Telling the hour (Number + 点)

An early start

• Your new school timetable starts much earlier than you are used to.
• we / us我们wǒ menearly morning早上zǎo shàng七点qī diǎnto go to class上课shàng kè。 — "We start class at seven in the morning."

Number + point点diǎn (o'clock)

• Number + point点diǎn = o'clock: a bit一点yì diǎn, 三点sān diǎn, 十二点shí èr diǎn. Ask with what time几点jǐ diǎn: now现在xiàn zàiwhat time几点jǐ diǎn？ — "What time is it?"
• 2 o'clock is 两点liǎng diǎn, never 二点èr diǎn.

now现在xiàn zàiwhat time几点jǐ diǎn？

Saying when something happens

• you你nǐwhat time几点jǐ diǎnto finish work下班xià bān？ — "What time do you finish work?" I我wǒ六点liù diǎnto finish work下班xià bān。 — "I finish at six."
• Part of the day goes first: in the evening晚上wǎn shangnine o'clock九点jiǔ diǎn, noon中午zhōng wǔ十二点shí èr diǎn.

I我wǒin the evening晚上wǎn shangnine o'clock九点jiǔ diǎngo to bed睡觉shuì jiào。

Order matters

point点diǎn versus hours小时xiǎo shí

• point点diǎn is a point on the clock: 三点sān diǎn = 3 o'clock.
• hours小时xiǎo shí is a length of time: three三个sān gèhours小时xiǎo shí = three hours. I我wǒ三点sān diǎnto start开始kāi shǐ，study学xué(completed / change)了lethree三个sān gèhours小时xiǎo shí。

I我wǒstudy学xué了lethree三个sān gèhours小时xiǎo shí。

Recap

Read the full reference: HSK 3 grammar — Numbers.