COLOMBO (AFP) - Sri Lanka put off marking "Earth Hour" because it clashed with the cricket World Cup, an official said Sunday. Sri Lanka had joined the WWF drive to switch off lights for an hour on Saturday to display its green credentials, but the day-night match between England and the home team forced a rethink. Sri Lanka went onto to score a spectacular 10-wicket win to reach the semi-finals against New Zealand on Tuesday. A spokesman for the organisers said the country will now mark "Earth Hour" 24 hours later on Sunday when state and private business will keep their illuminations switched off. "We decided to hold the Earth Hour on Sunday because of Saturday's match," said minister Udaya Gammanpila. Tuesday's semi-final will also be a day-night match played under floodlights at the 35,000-seat R. Premadasa stadium.