The date for the United Nations Chinese Language Day was selected from Guyu ("Rain of Millet"), which is the 6th of 24 solar terms in the traditional East Asian calendars, to pay tribute to Cangjie. Cangjie is a very important figure in ancient China, claimed to be an official historian of the Yellow Emperor and the inventor of Chinese characters. Legend has it that he had four eyes and four pupils, and that when he invented the characters, the deities and ghosts cried and the sky rained millet. From then on, Chinese people celebrate the day Guyu in honour of Cangjie. In the Gregorian calendar, it usually begins around April 20.
Chinese was established as an official language of the United Nations in 1946. However, in early years, Chinese was not commonly used in the work of the United Nations. The situation was improved after restoration of the lawful rights of the People's Republic of China in the United Nations in 1971. In 1973, the General Assembly included Chinese as a working language, which was followed by the Security Council in 1974. More and more UN offices and staff members work with Chinese language (the excerpt is reprinted from UN website).
The Open University of China (OUC) is dedicated to telling China's stories and promoting Chinese voices in order to present a realistic and comprehensive picture of China and to enhance its cultural influence. Through its celebrations of the United Nations Chinese Language Day, OUC has showcased its efforts in this regard, highlighting the importance of cultural exchange and the promotion of Chinese language and culture on an international platform.