At five o 'clock in the morning.

在清晨五点的时候。

youdao

A: Our flight is at five o 'clock.

我们搭的是五点钟的飞机。

youdao

To-morrow evening, at five o 'clock.

明天傍晚五点钟。

youdao

This man said at about five o'clock in the morning, he heard the dam collapse and all of sudden the water rushed towards the houses.

VOA: standard.2009.03.27

They were rehearsing for a concert, to be performed at five o'clock this afternoon.

NPR: Adventures Along the Caspian Pipeline

Indeed, at five o'clock on a Thursday afternoon, just as I was leaving, a party seemed to be developing organically.

WSJ: Inside the App Culture

"I started work at five o'clock and at about five fifty (17:50 GMT) a police office came in and asked us to clear the bar, " she said.

BBC: Dissident republicans blamed over north Belfast pipe bomb