"Wtorek to nie mój dzień."
Translation:Tuesday is not my day.
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You shouldn't associate every negation with Genitive. Only negated Accusative turns into Genitive, other cases stay unchanged.
The positive sentence (Wtorek to mój dzień) takes Nominative, negating it doesn't change anything, it still takes Nominative.
More info here: https://forum.duolingo.com/comment/28545847