Mitsumasa Anno.