held at the United Nations in New York, with the support of Kofi Annan, in April. 2001 – Date set at 21 September In 2001 the opening day of the General Assembly was scheduled for 11 September, and Secretary General Kofi Annan drafted a message recognising the observance of International Peace Day on 21 September. The September 11 attacks, often referred to as 9/11, were perpetrated on that same day when a series of four coordinated terrorist attacks by the militant Islamist terrorist group al-Qaeda against the United States of America occurred just blocks away from the UN on the morning of Tuesday, September 11, 2001. That year the day was changed from the third Tuesday to specifically the twenty-first day of September, to take effect in 2002. A new resolution was passed by the General Assembly, sponsored by the United Kingdom (giving credit to Peace One Day) and Costa Rica (the original sponsors of the day), to give the International Day of Peace a fixed calendar date, 21 September, and declare it also as a day of global ceasefire and non-violence. 2004 – Taiwanese commemorative stamp controversy A diplomatic stir occurred when Lions Clubs International sponsored a competition for six posters to be used for International Day of Peace commemorative stamps issued by the UN Postal Administration. A poster by 15-year-old Taiwanese school student Yang Chih-Yuan was announced as one of the winners, but the announcement was withdrawn. Taiwan media reports, Taiwan Lions Club and the government of Taiwan claimed the decision not to use the poster resulted from pressure from China; the rejection of the student's painting on political grounds did not reflect the ideals of the International Day of Peace. The UN issued a statement that, although in the shortlist of eight designs, "due to an internal misunderstanding and miscommunication, Mr. Yang's proof got publicized in error as one of the six stamps intended to be issued." The government of Taiwan (Republic of China) later issued a stamp containing the image. 2005 – UN Secretary General calls for 22-hour ceasefire In 2005, United Nations Secretary-General Kofi Annan called for the worldwide observance of a 22-hour ceasefire and day of nonviolence to mark the Day. Global survey of celebration The Culture of Peace Initiative published an annual report for the International Day of Peace in 2005 describing events in 46 countries: Africa 11; East Asia and Pacific 12;