《Everything Has Changed》的歌词和简谱由泰勒·斯威夫特和艾德·希兰共同编写，歌曲的音乐製作由布奇·沃克负责。歌曲的初始版本由泰勒·斯威夫特用小吉他完成，歌曲的歌词内容创作于泰勒·斯威夫特家的后院。在创作过程中，泰勒和艾德曾达不到共识，这主要是因为艾德在歌曲中加入了“I just want to know you better，know you better，know you better now”这段歌词，而泰勒·斯威夫特则想把这段歌词删去，但泰勒·斯威夫特最终还是选择妥协，并採纳了艾德·希兰的建议。

All I knew this morning when I woke

Is I know something now, know something now I didn't before

And all I've seen since 18 hours ago

Is green eyes and freckles

And your smile in the back of my mind making me feel like

I just want to know you better, know you better, know you better now

I just want to know you better, know you better, know you better now

I just want to know you better, know you better, know you better now

I just want to know you, know you, know you...

Cause all I know is we said hello

And your eyes look like coming home

All I know is a simple name

Everything has changed

All I know is you held the door

You'll be mine and I'll be yours

All I know since yesterday

Is everything has changed

And all my walls stood tall, painted blue

I'll take 'em down, take 'em down

And open up the door for you

And all I feel in my stomach is butterflies, the beautiful kind

Makin' up for lost time, takin' flight making me feel like

I just want to know you better, know you better, know you better now

I just want to know you better, know you better, know you better now

I just want to know you better, know you better, know you better now

I just want to know you, know you, know you...

Cause all I know is we said hello

And your eyes look like coming home

All I know is a simple name

Everything has changed

All I know is you held the door

You'll be mine and I'll be yours

All I know since yesterday

Is everything has changed

Come back and tell me why

I'm feeling like I've missed you all this time

And meet me there tonight

Let me know that it's not all in my mind

I just want to know you better, know you better, know you better now

I just want to know you, know you, know you...

Cause all I know is we said hello

And your eyes look like coming home

All I know is a simple name

Everything has changed

All I know is you held the door

You'll be mine and I'll be yours

All I know since yesterday

Is everything has changed

All I know is we said hello

So dust off your highest hopes

All I know is pouring rain

And everything has changed

All I know is a new found grace

All my days I'll know your face

All I know since yesterday

Is everything has changed

当我从今天的晨光中甦醒

我就察觉到了一些，从前所没有察觉到的事情

睁开眼就看到的是18小时前就在我身边的你

和那明亮的碧眸，可爱的雀斑，暖心的微笑

通通都印在我心，让我倍感安心

此刻我只想更靠近你，更了解你，更加能走近你心

此刻我只想更靠近你，更了解你，更加能走近你心

一点点靠近 一点点了解，一点点走近你心

一点点靠近，了解，一点点读懂眼前的你

我知道哪怕仅仅是一句简单的“你好”

你的眼神都能让我拥有回家般温暖的感受

哪怕只是简单唤声你的名字

一切皆变

我只知道我们的心门只为彼此而开

也终将只为彼此作伴

我知道从昨天开始，一切就已注定不同了

我曾将心墙高竖，并将心都涂成了忧郁的蓝

但此刻我愿意将它们一一推翻，将心门为你而开

我内心常忐忑不安，时而却又喜悦满怀

我们共同弥补从前的时光

敞开心门，一切都让我那幺心安

此刻我只想更靠近你，更了解你，更加能走近你心

此刻我只想更靠近你，更了解你，更加能走近你心

一点点靠近，一点点了解，一点点走近你心

一点点靠近，了解，一点点读懂眼前的你

因为我知道哪怕仅仅是一句简单的“你好”

你的眼神都能让我拥有回家般温暖的感受

哪怕只是简单唤声你的名字

一切皆变

我只知道我们的心门只为彼此而开

也终将只为彼此作伴

我知道从昨天开始，一切就已注定不同了

可否回到我身边，告诉我一切

我仿佛已无法停止对你的想念，噢，噢，噢

可否今晚就与我相见

让我知道你也有同样的感觉

我只想更靠近你，更了解你，更加能走近你心

一点点靠近，一点点了解，一点点读懂你 就在我眼前

我知道哪怕仅仅只是一句简单的“你好”

你的眼神都能让我拥有回家般温暖的感受

哪怕只是简单唤声你的名字

一切皆变

我只知道我们的心门只为彼此而开

也终将只为彼此作伴

我知道从昨天开始，一切就已注定不同了

只是那幺一句简单的“你好”

就能让你我心火重燃，希望浮现

仿佛一场倾盆大雨，一瞬间你我的世界就都已改变

生活的新光亮也出现在眼前

我知道我这一生都会铭记你的脸

我知道自昨天起，你我的世界就都已改变

《Everything Has Changed》给人一种温馨而又模糊不清的氛围，歌曲将“古旧”的乡村音乐拉入青少年的生活之中，让更多的年轻人听到这一音乐的淳朴形式；歌手在歌词中所描绘的故事，也正是所有美国青少年都在经历的内心与外部世界之变动。在风格上，该歌曲是一首标準的希南式小情歌，节奏明快、曲调清新，单纯的歌词书写一片芳心。

歌曲MV由菲利普·安德尔曼执导拍摄，拍摄地点选在美国洛杉矶的一所学校。MV的前部分的画面讲述着一对青梅竹马（小男孩和小女孩）的故事，他们互相用蜡笔在脸上涂画，扮演公主和骑士，并在学校体育馆跳交际舞。MV的镜头，泰勒·斯威夫特和艾德·希兰出现，接各自的孩子回家（泰勒扮演的是女孩的母亲，而艾德则扮演的是男孩的父亲）。