To say, "What time is it?" in Japanese say
Nanji desu ka?
If it is eight o'clock you can then answer with the word now or ima 今
Ima hachiji desu (今 八時 です) - It is now eight o'clock.
The hour counter in Japanese is ji or 時
ichiji - one o'clock
niji - two o'clock
sanji - three o'clock
yoji - four o'clock
goji - five o'clock
rokuji - six o'clock
shichiji - seven o'clock
hachiji - eight o'clock
kuji - nine o'clock
juuji - ten o'clock
juuichiji - eleven o'clock
juuniji - twelve o'clock
nanji? - what hour?
何時 - what hour?
一 時 - one o'clock
二 時 - two o'clock
三 時 - three o'clock
四 時 - four o'clock
五 時 - five o'clock
六 時 - six o'clock
七 時 - seven o'clock
八 時 - eight o'clock
九 時 - nine o'clock
十 時 - ten o'clock
十一 時 - eleven o'clock
十二 時 - twelve o'clock
Towards Better Japanese Ganbatte ne! Do Your Best! Makurasuki