"Dni, których nie znamy" (from Polish: Days, that we don't know yet) is a Polish-language song written by Marek Grechuta and composed by Jan Kanty Pawluśkiewicz.
The song was published by Polskie Nagrania Muza in 1971 on the album Korowód made by the Grechuta together with an instrumental band Anawa.
It was covered by many artists including: Michał Bajor, Kr'shna Brothers, Meza, Anna Treter, Plateau, Kamil Bednarek, duets of Grzegorz Turnau and Dorota Miśkiewicz and Maryla Rodowicz and Piotr Kupicha.
[2][3][4] It is commonly regarded among the fans of Korona Kielce football club as its unofficial anthem.
[6] It was also used in the 2015 short film Twardowsky which was part of film series Polish Legends.