《农桑辑要·典训·经史法言》
服虔说： 一月之中，另加每天半夜纺织，合计十五天，所以共有四十五天。 
服虔曰： 一月之中，又得夜半为十五日，凡四十五日也。 
Fu Qie said: Five hours of spinning were added to each day in a month, which totaled to 15 days. Therefore, there were 45 days in total.