How the Bible tells time
The Bible keeps time on a different clock: days begin at evening, daylight hours count from sunrise and stretch with the seasons, the night is divided into watches, months begin with the new moon, and any part of a day counts as the whole day. Most of the “time contradictions” raised against the text are conversions done wrong: reading a sunrise clock with a midnight one.
The day begins at evening
And God called the light Day, and the darkness he called Night. And the evening and the morning were the first day. Genesis 1:5 KJV
Evening first, morning second, six times in the creation week. The Law makes it operational: “from even unto even, shall ye celebrate your sabbath” (Leviticus 23:32 ). The day runs sundown to sundown.
Consequences the gospels assume without explaining:
- The sabbath begins Friday at sundown. The burial is hurried “because of the Jews’ preparation day” (John 19:42 ): the clock runs out at sunset, not at midnight.
- Demoniacs and sick are brought to Jesus “at even, when the sun did set” (Mark 1:32 ): the sabbath ended at sundown, and the town could carry burdens again.
- “Three days and three nights” arithmetic runs on sundown boundaries and inclusive counting, covered in its own article.
The hours of the day
Daylight was divided into twelve hours, counted from sunrise. Jesus states the system: “Are there not twelve hours in the day?” (John 11:9 ). The hours are twelfths of daylight: longer in summer, shorter in winter. There are no minutes; the units in actual use are quarter-days marked by the third, sixth, and ninth hours (the hours of temple prayer, Acts 2:15 , 10:9 , 3:1 ).
| Biblical hour | Modern equivalent (equinox) | Marker |
|---|---|---|
| Sunrise | ~6 am | Day begins counting |
| Third hour | ~9 am | Morning prayer; Pentecost (Acts 2:15) |
| Sixth hour | ~noon | Peter on the housetop (Acts 10:9) |
| Ninth hour | ~3 pm | Hour of prayer (Acts 3:1); the evening sacrifice |
| Twelfth hour | ~6 pm / sunset | Day ends, evening begins the next date |
Mark’s third hour and John’s sixth
The one genuinely hard case. Mark 15:25 : “And it was the third hour, and they crucified him” (~9 am). John 19:14 : “it was the preparation of the passover, and about the sixth hour”, at the sentencing, before the crucifixion. On the sunrise clock John’s sixth hour is noon, which puts the sentence three hours after Mark’s execution.
Two resolutions carry the discussion.
Roman civil reckoning. Roman legal and civil documents counted the day from midnight (the modern convention descends from it). If John, writing late and outside Judea, uses that convention, his “about the sixth hour” is about 6 am: sentencing at dawn, crucifixion at 9, darkness at noon (Mark 15:33 , “when the sixth hour was come,” sunrise reckoning). Everything falls in order. The weakness: John 1:39 and 4:6 read naturally on the sunrise clock, so John would be mixing systems.
Approximation. Neither writer owns a watch; both speak in quarter-day blocks. Mark rounds the morning’s events to “the third hour”; John says “about” (ὡς ) the sixth, late morning, approaching noon. The two statements bracket the same late-morning window from opposite sides.
Both options are honest; a claimed contradiction requires assuming both writers used one precise shared clock, which is the one assumption the ancient evidence rules out.
The watches of the night
The Old Testament night has three watches: the “beginning of the watches” (Lamentations 2:19 ), the “middle watch” (Judges 7:19 , Gideon strikes at its start), and the “morning watch” (Exodus 14:24 , the Egyptians in the sea).
The gospels run on the Roman system of four. Mark 13:35 lists them as evening, midnight, cockcrowing, and morning:
| Watch | Name in Mark 13:35 | Modern |
|---|---|---|
| First | Even | 6–9 pm |
| Second | Midnight | 9 pm–12 |
| Third | Cockcrowing | 12–3 am |
| Fourth | Morning | 3–6 am |
Jesus walks on the sea “in the fourth watch of the night” (Matthew 14:25 ), between 3 and 6 am, after the disciples had rowed most of the night. Peter’s denials before “cockcrowing” sit in the third watch by name: the Lord’s word in Mark 14:30 uses that watch as the deadline.
Months and the new moon
The month begins with the new moon; one word covers both: chodesh (חֹדֶשׁ , “new moon, month”), from the root ch-d-sh, “new”, the same root behind the renewed covenant (brit chadashah). Lunar months run 29 or 30 days; twelve of them fall about 11 days short of the solar year, so a thirteenth month was intercalated to keep Passover in spring. Exodus 12:2 fixes Abib/Nisan as “the beginning of months,” and Abib means “green ears”: the calendar is pegged to the barley ripening for Firstfruits.
The feasts are the month’s fixed furniture: Passover on the 14th at even (Leviticus 23:5 ), Unleavened Bread the 15th, trumpets on the 1st of the seventh month, atonement the 10th, Sukkot the 15th. When the text dates an event by a feast, it is giving a calendar date.
The prophetic year of 360 days
Revelation equates three spans of the same period: “a time, and times, and half a time” (Revelation 12:14 ), “a thousand two hundred and threescore days” (12:6 ), and “forty and two months” (11:2 , 13:5 ). The equation 1,260 days = 42 months = 3.5 years only balances with 30-day months and a 360-day year. Daniel’s “time and times and the dividing of time” (Daniel 7:25 ) runs on the same arithmetic. Prophetic day-counts (Daniel 9’s weeks; the chronology anchors) must be converted through 360, not 365.25; a units error here throws every end-date calculation that ignores it.
Part of a day counts as a day
The inclusive-counting rule underlies spans everywhere in the text: circumcision “the eighth day” counts the birth day as day one; “after eight days” in John 20:26 lands on the following Sunday; “three days and three nights” spans Friday to Sunday. The rule, its rabbinic formulation, and the resurrection arithmetic have their own article.
References
- Babylonian Talmud, Pesachim 4a: part of the day is as the whole (miktsat hayom kekulo).
- Pliny the Elder, Natural History 2.79: survey of the different conventions for the day’s starting point (Roman civil day from midnight).
- Mishnah, Berakhot 1:1: the watches of the night in rabbinic reckoning.