We’ll try to explain to you how to answer the question “Который час?” (What time is it?) in the Russian language.
In general we divide the day in 2 x 12 hours, from полночь (midnight) to полдень (midday) and from полдень (midday) to полночь (midnight).
If you want to be more precise, you’ll have to add утра (morning), дня (afternoon), вечера (evening), ночи (night):
To tell the exact time in Russian is really simple: use a cardinal number (один, два, три …) + час (hour). But watch below the declension of час.
Который час? (what time is it?)
With the cardinal numbers 2, 3, 4 час has to be declined in the genitive singular (часа) and cardinal numbers from five onwards are followed with the noun in genitive plural (часов).
We also can say “пять часов ровно” or “ровно пять часов” (five o’clock sharp).
Половина means half past, четверть is used for the quarter and без четверти for 45 minutes or quarter to.
Который час? (what time is it?)
Note, when we tell the time in Russian (apart from the exact time), we look at the hour to come and not the one that has started. For example, for the first 30 minutes, we say, “три минуты десятого” (three minutes of the tenth hour) and for the second half of an hour, we say “без пяти минут девять” (five minutes to nine), the same way we do in English.
We use the cardinal number (одна, два, три …) + минута (for 1 and 21), минуты (for 2, 3, 4, 22, 23, 24) or минут for the other numbers + the ordinal number for the hour (первого, второго, третьего …).
Который час? (what time is it?)
We use без (without) + genitive singular/plural of the number of minutes + минуты/минут + cardinal number for the hours.
Который час? (what time is it?)
Note that sometimes you can encounter the form: “Сейчас без пяти три” (now it’s five to three) without using the noun минута (minute).
More about time expressions here.