The end of June deadline for a nuclear deal between Iran and world powers is **t sacred and extra time may be necessary, a top Iranian negotiator said on Tuesday. Iran and the five permanent members of the UN Security Council plus Germany have set June 30 as the date for a comprehensive accord regarding Tehran's disputed nuclear programme. "If we need a few extra days it's **t important because there are ** sacred dates," he said of the talks with the United States, Britain, China, France, Russia and Germany.