Thanks for the information. I didn't know that, so I'm glad i do now and won't use that again in Korean

I know what you mean when you say "Today was good". But, it sounds little awkward to me. I guess it's because Koreans don't use the expression well. I guess the expression, today is/was good/bad, is pretty English or American one. I'm not saying that Koreans never use it and the correction, 오늘은 좋았어요, is grammatically wrong. If you ask me, i might say "오늘 저는 등이 아파서 일을 가지 않아 기분이 좋았어요" It's really hard to explain, cuz I'm not professionl on korean, that Koreans prefer to use a person/people or animal or something like that as the subject. That's is why i say it sounds litte awkard even if to use something like today as the subject is grammatically right. P.S. my enlgish skill is good to explain it. So if you can read and understand articles in korean, I recommend you this "http://www.studyforce.co.kr/board/?action=view&menu_id=19&no=23049"