Is the Gregorian Calendar Pagan?
Thursday, 3pm — dentist. On a sticky note that is a thunder god, an hour and a dental hygienist, and only one of them expects anything of you.
Wednesday belongs to Woden. January belongs to Janus, the two-faced god of doorways. So is the Gregorian calendar pagan? The etymology is not in dispute — grant every syllable — but the conclusion people hang on it does not follow, and Scripture is the reason. The Bible numbers its weekdays, then borrows its month names from Babylon without a word of apology. And the New Testament does contain a test case for using something with an idol's fingerprints on it. It has nothing to do with calendars. It is about meat.
Is the Gregorian calendar pagan, or just Roman?
Start with a precision that saves a lot of argument. What Gregory XIII issued in 1582 was a leap-year rule, a one-off skip of ten dates, and new lunar tables to pull Easter back onto the spring moon. He renamed nothing. Every name anyone objects to was already ancient — the month names Roman, the English weekday names largely Germanic. The charge is not really against Gregory.
Now the inventory.
January is Janus, god of beginnings and thresholds — fitting, since the Roman consuls began taking office on its first day in the second century BC. March is Mars. Secure. February comes from februa, purification rites held that month. After that the ground softens. April may come from the Etruscan goddess Apru, or from aperire, "to open." May and June may honour Maia and Juno, or descend from words for "senior" and "junior." Classicists have not settled it.
July and August are men, not gods. Quintilis was renamed for Julius Caesar in 44 BC, Sextilis for Augustus in 8 BC, with Augustus alive to watch it happen. Rome gave both a divine cult in the end. September through December are seventh, eighth, ninth and tenth, wrong by two because the Roman year once began in March. The last third of your year is an old filing error.
The weekdays came from elsewhere. The seven-day planetary week spread through the Roman Empire in the first centuries of the era. Sun, Moon, Mars, Mercury, Jupiter, Venus, Saturn. Germanic speakers swapped in their nearest equivalents — Tiw for Mars, Woden for Mercury, Thunor for Jupiter, Frigg for Venus. Saturday alone kept its Roman god, a fossil sitting in English.
So yes. The gods are in there.
Naming a thing is not bowing to it
Scripture numbers its weekdays. "The first day of the week" — no name, no god, just a count.
Its months are another story. The names used after the exile — Nisan, Chislev, Shebat, Adar — came home from Babylon with the returning exiles, and Ezra, Nehemiah and Zechariah date inspired sentences by them without explanation.
Luke does the same in a single clause. Paul leaves Malta on an Alexandrian ship "whose sign was Castor and Pollux" — Acts 28:11. The Dioscuri: twin gods sailors prayed to in storms, carved on the prow of the ship carrying an apostle to Rome, and Luke records it like a licence plate. In Athens the same apostle borrows a line from a Greek poem about Zeus and hands it to "the God that made the world" (Acts 17:24, 28).
None of that is laxity. The same Scripture is ferocious about actual idolatry. It draws a distinction, and the distinction is not about where a word came from.
One concession is owed. Words do carry things, and someone who cannot write "Thursday" without a flicker is not being ridiculous — he is reporting his own conscience, and the New Testament takes that seriously. Which is where the meat comes in.
Meat from the market, and the question Paul refuses to ask
Corinth had a supply problem for scrupulous believers: meat sold in the city could have passed through a temple on its way to the stall. Paul spends three chapters on it and says three things that look like they cancel out.
First, the idol is nothing: "we know that an idol is nothing in the world, and that there is none other God but one" — 1 Corinthians 8:4.
Second, the temple meal is bolted shut: "Ye cannot drink the cup of the Lord, and the cup of devils" — 1 Corinthians 10:21.
Third — the sentence that decides the matter — the market is open without a conscience-driven inquiry into the meat's provenance: "Whatsoever is sold in the shambles, that eat, asking no question for conscience sake" — 1 Corinthians 10:25. Possibly the very same animal. Paul tells buyers not to turn the purchase into a conscience-driven investigation.
Put the three together and the line falls somewhere else. Not on the object's history. On participation — qualified by concern for somebody else's conscience: if a fellow guest points at the dish and says it was sacrificed, you leave it, "for his sake that shewed it, and for conscience sake" (10:28). The meat did not change. He did.
History does not defile. Participation does.
Which puts Thursday, 3pm — dentist firmly in the market. Nobody has invoked anything — a syllable has done its ordinary work of getting two people into the same room. Keeping a rite of Thor would be the temple couch. Those are not two points on one spectrum, and treating them as one is where this conversation loses its footing.
The only passage where the example is days
"One person esteems one day as better than another, while another esteems all days alike. Each one should be fully convinced in his own mind." — Romans 14:5 (ESV)
Mark one word, since the verse gets quoted as though it settled things. Behind "esteems all days alike" stands krinei pasan hēmeran — judges every day. No Greek word for "alike" is there. A translator supplied it to finish the English comparison — reasonable, and not a foundation.
