Usage note
今日表示今天，比较正式。
jīn rì biǎo shì jīn tiān， bǐ jiào zhèng shì。
今日 means today, in a more formal style.
Context note
今日常用于新闻、标题和书面语。
jīn rì cháng yòng yú xīn wén 、 biāo tí hé shū miàn yǔ。
It is often used with news, headlines, and written language.
5 examples
今日天气很好。
jīn rì tiān qì hěn hǎo。
Today's weather is very good.
今日活动开始。
jīn rì huó dòng kāi shǐ。
Today's event begins.
今日请准时到达。
jīn rì qǐng zhǔn shí dào dá。
Please arrive on time today.
今日任务很多。
jīn rì rèn wu hěn duō。
There are many tasks today.
今日不见不散。
jīn rì bú jiàn bú sàn。
See you today.
5 mini stories
老师说，今日要完成作业。
lǎo shī shuō， jīn rì yào wán chéng zuò yè。
The teacher said homework should be finished today.
今日的新闻很重要。
jīn rì de xīn wén hěn zhòng yào。
Today's news is very important.
他今日心情很好。
tā jīn rì xīn qíng hěn hǎo。
He is in a very good mood today.
今日有考试，大家都很认真。
jīn rì yǒu kǎo shì， dà jiā dōu hěn rèn zhēn。
There is an exam today, so everyone is very serious.
今日之后，我们再继续。
jīn rì zhī hòu， wǒ men zài jì xù。
After today, we will continue again.
Mini dialogue
今日计划
A
今日你有什么安排？
Jīnrì nǐ yǒu shénme ānpái?
What plans do you have today?
B
今日我要去图书馆看书。
Jīnrì wǒ yào qù túshūguǎn kàn shū.
Today I want to go to the library to read.
今日天气
A
今日天气真好！
Jīnrì tiānqì zhēn hǎo!
The weather is really nice today!
B
是的，今日阳光很温暖。
Shì de, jīnrì yángguāng hěn wēnnuǎn.
Yes, the sunshine is very warm today.
Related words and contrasts
similar
今天
jīn tiān
today
今日 is more formal or written, while 今天 is used in everyday speech.
contrast
昨天
zuó tiān
yesterday
今日 means today, 昨天 means yesterday.
contrast
明天
míng tiān
tomorrow
今日 means today, 明天 means tomorrow.