제 목 : I was sad until now가 맞나요?

저 영어 전공했는데 
모르겠어요 ㅎㅎ
I've been sad until now?
뭔가 우리말식으로는 완료로 써야 할것 같은데....

I was sad until now 하면 
I was sad till a second ago, but I am not any more.
이런 의미로 과거시제가 가능한가요?