He'll be here around four o'clock.

Source: Tatoeba

I asked Mother to wake me up at four.

Source: Tatoeba

I've got my hands full before 4 pm.

Source: Tatoeba

The next train arriving at platform 2 will depart for Shibuya at 4:35pm.

Source: Tatoeba

I am leaving at four.

Source: Tatoeba

He promised me to come at four.

He promised me that he would come at four.

Source: Tatoeba

I usually go home at four.

Source: Tatoeba

I'll wait till four o'clock.

I'll wait until four o'clock.

Source: Tatoeba

At four o'clock in the afternoon.

Source: Tatoeba