(ANSA) - Milan, May 26 - Expo Commissioner and CEO Giuseppe Sala said Tuesday he was "proud" of the decision to extend the opening hours of the world's fair to midnight on Saturdays and Sundays as it showed it had visitor appeal. On all other days including public holidays the Universal Exposition would continue to close at 11 pm, he added. Expo runs until October 31 on the theme 'Feeding the planet, energy for life'.