그때가

that time

→ 그때
phrase Uncommon #12,377
that time 그때 means “that time” or “then”; 가 marks it as the subject. Its exact translation depends on the sentence.
KO: 그때가 정말 좋았어요.
EN: That time was really nice.

그때가 지금 이란 걸 모르겠어?

Don't you realize that now is the time?

— 데이 워치 (2006)

그놈이 총을 잡으면, 그때가 시작 이야.

When he gets his hands on the gun, that’s when it starts.

— 더 러닝 맨 (2025)

씨발, 그때가 좋았는데, 응?

Fuck, things were good back then, huh?

— I Saw the Devil (2010)

그때가 그리워

I miss those days.

— 화양연화 (2000)

그때가 몇 시 였죠?

What time was it then?

— 어 퓨 굿 맨 (1992)

그때가 여덟 살이나 됐을 때 죠

I must have been about eight years old then.

— 400번의 구타 (1959)

그때가 좋은 거 예요

That's when it's best.

— 어 퓨 굿 맨 (1992)