Since yesterday our church got the once in 6 year opportunity to celebrate Epiphany, or as the 1662 Book of Common Prayer puts it, the Manifestation of Christ to the Gentiles, I was diverted by your reminder of the late Christmas in the East. At first I thought it might be just the E feast, but no, your references disclose that is merely Armenian practice. I now understand it is the whole Julian calendar that makes for late Christmas, 13 days so far, and I suppose Julians will will get later than Gregorians as time goes by.
In 2100 Christmas Day will be on 8 January, but I guess we won't have to worry about that. Interesting that with two Serbian alphabets to choose from, you went for the international phonetic alphabet.