a simple discussion about christmas with grandma , for instance , which leads to scotts measured observation that for centuries it had been celebrated january 5th until the british moved it , this only prompts a rambling rant , beginning with oh no , buddy , about changes in the calendar and so on and so forth that might or might not be true , as far as he knows , but in any case surely has nothing to do with the fact that no specific dates for this event are given anywhere in the bible .