Definition
Dies dominicus (Latin: "the Lord's day") is the legal term for Sunday. In its operative legal sense, the term functions primarily through the maxim dies dominicus non est juridicus — Sunday is not a court day, or a day for judicial proceedings or legal purposes. Under traditional common law, Sunday was excluded from the reckoning of legal time: courts could not sit, writs could not be served, and legal acts performed on that day were generally void or voidable.
Why It Matters in Research
The practical significance of dies dominicus in legal research is almost entirely procedural and temporal. Researchers working with historical pleadings, limitation periods, or procedural records should be alert to the following:
Sunday exclusions in time computation. At common law, when a legal deadline fell on Sunday, the act was typically required on the next secular day. This rule appears throughout early English and American procedural sources and can affect how researchers interpret deadline calculations in historical documents.
Void acts versus voidable acts. Historical sources are not uniform on whether acts performed on Sunday were absolutely void or merely voidable. The distinction mattered for contracts, service of process, and arrests. Some early American statutes reinforced the common law rule; others modified it. Researchers examining 19th-century disputes about Sunday contracts or Sunday arrests will find this ambiguity running through the sources.
Blue laws and statutory Sunday restrictions. The common law maxim was supplemented in many American jurisdictions by Sunday statutes (so-called "blue laws") that independently prohibited specified activities. These statutes operated alongside, not merely as codifications of, the common law rule. Researchers should not assume that dies dominicus as a common law concept fully explains the legal treatment of Sunday acts in a given jurisdiction — statutory context is essential.
Connection to dies non juridicus. Dies dominicus is the most prominent instance of the broader category dies non juridicus (a non-juridical day). Researchers encountering either term in historical sources should cross-reference the other, as the principles governing dies non in general apply to Sunday specifically.
Diminishing modern relevance. The strict common law rule that Sunday acts are void has been substantially eroded or abolished in most American jurisdictions by statute. Modern procedural rules (including the Federal Rules of Civil Procedure) typically include Sunday in time-computation provisions while allowing for deadline extensions when the last day falls on a Sunday. Do not assume historical common law treatment governs a modern procedural question.
Historical Dictionary Support
The four source dictionaries are in full agreement on the core definition: dies dominicus means Sunday, the Lord's day. All four reproduce or reference the maxim dies dominicus non est juridicus. Black's and Burrill's are the most substantive, both citing Coke on Littleton (135a), Noy's Maxims, Wingate's Maxims, and Broom's Legal Maxims as authority for the juridicus rule. Burrill's additionally references the Justinianic Code (Cod. 3.12.11) and Finch's Law, giving the term a Roman law lineage alongside its English common law development.
Bouvier's entry is notably brief and transitions immediately into the adjacent entry for dies fasti (Roman law court days), which is useful context: dies dominicus sits at one pole of a Roman-derived taxonomy of days — fasti (open for legal business) versus nefasti or non juridici (closed). Rapalje & Lawrence offer no more than a translation.
What the historical dictionaries do not address is the American statutory dimension. None of the source entries engage with Sunday statutes, blue laws, or the question of whether Sunday acts are void versus voidable under different legal systems. Researchers should treat these entries as establishing the common law baseline, not as a complete account of how Sunday was treated in practice.
Jurisdictional Note
American jurisdictions varied considerably in their treatment of Sunday acts, particularly regarding contracts made or performed on Sunday. Some states held such contracts void ab initio; others treated them as merely voidable or unenforceable only if the party asserting the defense had also violated the Sunday law. Modern statutory reform has largely displaced the common law rule, but the extent of displacement differs by jurisdiction and subject matter.