英语的8 30怎么说

In English, you can say "eight thirty" or "eight thirty AM/PM" to express the time 8:30.
For example:
"I have a meeting at eight thirty in the morning."
"The movie starts at eight thirty in the evening."
Note that it is also common to use the military time notation "0830" to express 8:30. In this notation, the first two digits represent the hour, and the last two digits represent the minutes.