The United Nations General Assembly designated January 27—the anniversary of the liberation of Auschwitz-Birkenau—as International Holocaust Remembrance Day.
On this annual day of commemoration, the UN urges every member state to honor the six million Jewish victims of the Holocaust and millions of other victims of Nazism and to develop educational programs to help prevent future genocides.
https://www.ushmm.org/remember/intHistoernational-holocaust-remembrance-day