часов ночи

o'clock at night

→ час
phrase Rare #28,761
o'clock at night Used after a number to specify a time after midnight and before morning, as in три часа ночи, “3 a.m.” The form часов is used with numbers ending in 5–0 and with 11–14; час and часа are used with other numbers.
RU: Мы приехали домой в пять часов ночи.
EN: We got home at five o’clock at night.

Мы проговорили до двух часов ночи.

We talked until two in the morning.

Том занимался до двух часов ночи.

Tom studied until two o'clock in the morning.

Я записал, что родился в пятницу в двенадцать часов ночи.

I wrote down that I was born on Friday at midnight.

— История Дэвида Копперфилда (2019)