Definition
An entire day is an undivided, continuous period of twenty-four hours, beginning and ending at midnight (12:00 a.m.). The concept emphasizes wholeness: an entire day cannot be satisfied by combining parts of two separate calendar days. It has a fixed, legally precise start point and a fixed, legally precise end point.
The phrase most commonly appears in statutes and contracts where the law requires that something occur, be prohibited, or remain in effect for a full and uninterrupted day — not merely some portion of a day spanning across a midnight boundary.
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Common Language
Modern common usage (Wiktionary): "Entire day" in ordinary English means the whole of a given day, often used loosely to mean a long time or the full duration of daylight hours — as in, "I spent the entire day working."
Historical common usage (Webster's 1913): Webster's does not treat "entire day" as a discrete entry, but "entire" is defined as whole, undivided, unbroken — consistent with its legal application.
The gap between common and legal usage is meaningful in one specific respect: in ordinary speech, "the entire day" may informally refer only to waking hours or daylight hours. In law, it means all twenty-four hours of the calendar day, commencing and concluding precisely at midnight. A statute requiring something for "the entire day" cannot be satisfied by conduct spanning only daytime hours, nor by conduct beginning before midnight on one day and ending after midnight on the next.
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Why It Matters in Research
The phrase "entire day" appears most frequently in older statutory and regulatory contexts — particularly election law, liquor licensing, and Sunday closing laws — where legislatures wanted to require complete prohibition or compliance for a full calendar day without gaps or technical workarounds. Black's illustrates this with election-day saloon-closing statutes, where the question was whether partial-day closure satisfied the statutory command.
Researchers working in historical sources should watch for three traps:
First, courts in the nineteenth and early twentieth centuries were more likely to encounter disputes about what "day" meant as a unit of time — whether it ran from sunrise to sunset, from midnight to midnight, or some other span. The definition settling on midnight-to-midnight was a judicial construction, not always obvious from the face of older statutes.
Second, the concept of an "entire day" as an undivided unit bears on deadline and limitations questions. If a statute requires a filing or action by a certain day, questions arise about whether that day is "entire" — i.e., whether the full twenty-four hours are available or whether some portion is cut off. Related terms like "clear day," "calendar day," and "judicial day" each carry distinct meanings that can differ from "entire day."
Third, researchers should not assume modern statutes use the phrase with the same technical precision. Contemporary drafting often substitutes "calendar day" or specifies clock times, making disputes about what constitutes an "entire day" less common but not obsolete.
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Historical Dictionary Support
Black's Law Dictionary defines "entire day" as "an undivided day, not parts of two days," requiring a legally fixed, precise beginning and end. The twenty-four-hour period runs from midnight to midnight. Black's cites an Alabama authority for this proposition and illustrates the term's practical application in the context of election-day statutes requiring closure of liquor saloons during "the entire day of any election."
No other shelf sources in the Law Mind corpus provide a separate entry for this term. Black's treatment is the authoritative historical source, and it is consistent in all editions that include the phrase. The definition has not evolved significantly — what has changed is the frequency with which the phrase appears in modern statutory drafting, where it has largely been displaced by more precise temporal language.
Black's entry is truncated in available sources but its doctrinal content is clear: the emphasis is on indivisibility. Courts applying the term rejected arguments that compliance with part of a day, or a continuous period spanning two calendar days, satisfied a requirement of an "entire day."
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Jurisdictional Note
The midnight-to-midnight definition of "entire day" reflects the general common law rule adopted across American jurisdictions, but specific statutory contexts may alter the analysis. Some state codes define "day" or "calendar day" expressly, which can control over the common law default. Researchers should check whether the governing statute or code contains its own definitional section before relying on the common law construction.
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