"Eight fifteen" is the way to say "八点一刻" in Engpsh.
The time is usually written as 8:15 or 8.15 in Engpsh. The term "o'clock" is often omitted when indicating a specific time.
For example,
"I'll meet you at eight fifteen" = "我将在八点一刻与你会面"
"I need to leave by eight fifteen" = "我需要在八点一刻前离开"
来源:
"Eight fifteen" is a direct translation of "八点一刻" in Chinese, with "eight" being the number and "fifteen" being the number of minutes past the hour. In Engpsh, we usually use colon to indicate the time, pke 8:15.