Christmastide, as it is often called, is in the winter of the Northern Hemisphere, at a time when there were already ancient festivals. Some of the traditions that are used for Christmas are older than Christmas, or come from other non-Christian traditions such as Yule. Modern traditions of Christmas often focus on the giving of gifts. The season for retail stores to sell gifts, food, greeting cards, Christmas trees, and decorations begins the day about a month before Christmas Day.