Nowruz is celebrated and observed by Iranian peoples and the related cultural continent and has spread in many other parts of the world, including parts of Central Asia, South Asia, Northwestern China, the Crimea and some groups in the Balkans.
Nowruz marks the first day of spring and the beginning of the year in Iranian calendar. It is celebrated on the day of the astronomical vernal equinox, which usually occurs on March 21 or the previous/following day depending on where it is observed.
The UN's General Assembly in 2010 recognized the International Day of Nowruz, describing it as a spring festival of Persian origin which has been celebrated for over 3,000 years. During the meeting of the Inter-governmental Committee for the Safeguarding of the Intangible Heritage of the United Nations, held between 28 September - 2 October 2009 in Abu Dhabi, Nowruz was officially registered on the UNESCO List of the Intangible Cultural Heritage of Humanity.