Number + 点
The word 点 (diǎn) is used after a number to express the hour in telling time, equivalent to 'o'clock' in English. For example, 三点 means 'three o'clock' and 下午两点 means '2 PM.' It is the standard way to state the time in Chinese.
现在是下午三点,该开会了。
Xiànzài shì xiàwǔ sān diǎn, gāi kāihuì le.
It's three o'clock in the afternoon now; it's time for the meeting.
我们约好了晚上七点见面。
Wǒmen yuē hǎo le wǎnshang qī diǎn jiànmiàn.
We agreed to meet at seven in the evening.
每天早上六点他就起床跑步了。
Měitiān zǎoshang liù diǎn tā jiù qǐchuáng pǎobù le.
Every morning at six o'clock he gets up to go running.