I think that tomorrow is October the first,the National Day,

I think that tomorrow is October the first,the National Day,and we won't go to school tomorrow.
But my mother said that tomorrow is September the thirty-first.So she let me do all the homework today.
Who is right,my mother or
My mother said that the odd months have thirty-one days and the even months have thirty days except February,and February has twenty-eight days or twenty-nine days.