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Nektarios_Lady
Guest
There is not a single Orthodox Church who uses the Gregorian Calendar.Not all Eastern Orthodox use the Julian calendar; many celebrate Christmas on December 25, and use the Gregorian calendar, but not all, because the Gregorian calendar is identified as uniquely Catholic, so switching to it is a significant break with Orthodox tradition, and perceived by many as a concession to the Catholic Church, even though it is more of a concession to the modern world, which has universally adopted the Gregorian reckoning.
There are several Orthodox Churches, like mine, who use the modified Julian Calendar and as a results in the day for the celebration of the Nativity of Jesus Christ on the Julian Calendar to fall on the secular calendar of December 25th.
Because of the matching date of the Nativity, I can understand the confusion, but Orthodox have never used the Gregorian Calendar - which among Orthodox parishioners is commonly referred to as the “Catholic Calendar”.