“One Day” is a novel by David Nicholls that follows the lives of two characters, Emma Morley and Dexter Mayhew, over 20 years. The story begins on July 15, 1988, the day they meet at their university graduation. Each chapter revisits their lives on the same date every year, exploring their evolving relationship and personal growth. The book delves into themes of love, friendship, and the passage of time. It highlights how life can change dramatically while remaining connected to a single person. “One Day” was also adapted into a film in 2011, starring Anne Hathaway and Jim Sturgess.