Calendar Days

What does Calendar Days mean in American Law?

The definition of Calendar Days in the law of the United States, as defined by the lexicographer Arthur Leff in his legal dictionary is:

Sometimes held to mean consecutive days as shown on a calendar, i.e., as distinguished from “working days” or “business days.” But the term has also held to be the same as working days, i.e., the term itself is a not very useful ground upon which to make any juridically determinative distinctions.