One small correction, though: Serbian Church, along with Russian and Jerusalem Church, goes by the old calendar (Julian), not new, and we simply call it Church calendar. The new, Gregorian calendar, was only recently adopted by the Greek, Romanian and other Sister Churches (in 20th century). This has caused some very painful schisms and problems within each of the Orthodox churches that went with the innovation, primarily within Greek Orthodox Church, now divided among the ‘old calendarists’ (Church calendar) and the new calendarists (Gregorian calendar).

Serbian, Russian and Jerusalem Church have not accepted the change and have not switched to the new calendar (which we sometimes refer to as “the papist calendar”, because it was just another ruse to split the Eastern Orthodoxy). More on the calendar controversy and numerous problems this has caused is available, in great detail, on Patrick Barnes’ exceptional web site dedicated to Orthodoxy.