Is the 360-day "prophetic year" actually in the Bible?

The 360-day "prophetic year" is built on a single piece of arithmetic in Revelation. Three formulas interlock:

• 42 months (Rev 11:2; 13:5)
• 1,260 days (Rev 11:3; 12:6)
• "a time, times, and half a time" (Rev 12:14)

If a month is 30 days, then 42 × 30 = 1,260, and "time, times, and half a time" (3.5) × 360 = 1,260. The numbers fit. Inside Revelation's symbol, this is real — and we should report it honestly. The question is whether the text ever calls that 360-figure a "year."

The lexical fact: the year-words are absent.

Across all eleven apocalyptic time-formulas in Daniel and Revelation — in Aramaic, Hebrew, and Greek — the canonical year-words shanah (שָׁנָה, H8141), etos (ἔτος, G2094), and eniautos (ἐνιαυτός, G1763) appear zero times. The framing words are instead iddan (H5732), moed (H4150), kairos (G2540), mēn (G3376), yom (H3117), and hēmera (G2250).

The author of Daniel knows the year-word and chooses not to use it here.

This is the inescapable fact. The book of Daniel uses shanah (H8141) 14 times in 12 verses and Aramaic shenah (H8140) twice — sixteen total occurrences in regnal datings and chronological notices (e.g., Dan 1:1; 1:5; 9:2). The author has the year-word. He uses it freely elsewhere. He does not use it in 7:25, 12:7, 12:11, or 12:12.

That is a deliberate lexical choice — repeated four times.

The LXX translator confirms it.

When the Septuagint translator rendered Daniel 7:25 into Greek, he had two real options: etos (G2094, "year") and kairos (G2540, "appointed time"). He chose kairos. He did the same at LXX Daniel 12:7. Etos never appears. The translator working closest to the Aramaic text — and to the legal/chronological vocabulary of the LXX as a whole — read iddan as belonging to the appointment-cluster, not the year-cluster.

John then quotes the LXX verbatim.

Revelation 12:14 reads καιρὸν καὶ καιροὺς καὶ ἥμισυ καιροῦ — word-for-word identical to LXX Daniel 12:7's εἰς καιρὸν καὶ καιροὺς καὶ ἥμισυ καιροῦ (minus the prepositional εἰς). John is quoting the Greek Daniel he knew. He preserves kairos. He does not substitute etos.

Three independent acts of authorship — a Hebrew/Aramaic prophet, a Greek translator working centuries later, and a Greek apocalyptist working centuries after that — converge on the same lexical refusal. None of them call this period a "year."

The semantic fields are different neighborhoods.

Embedding-similarity data confirms what the surface text shows. Kairos's top ten cosine-similar words contain zero year-words; its neighbors are chronos (G5550), proskairos (G4340), eukairia (G2120), eukairos (G2121), eukairōs (G2122), zeman (H2165/H2166), hōraios (G5611), hōra (G5610), and cheimōn (G5494) — every neighbor is in the appointment-or-season cluster. Moed's top ten neighbors (H4151 moad, H3259 yaad, H2165 zeman, H4152 muadah, H4662 miphqad, H2166 zeman Aram., H2706 choq, H2163 zaman, H4744 miqra) likewise contain zero year-words. Iddan sits closer to the boundary, but BDB's primary sense is "time of duration / appointed time"; "year" is a contextual gloss in some Daniel passages, not the lexeme's center.

What the arithmetic does and does not authorize.

The 30-day-month / 360-day-period equation works inside Revelation's symbol. That is real. It does not work as a uniform calendrical rule across all apocalyptic — Daniel 12:11–12 immediately breaks the clean 360 system on the canon's own terms (1,290 = 1,260 + 30; 1,335 = 1,260 + 75). Neither figure rounds to a clean "year" multiple. The text gives the day-counts and stops.

To translate kairos in Revelation 12:14 as "year, years, and half a year" — as some modern English Bibles do — is to retrofit a calendrical reading onto a lexical decision the canonical author already declined to make. The Greek text holds kairos and etos as different words. The Septuagint translator who chose kairos in LXX Daniel 7:25 had etos available and did not use it. John, quoting that LXX, preserved the choice.

The honest summary.

The 360-day "prophetic year" is a stylized number that holds together inside Revelation's apocalyptic equation. It is not something the canonical text ever calls a shanah or an etos or an eniautos. The 1,260/42/3.5 equation is genuine arithmetic on a stylized 30-day month. The "year" is a calculated inference — never a name the text gives.

For the lexical data on the year-cluster, the appointment-cluster, and the embedding neighborhoods, see What Is a Year in the Bible?. For the moed-language as the verbal bridge between Daniel and Leviticus 23, see Do Daniel's prophetic numbers connect to the biblical feasts?.