'zuo tian xing qi liu'(昨天星期六) that is enough
'le' is used together with verb,for example 'zuo tian ta zou le'(昨天他走了)
2011년 9월 12일
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le is no use in here
2011년 9월 11일
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You can say "zuó tiān (shì) xīng qī liù " or "zuó tiān (shì) lǐ bài liù " ("shì" can be omitted)
saturday = xīng qī liù = lǐ bài liù
I hope it helps. ^^