Usage note
到期表示时间到了，期限结束。
dào qī biǎo shì shí jiān dào le， qī xiàn jié shù。
到期 means the due date has arrived or the期限 has ended.
Context note
到期常用于证件、票、合同和食物。
dào qī cháng yòng yú zhèng jiàn 、 piào 、 hé tong hé shí wù。
It is often used with documents, tickets, contracts, and food.
5 examples
这张票今天到期。
zhè zhāng piào jīn tiān dào qī。
This ticket expires today.
证件快到期了。
zhèng jiàn kuài dào qī le。
The document is about to expire.
合同已经到期。
hé tong yǐ jīng dào qī。
The contract has already expired.
牛奶到期了吗？
niú nǎi dào qī le ma？
Has the milk expired?
请在到期前使用。
qǐng zài dào qī qián shǐ yòng。
Please use it before it expires.
5 mini stories
老师提醒大家检查到期日期。
lǎo shī tí xǐng dà jiā jiǎn chá dào qī rì qī。
The teacher reminded everyone to check the expiry date.
这本借书快到期了，要快点还。
zhè běn jiè shū kuài dào qī le， yào kuài diǎn hái。
This borrowed book is almost due, so return it soon.
他发现会员卡已经到期。
tā fā xiàn huì yuán kǎ yǐ jīng dào qī。
He found that the membership card had expired.
到期前两天，系统会提醒你。
dào qī qián liǎng tiān， xì tǒng huì tí xǐng nǐ。
The system will remind you two days before expiry.
妈妈把到期的食物扔掉了。
mā ma bǎ dào qī de shí wù rēng diào le。
Mom threw away the expired food.
Mini dialogue
牛奶快到期了
A
这瓶牛奶快到期了，今天要喝完。
Zhè píng niúnǎi kuài dào qī le, jīntiān yào hē wán.
This bottle of milk is about to expire, we need to finish it today.
B
好的，我们一起喝吧。
Hǎo de, wǒmen yīqǐ hē ba.
Okay, let's drink it together.
借书卡到期
A
我的借书卡到期了，不能借书了。
Wǒ de jièshū kǎ dào qī le, bù néng jiè shū le.
My library card has expired, I can't borrow books.
B
没关系，我陪你去续期。
Méi guānxi, wǒ péi nǐ qù xù qī.
No worries, I'll go with you to renew it.
Related words and contrasts
similar
过期
guò qī
to be overdue; past the expiry date
到期 means reaching the deadline; 过期 means already past the deadline.
related
截止
jié zhǐ
to close; cut-off
截止 is often used for deadlines, like registration closing.