五時に

at five o'clock

→ 5時
phrase Rare #29,751
at five o'clock に marks a specific time when an action occurs. 五時 can mean 5:00, with the context indicating morning or afternoon/evening.
JA: 五時に仕事が終わります。
EN: Work ends at five o'clock.

会合は午後五時に始まった

The meeting started at five in the afternoon.

あなたから連絡がない限り五時に会う予定います

Unless I hear from you, I'll plan to meet at five.

彼女は五時に戻ってきます

She will be back at five.

私たちは五時に駅に着いた

We arrived at the station at five o’clock.

五時に車であなたの家に迎えに行きます

I'll drive to your house to pick you up at five.

彼らは五時にお茶にする

They have tea at five.