Usage note
白天是指从日出到日落的时间，人们通常在这段时间工作或上学。
Báitiān shì zhǐ cóng rìchū dào rìluò de shíjiān, rénmen tōngcháng zài zhè duàn shíjiān gōngzuò huò shàngxué.
This word refers to the time from sunrise to sunset, when people usually work or go to school.
Context note
白天是指太阳出来以后到天黑之前的时间，我们通常在这个时间上学和玩耍。
Báitiān shì zhǐ tàiyáng chūlái yǐhòu dào tiān hēi zhīqián de shíjiān, wǒmen tōngcháng zài zhège shíjiān shàngxué hé wánshuǎ.
This word is used to talk about the time from sunrise until dark, when people are usually active with daily activities like school or play.
5 examples
今天白天天气很好
Jīntiān báitiān tǐqì hěn hǎo
The weather was very good today during the daytime.
我们下午去公园玩吧，白天人少。
Wǒmen xiàwǔ qù gōngyuán wán ba, báitiān rén shǎo.
Let's go to the park in the afternoon. There are fewer people during the daytime.
妈妈说白天要多喝水
Māma shuō báitiān yào duō kěshuǐ
Mom said we should drink more water during the daytime.
白天的时候，我们可以一起学习。
Báitiān de shíhòu, wǒmen kěyǐ yīqǐ xuéxí.
During the daytime, we can study together.
每天早上都是白天开始的。
Měinìng zǎoshang dōu shì báitiān kāishǐ de.
Every morning marks the start of the daytime.
5 mini stories
小明早上起床，白天开始学习。
Xiǎomíng zǎoshang qǐshàng, báitiān kāishǐ xuéxí.
Xiaoming gets up in the morning and starts studying during the daytime.
妈妈带小红去公园玩，白天人很多。
Māma dài xiǎohóng qù gōngyuán wán, báitiān rénduō.
Mom takes Xiaohong to the park to play. There are many people during the daytime.
小华白天去图书馆看书。
Xiǎohuá báitiān qù tóngshūguǎn kàn shū.
Xiaohua goes to the library to read books during the daytime.
爸爸在白天工作，晚上休息。
Dàba zài báitiān gōngzuò, wǎnshàng xiūxì.
Dad works during the daytime and rests in the evening.
小丽喜欢在白天画画。
Xiǎolì xǐhuān zài báitiān huà huà.
Xiaoli likes to draw pictures during the daytime.
Mini dialogue
喜欢的时间
A
你喜欢白天还是晚上？
Nǐ xǐhuan báitiān háishì wǎnshang?
Do you like daytime or nighttime?
B
我喜欢白天，可以出去玩。
Wǒ xǐhuan báitiān, kěyǐ chūqù wán.
I like daytime, I can go out to play.
睡觉时间
A
猫头鹰白天做什么？
Māotóuyīng báitiān zuò shénme?
What does an owl do in the daytime?
B
猫头鹰白天睡觉。
Māotóuyīng báitiān shuìjiào.
Owls sleep in the daytime.
Related words and contrasts
opposite
晚上
wǎnshang
nighttime
the opposite part of the day
related
上午
shàngwǔ
morning
a part of the daytime