[number] + 点 + [number] + 分 [number] + 点半 [number] + 点 + 一刻 / 三刻 差 + [number] + 分 + [number] + 点
Clock time is built from diǎn点 for the hour and fēn分 for the minutes, largest unit first.
Minutes count forward through the hour, so "ten to seven" is 六点五十分. From ten minutes up, the 分 can drop: 三点二十.
To count down to the hour instead, put chā差 and the minutes in front of it.
Two o'clock takes 两, because 点 counts like a measure word. The minutes keep 二, and so does 十二点.
Like 今天 and 明天, a clock time sits after the subject and before the verb, never at the end.
上午, 下午 and 晚上 come before the hour: largest unit first again.