Number + 点
When used as a noun, 点 (diǎn) can mean "o'clock" when telling time, or "point" in a more general sense. For telling time, it follows a number directly: 三点 means "three o'clock." It is one of the first words learners encounter when studying how to express time in Chinese.
现在是下午三点,会议马上开始。
xiànzài shì xiàwǔ sān diǎn, huìyì mǎshàng kāishǐ.
It's three o'clock in the afternoon now, and the meeting is about to start.
你几点下班?我六点。
nǐ jǐ diǎn xiàbān? wǒ liù diǎn.
What time do you get off work? I get off at six.
早上八点的时候,她已经到了办公室。
zǎoshang bā diǎn de shíhou, tā yǐjīng dàole bàngōngshì.
At eight in the morning, she had already arrived at the office.