The burning of the chametz is done between sunrise and the fourth hour of the day (determined by computing the total number of minutes in the day, dividing by “12” and multiplying by “4”). The Declaration of Nullification (daytime version) must be recited not later than the fifth hour of the day. No chametz may be eaten after the fourth hour; no chametz may be used, sold, or handled after the sixth hour. These time restrictions reflect elements of the sacrificial system that existed during the period of the Second Temple. The chametz, therefore, must be burned and Declaration recited, on Friday, April 19, by 11:46 AM. Many people recite the Declaration as the chametz is burning.