Revised Julian calendar
The feast is nominally celebrated on September 14. Thus Orthodox churches following the Revised Julian calendar celebrate it on the civil date of September 14: Constantinople, Alexandria, Antioch, Bulgaria, Greece, Cyprus, Romania, Poland, Czechia and Slovakia, Albania, the Estonia, and most of the Orthodox Church in America. Those following the Julian calendar celebrate it on civil September 27: Jerusalem, Russia, Serbia, North Macedonia, Georgia, Ukraine, Ukrainian Orthodox Church (Moscow Patriarchate), and Mount Athos.