 <translate> To answer the question, consider the following: In most Western ecclesiastical traditions, "Christmas Day" is considered the "First Day of Christmas" and the Twelve Days are 25 December -- 5 January, inclusive. Therefore, the final answer is Christmas Day. <yor> Láti dáhùn ìbéèrè yìí, gbé èyí tó tẹ̀ lé e yìí yẹ̀ wò: Nínú ọ̀pọ̀ jù lọ àwọn àṣà Ìjọ Ìwọ̀ Oòrùn ayé, "Ọjọ́ Kérésìmesì" ni wọ́n kà sí "Ọjọ́ Àkọ́kọ́ ti Kérésìmesì" àti pé àwọn Ọjọ́ Mejìlá ni 25 December - 5 January, títí kan December. Nítorí náà, ọjọ́ Kérésìmesì ni ìdáhùn náà jẹ́. 