Readers debate exactly which days Paul has in view; Jewish observances are one common interpretation. The passage does not discuss Latin or Germanic weekday names. So this is an analogy carried across, not a ruling on our question. It still does real work, because the mechanism transfers.
Watch who gets protected. Paul spends the chapter defending the man who abstains, telling the free believer not to look down on him and not to wreck him over a plate. The harder command lands on the larger liberty — though the abstainer is told, just as firmly, not to sentence the man who eats. One caution on carrying it across: Paul explicitly calls the vegetable-eater weak; he does not repeat that label in the sentence about days.
Two rails, both fitted. Whether the annual feasts sit under the same freedom is a separate argument, worked through in Colossians 2:16.
The believers who renamed them anyway
The argument goes wrong in the other direction too, whenever someone assumes that scrupling about weekday names is a fringe habit. It is not.
Martin of Braga, a sixth-century bishop in what is now northern Portugal, objected in writing to naming days after planets and gods. Portuguese still counts — segunda-feira is the second day, sexta-feira the sixth — a habit Galician-Portuguese once shared and Mirandese keeps, with only the weekend holding its old names.
Iceland did the same: Jón Ögmundsson, who died in 1121, turned Óðinsdagr into miðvikudagr, mid-week day, and Icelanders still say it. The early Quakers used numbered date vocabulary — First Day, First Month — against Norse gods, Roman gods and emperors alike, and "First-Day school" is still Quaker English.
So if numbering the days would quiet something in you, number them. That choice need not become a fence around fellowship. You can number your dates without judging neighbours who say Sunday.
If the switch you are weighing is larger than vocabulary, be clear about what it buys. Not clean names: the Hebrew months came home from Babylon too, and one carries the name of a Mesopotamian god Ezekiel watched women weeping over. What a 364-day calendar offers is a different shape — 52 whole weeks, anchored at the March equinox — with its own caveat: preserved in Enoch's Astronomical Book, in Jubilees and among the Dead Sea Scrolls, how widely it was ever kept is genuinely unsettled, and Day 4 does not claim to settle it. Still a better reason to look than the spelling of Thursday.
Which is the shape of Day 4 itself. Its Calendar screen stacks two dates on one row, feasts marked — the sacred date, and under it the everyday one still reading Tuesday, because your dentist does. Neither is printed as a correction of the other, for reasons older than the app. Today's sacred date, the next Sabbath and the day's devotional cost nothing and ask for no account.
Common questions
Are the month and weekday names really pagan in origin?
Partly, and less uniformly than the lists suggest. January and March honour Janus and Mars, February comes from purification rites, and April, May and June have contested etymologies. July and August are two Roman politicians. September through December are the numbers seven to ten. The English weekdays substitute Germanic gods into the Roman planetary week.
Is it a sin to use a calendar with those names?
No New Testament text says so, and the closest analogy points the other way. Paul tells Corinth to buy meat from a market where sacrificial meat might be sold, without asking questions for conscience's sake, while forbidding the temple feast itself. The line is participation, not provenance, and Scripture's own writers date events by Babylonian month names without comment. A conscience that still objects deserves respect.
Is celebrating January 1 a sin?
Scripture nowhere legislates it. The first of January is a Roman administrative date — the day the consuls took office — and Janus in the month's name does not by itself turn a modern gathering into his worship. Same test as everywhere else here: is something actually being honoured? A meal, fireworks and a resolution need not be acts of pagan worship.
Should Christians switch to a biblical calendar?
Some do, and it is a reasonable choice, but check what you expect from it. Switching will not deliver names free of foreign gods: the Hebrew month names travelled back from Babylon, and one is a Mesopotamian deity. A biblical calendar offers a different shape to the year, not a cleaner vocabulary, and its own history is argued over rather than settled.
How do I think about this without judging other believers?
Paul hands two verbs to two different people, and both are commands. Exoutheneō, to treat as nothing, is forbidden to the believer with the broader liberty. Krinō, to pass sentence, is forbidden to the one with the narrower. The extra weight goes on the freer man, who must give ground wherever his freedom would injure the person watching. Nobody is invited to read another believer's calendar as a report on his heart.
Say it either way
Run the experiment before the argument. Say "fifth day" for a week and notice what happens — whether something in you settles, or whether you start keeping score on other people. Both results tell you something true. Neither is a verdict on your neighbour.
The etymology will not move. Janus stays in January, and December 25 keeps its own long argument.
Underneath the vocabulary the sacred year has been counting the whole time. Day 4 keeps that count in view — today's place in it, no account asked — in whichever words you have settled on.
