When was the First Sunday law enacted?

Answer 1

The first Sunday law was enacted by Constantine in 321 AD.

Some time in 321 AD Constantine issues an edict forbidding work on "the venerable day of the sun" (Sunday), the day that had come to be substituted for the seventh-day Sabbath. Christians in general had hitherto held Saturday as sacred, though in Rome and in Alexandria, Egypt, Christians had ceased doing so.

"On the venerable Day of the Sun let the magistrates and people residing in cities rest, and let all workshops be closed. In the country, however, persons engaged in agriculture may freely and lawfully continue their pursuits; because it often happens that another day is not so suitable for grain-sowing or for vine-planting; lest by neglecting the proper moment for such operations the bounty of heaven should be lost." (Crispus and Constantine 321 AD.)

Source: (Codex Justinianus, lib. 3, tit. 12, 3; trans. in Philip Schaff, History of the Christian Church, Vol. 3 (5th ed.; New York: Scribner, 1902), p. 380, note 1)

Answer 2

The First Sunday law, sometimes known as the Blue Laws, were first enacted in the United States in the early 17th century. However, the specific dates of enactment varied depending on the state and locality. These laws typically prohibited certain activities, such as most forms of work and commerce, on Sundays.