Times to the minute (点 … 分)

When does the train leave?

• You are buying a train ticket and the clerk tells you the departure time.
• train火车huǒ chē八点bā diǎn二十五èr shí wǔto separate分开fēn kāi。 — "The train leaves at 8:25."

Number + point点diǎn + Number + part分fēn

• Xpoint点diǎnYpart分fēn = X:Y. 八点bā diǎntwenty二十èr shífive minutes五分wǔ fēn = 8:25. In speech part分fēn is often dropped after ten minutes: 八点bā diǎn二十五èr shí wǔ.
• For 1–9 minutes, add zero零líng (líng): 八点bā diǎnzero零língfive minutes五分wǔ fēn = 8:05.

now现在xiàn zàiis是shìthree o'clock三点sān diǎnzero零língfive minutes五分wǔ fēn。

half半bàn, quarter (hour)刻kè and used in 参差差chà

• half半bàn = half past: 七点qī diǎnhalf半bàn = 7:30. quarter (hour)刻kè = quarter: 九点jiǔ diǎna quarter一刻yí kè = 9:15, 九点jiǔ diǎn三刻sān kè = 9:45.
• used in 参差差chà = "to": used in 参差差chàfive minutes五分wǔ fēn十点shí diǎn = five to ten (9:55).

we我们wǒ menhalf past seven七点半qī diǎn bànmeet见面jiàn miàn吧ba。

The time comes before the verb

Morning, afternoon, evening

• Add the part of the day first: early morning早上zǎo shàng六点liù diǎn, afternoon下午xià wǔthree o'clock三点sān diǎn, evening晚上wǎn shàng十点shí diǎn.
• afternoon下午xià wǔtwo o'clock两点liǎng diǎna quarter一刻yí kè — "2:15 p.m." The larger unit always comes first.

afternoon下午xià wǔtwo o'clock两点liǎng diǎna quarter一刻yí kè。

Recap

Read the full reference: HSK 3 grammar — Numbers.