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The fictional Christian Calendar, also known as Biblical Calendar, originally is an adapted Julian calendar – not shown here – with altered labels for days, weeks and months. It was soon changed into a more regular schedule and later into a 13-month calendar with 4 weeks each.

Christian Days of the Week[]

Days of the week
1 2 3 4 5 6 7
Origin Day of Light and Dark (and Sun) Day of Sky and Heaven (and Moon) Day of Land and Water (and Earth) Day of Air and Wind (and Birds and Fish) Day of Animals and Spirits or Angels Day of Mankind (and Life) Day of Rest (and God), Sabbath
Modern Liday Skiday Waday Irday Nimday Manday Holday
Elsewhere Sunday Monday Tuesday Wednesday Thursday Friday Saturday

Traditional Christian Calendar[]

Traditional Year with 30-day months
Quarters Matthævs Marcvs Lvkas Ioannes
Months Petrvs Andreas Iacobvs maior Ioannes Philippvs Bartholomæus Thomas Levi Iacobvs minor Thaddævs Simon Ivdas
1 2 3 4 5 6 7 8 9 10 11 12
Weeks5 1–6 7–12 13–18 19–24 25–30 31–36 37–42 43–48 49–54 55–60 61–66 67–72
Elsewhere March April May June July August September October November December January February

The Traditional Christian Calendar has its year divided into four quarters of equal length, named for the gospels, and each contains three months, named for the first apostles. Phases of the sun and moon are not explicitly considered by the calendar, but it is hardly less lunisolar than the Julian calendar.

Two different kinds of weeks are employed:

  • the longer one, like ours, has seven days and originates in the story of genesis,
  • the shorter one has just five days and there are 72 thereof in a year, commemorating Jesus’s disciples.

The year begins with the feast in memory of Jesus’s life and death: Birth – Preaching – Crucifixion – Resurrection – Ascension. This span of five days, sometimes called a Sabbath, does not formally belong to any week, month or quarter. Every fourth year it is preceded by another day to celebrate the (holy) family and the community. Other festivities are held on the second-to-last day of the week, spread across the year.

approximate date: week5 14, dow 4, quarter 1 = Matthævs, month 3 = Iacobvs maior, dom 9

In later times, four days of the holy quasi-week were distributed across the year as holidays. They would fall between the 15th and 16th day of every second month in a quarter, the family day was moved to the middle of the year. The Birth day (alias christmas) remained at the beginning. They still did not belong to any week or month.

Modern Christian Calendar[]

Modern Year with 4-week months, contemporary names
Quarters Matt Mark Luke John Josh
Months Pete Drew Jim Han Phil Bart Tom Levi Jake Thad Sim Jude
1 2 3 4 5 6 7 8 9 10 11 12 13
Weeks7 1–4 5–8 9–12 13–16 17–20 21–24 25–28 29–32 33–36 37–40 41–44 45–48 49–52

The Modern Christian Calendar is intended for thought experiments and fiction. In this calendar design, a thirteenth month has been added (to the Traditional Christian Calendar) outside the quarters, named for Jesus themself (Josh). All months have been shortened to 28 days, i.e. four weeks exactly.

It keeps the festivities in honor of Jesus’s birth outside the week and month cycle, but this “Christmas” now is – strangely – at the end of each year and the Family Day now follows it as a leap day not belonging to any year. Instead of celebrating the other holidays, Manday became a regular holiday every week, hence the Sabbath now spans two consecutive days at the end of each week (“weekend”).

Not respecting some custom rules, today is quarter: 1 = Matt; month: 3 = Jim; week: 11 of year, 3 of month ; day: 19 of month, 6 of the week = Manday

Also, the leap rule has been changed such that every eighth leap year is postponed by one year, i.e. there are eight leap days per 33-year cycle (mean 365.(24) days per year). This rule was amended few decades later, now after eight 33-year cycles there is an exceptional 29-year cycle, i.e. already the seventh leap year is postponed by one year, thus resulting in a larger, 293-year cycle (365.24232… days per year).

