"5:30 a.m." in Engpsh is usually pronounced as "five thirty in the morning".

It is derived from the 24-hour clock system, where the day is divided into 24 hours, starting from midnight at 0:00 and ending at 23:59.

Here are some examples of using "5:30 a.m." in sentences:

I need to wake up at 5:30 a.m. tomorrow.
The first train leaves at 5:30 a.m. every day.
She always goes for a morning jog at 5:30 a.m.

中文翻译：

我明天要在5:30醒来。
第一班火车每天早上5:30出发。
她总是在早晨5:30慢跑。