Uttar Pradesh Chief Minister Akhilesh Yadav on Tuesday said that the slogan of `acche din` wasn`t that of the Bharatiya Janata Party (BJP) but that of a marketing company.These are times of marketing. The slogan of `acche din` wasn`t the slogan of a party but of a marketing company. If it would have been the party`s slogan, then good days would have definitely come," said Yadav while addressing a rally here.