Parallel Biblical Calendar[]

Genesis parallel calendar with 7-week month, 7-month (343-day) year
Week of Month 1 2 3 4 5 6 7
Day of Month 1–7 8–14 15–21 22–28 29–35 36–42 43–49
Month of Year 1 2 3 4 5 6 7
Week of Year 1–7 8–14 15–21 22–28 29–35 36–42 43–49
Day of Year 1–49 50–98 99–147 148–196 197–245 246–294 295–343
Year of Cycle 1 2 3 4 5 6 7 (8)
Month of Cycle 1–7 8–14 15–21 22–28 29–35 36–42 43–49 50–56
Week of Cycle 1–49 50–98 99–147 148–196 197–245 246–294 295–343 344–392

In the Biblical Calendar, the seventh day, week and month are holidays, i.e. 121 of 343 days per year are not work days.

After ten Cycles (alias Commandments) of seven 343-day years, there is one long Cycle containing eight years. These eleven Cycles make an Age, of 78 years. Four Ages, i.e. 312 years, make an Era, of 2148 months or 15288 weeks. This is equal to 294 years of 52 weeks without any leaping or to 293 years with either 52 leap weeks or 71 leap days.

Although it would be possible to align the year better with solar calendars by extending 3 of the 7 months to 8 weeks and 4 of them in leap years (i.e. 52+1 weeks per year) as done in Cal7, this would be against the spirit of this calendar which mandates each (sub-year) cycle to contain seven items exactly and each last one being sacred.

Perpetual Christian Calendar[]

The alternative Perpetual Christian Calendar does not change any names and does not alter the months of the Julian calendar, i.e. an alignment of 31:28+:31:30:31:30:31:31:30:31:30:31 of its 365 days, 366 in leap years. It only changes the week cycle by introducing 15 or 16 irregularly spread eight-day weeks (called octaves) containing a Holiday after Saturday, which results in a perpetual calendar that has 50 weeks per year and every month date on the same day of the week every year, but the nth day of all months may occur on different weekdays, e.g. the first day falls on Sunday (Jan, Mar), Monday (Feb), Tuesday (Apr, May, Sep), Thursday (Jun, Jul, Oct) or Holiday (Aug, Nov, Dec).

Perpetual Christian Calendar
Month Week Sun Mon Tue Wed Thu Fri Sat Hol
January 01 01 02 03 04 05 06 07 08 Epiphany
02 09 10 11 12 13 14 15
03 16 17 18 19 20 21 22
04 23 24 25 26 27 28 29 30 Candlemas
February 05 31 01 02 03 04 05 06
06 07 08 09 10 11 12 13 14 Valentine
07 15 16 17 18 19 20 21
08 22 23 24 25 26 27 28 29 Leap
March 09 01 02 03 04 05 06 07 08 Shrove / Lent
10 09 10 11 12 13 14 15
11 16 17 18 19 20 21 22
12 23 24 25 26 27 28 29
April 13 30 31 01 02 03 04 05 06 Pascha
14 07 08 09 10 11 12 13 14 Easter
15 15 16 17 18 19 20 21
16 22 23 24 25 26 27 28
May 17 29 30 01 02 03 04 05
18 06 07 08 09 10 11 12
19 13 14 15 16 17 18 19
20 20 21 22 23 24 25 26 27 Ascension
June 21 28 29 30 31 01 02 03 04 Pentecost
22 05 06 07 08 09 10 11 12 Corpus Christi
23 13 14 15 16 17 18 19
24 20 21 22 23 24 25 26
July 25 27 28 29 30 01 02 03
26 04 05 06 07 08 09 10
27 11 12 13 14 15 16 17
28 18 19 20 21 22 23 24
29 25 26 27 28 29 30 31 01 Assumption / Metamorphosis / Transfiguration
August 30 02 03 04 05 06 07 08
31 09 10 11 12 13 14 15
32 16 17 18 19 20 21 22
33 23 24 25 26 27 28 29
September 34 30 31 01 02 03 04 05
35 06 07 08 09 10 11 12
36 13 14 15 16 17 18 19
37 20 21 22 23 24 25 26
38 27 28 29 30 01 02 03
October 39 04 05 06 07 08 09 10
40 11 12 13 14 15 16 17
41 18 19 20 21 22 23 24
42 25 26 27 28 29 30 31 01 All Saints / All Hallows
November 43 02 03 04 05 06 07 08 09 All Souls / Thanksgiving
44 10 11 12 13 14 15 16
45 17 18 19 20 21 22 23
46 24 25 26 27 28 29 30 01 Advent / Nicholas
December 47 02 03 04 05 06 07 08
48 09 10 11 12 13 14 15
49 16 17 18 19 20 21 22 23 Christmas
50 24 25 26 27 28 29 30 31 New Year

See also[]

External links[]

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