David Nicholls’s One Day is a novel about the relationship between the book’s main characters, Emma and Dexter, which evolves over the course of almost two decades. The novel charts how Emma and Dexter form a friendship and eventually a marriage, exploring how both characters seek out different types of relationships at different points in their lives, with the recklessness and confusion of youth giving way to more stable relationships later in life. In many ways, the most significant moment of Dexter and Emma’s relationship is the day they first meet, which lingers in their minds for the rest of the novel. They meet at university, when they are young and passionate, but they’re also anxious because they don’t know what the future has in store. But because Dexter and Emma don’t know yet what they want out of a relationship, they struggle to recreate the magic of the night, either with each other or with the the various other people they form relationships with later in life. Because they don’t know what they want, Emma and Dexter struggle to communicate as openly as they once did, often losing contact for years at a time even as new forms of communication like the cell phone emerge.
Before marrying each other, Dexter and Emma each experiment with more stable relationships with other people. Emma lives for a couple years with her boyfriend Ian and even comes close to marrying him, though she doesn’t love him. Dexter marries Sylvie and has a child (Jasmine) with her, though he worries he doesn’t fit in with her old-fashioned, wealthy family. For both Dexter and Emma, these earlier relationships show that they are not yet ready to enter a new, more mature phase of their lives. Through these imperfect, misguided, and ultimately doomed relationships, they also learn the dangers staying in a relationship not based on love. Still, it is Dexter’s divorce that ultimately motivates him to reconnect with Emma romantically, showing how the characters learn from relationships that don’t last. Age and experience gives them more clarity about what to seek out in a relationship. When Emma dies, Dexter enters yet another new phase of his life and learns, like his father before him, how to live without a partner who was in his life for so many years. In One Day, Nicholls illustrates through Dexter and Emma how young relationships tend to be intense but lacking direction and meaning. As people grow up, however, they stand to gain a better sense of themselves and what they want in life, which can lead them to pursue relationships with more intention and self-awareness.
Relationships and Time ThemeTracker

Relationships and Time Quotes in One Day
‘I suppose the important thing is to make some sort of difference,’ she said. ‘You know, actually change something.’
‘What, like “change the world”, you mean?’
‘Not the whole entire world. Just the little bit around you.’
‘I think our moment passed some time ago.’
‘Ian, don’t do that,’ she said sharply.
‘What?’
‘Slip into your act. You don’t have to, you know.’
‘Dexter, I love you so much. So, so much, and I probably always will.’ Her lips touched his cheek. ‘I just don’t like you anymore. I’m sorry.’
Then, without quite knowing how it happened, Dexter finds that he has fallen in love, and suddenly life is one long mini-break.
A thick envelope of heavy lilac paper. Emma took it gingerly, and peered inside. The envelope was quilted with tissue paper and the invitation itself had hand-torn edges and seemed to be made of some sort of papyrus or parchment. ‘Now that—’ Emma balanced it like a table on her upturned fingertips ‘—that is what I call a wedding invitation.’
Suki is wealthy now and ever more bubbly and famous and loved by the public, and even though they never got on and had nothing in common, he feels nostalgia for his old girlfriend, and for the wild years of his late twenties when his photo was in the papers.
‘I thought I’d finally got rid of you.’
‘I don’t think you can,’ he said.
He unlocks the heavy padlock that holds down the metal shutters, already hot to the touch on this radiant summer’s morning. He pulls them up, unlocks the door and feels, what? Content? Happyish? No, happy. Secretly, and for the first time in many years, he is proud of himself.
‘Promise you won’t force me to have sex again.’
‘We grew up together.’
Then Emma Mayhew dies, and everything that she thought or felt vanishes and is gone forever.
‘So,’ said Emma. ‘What are we going to do with the day?’
Fun, fun, fun – fun is the answer. Keep moving and don’t allow yourself a moment to stop or look around or think because the trick is to not get morbid, to have fun and see this day, this first anniversary as – what?
‘Very nice,’ he allowed himself and they kept climbing towards the summit, wondering what would happen when they got there.
There’s a general sense, as in all the calls, that the worst of the storm has passed. Dexter will probably never speak to Ian Whitehead again and this is fine too, for both of them.
‘Beautiful day,’ he mumbles, ‘No rain today. Not yet.’
This is where it all begins. Everything starts here, today.
And then it was over. ‘So. I’ll see you around,’ he said, walking slowly backwards away from her.
‘I hope so,’ she smiled.
‘And I hope so too. Bye, Em.’
‘Bye, Dex.’
‘Goodbye.’
‘Goodbye. Goodbye.’