context: The establishment of the Czech Republic was officially announced on October 28, 1918 as a result of the union of five regions independent of the Austro-Hungarian Empire. These regions are: Bohemia, Moravia, and parts of Silesia (all in present-day Czech Republic), Slovakia, and the Carpathian Ruthenia (in present-day Ukraine). Its first chief was Thomas Masaryk, followed by Edward Peniche.
question: When was the Czech Republic announced?
answers.text: October 28, 1918