In 2009, UNESCO, the cultural arm of the United Nations, listed the holiday on its Representative List of the Intangible Cultural Heritage of Humanity, noting that it “promotes values of peace and solidarity between generations and within families as well as reconciliation and neighborliness.” March 21 is officially recognized as International Nowruz Day, though the holiday itself is celebrated between March 19 and 22, depending on calendars and vernal equinox calculations.
