"Es ist schon neun Uhr."

Translation: It is already nine o'clock.

[Janice298143]

I wrote, "it is already 9:00," and was told I had used the wrong word.

[Edem777]

schon (already or yet) may be replaced by "noch" ? in that case when schon means yet.

[OldMate2]

Noch means 'still' and schon means 'already', they are very different.

[flex567]

It is already nine o'clock. = It is already nine of clock. ?

[TrioLinguist]

Maybe one could say that a few hundred years ago, but as far as I know, today we do not.

[Ungewitig_Wiht]

I was under the impression it was "on the clock" but maybe it is "of the clock"

[aryuill]

Why is it is nine o clock not accepted

[OldMate2]

You need to address the "schon" in the question, so you should have had 'already' in your answer.