四分律刪補隨機羯磨 2.427

2.427

（乃至「十四日」言之。若大，言大也。其白月者，以純大故，但言「今朝白月一日」乃至「十五日」。）

(Saying it like this up to "the fourteenth day." If it is a long month, say it is long. For the bright fortnight, because it is purely long, one merely says, "This morning is the first day of the bright fortnight," up to "the fifteenth day.")