Well, not necessarily. In some countries/cultures the "holy eve" (24th of December) has no significant meaning and only the 25th and following are celebrated and regarded as christmas. Therefore (internationally speaking) christmas doesn't have a specific date but a date intervall.
And let's be happy at least that they said christmas, not holidays. This is not meant as any kind of holliday bashing (be it hanukkah, kwanza, festivus, winterveil, whatever floats your boat have a merry one), just as a remark that then the intervall would have been quite a bit bigger (IIRC kwanza culminates on the 1st of January) ...