Time and the Calendar
The four-day week and its orisa, the lunar month and the thirteen-month year, how festivals were dated, and how a four-day week now coexists with a seven-day one.
The Yoruba reckoned time on a four-day week. Everything else in the system, the market cycle, the ritual round, the month and the year, is built on that unit and on its multiples of eight and sixteen . The four-day week is not an antiquarian detail: it is still what most Yoruba markets run on, even though the days are now counted by their English names .
Confidence on this file is marked contested for a specific reason. The four-day week, the association of its days with òrìṣà and the general use of four and its multiples are well attested. The full annual calendar, its thirteen named months and their alignment to the Gregorian year, is documented in a much thinner literature, is reconstructed largely from the practice of contemporary traditional worshippers rather than from deep historical record, and circulates online in versions that disagree with one another and with the scholarship. Where a claim rests on that thinner base, this file says so.
The four-day week
The traditional week, ọ̀sẹ̀, is four days, and each day belongs to an òrìṣà. The oral tradition, attributed in the Ifá literature to the odù Ọ̀fún and Ogbè Ọ̀bàrà, is that the four-day week was bestowed upon the òrìṣà by Elédùmarè . The days as recorded by Sogbesan:
- Day 1: Ọ̀sẹ̀ Ògún, for Ògún
- Day 2: Ọ̀sẹ̀ Ṣàngó, also called Jàkúta, for Ṣàngó
- Day 3: Ọ̀sẹ̀ Ọbàtálá, for Ọbàtálá
- Day 4: Ọ̀sẹ̀ Ayọ̀, joy, for the other òrìṣà
The ordering is not uniform. Lineages and regional traditions place the days in different sequences, and different published lists start the week at different points, so a reader who encounters a different order elsewhere has not necessarily found an error. What is stable across the accounts is that there are four days, that each carries a devotional obligation, and that Ọ̀rúnmìlà and Ifá are attached to the cycle: Omo-Dare's work on Ifá records that Ifá priests meet on the first day of the Yoruba week , which is the practice known as Ọ̀sẹ̀ Ifá, the four-day Ifá observance still kept by babaláwo.
The Ifá verse Omo-Dare cites deserves careful handling, because the translation has been disputed.
Ifá lolòní Ifá lolòla Ifá ló lọ́túnla pẹ̀lú ẹ Ọ̀rúnmìlà ló jí ná mẹ́rẹ̀ẹ̀rin òòsà dààyé
Ifá / owns / today, Ifá / owns / tomorrow, Ifá / owns / the-day-after-tomorrow / with / you, Ọ̀rúnmìlà / is-the-one-who / [awoke and] / the-four / òrìṣà / [brought/established] to-earth.
Ifa is the master of today Ifa is the master of tomorrow Ifa is the master of the day after tomorrow To Ifa belongs all the four days established by God on earth
Translator: the English is Omo-Dare's as reproduced by Sogbesan; the transcription follows Sogbesan's, with diacritics added here, and the literal gloss is mine.
Sogbesan flags the disagreement directly: the verse points to four deities, and the final line's translation as "to Ifa belongs all the four days established by God on earth" does not establish that the four days created belong to Ifá . On his reading the Yoruba says that Ọ̀rúnmìlà brought the four òrìṣà to earth, which is a claim about deities, and the English translation converts it into a claim about days owned by Ifá, which is a claim about the calendar. This is a small but instructive case of a translation carrying an institutional interest, and the reader should note that the first three lines do plainly count off three successive days, so the association of the verse with the day cycle is not invented, only the ownership claim in the fourth line is contestable. Sogbesan's transcription is given without tone marks in the original publication; the diacritics here are reconstructed and should be treated as medium confidence.
Why four. Sogbesan reports the Aboòrìṣà rationale as cosmological rather than arbitrary: the reckoning rests on the number four and its multiples of eight and sixteen, tied to a conception of the universe as having begun from four corners which gather to a centre to form the circle, a configuration called òrìta, the crossroads . He extends the same principle to settlement planning, with the village head's house at the centre and the compounds radiating from it, and the compound head's house at the centre of the family compound . Whether or not one accepts the cosmological derivation, the observation that four-part organisation recurs across the calendar, the divination system and the built environment is a real one, and sixteen, ẹ̀rìndínlógún, is of course the number of principal odù.
Market and week are the same thing. Markets ran on the four-day cycle with neighbouring towns staggered, so that the week a trader lived by and the week a worshipper lived by were one week. This is treated in Economy and the Market. Sogbesan's observation that most Yoruba markets are still spaced on the four-day week while the days themselves are counted by Anglo-Saxon names is the sharpest single illustration of what happened to Yoruba time .
The month and the year
Òṣù is the month and òdún the year. On the reconstruction Sogbesan gives from the Aboòrìṣà of Ọ̀yọ́ town, the year comprises four-day weeks, seven weeks to a twenty-eight day month, thirteen months to a year, giving ninety-one weeks and three hundred and sixty-four days .
The month is lunar in origin, which is what a twenty-eight day month and thirteen months signify, and òṣù is also the word for moon. Thirteen lunar months of twenty-eight days is an idealisation rather than an astronomical fit, since the synodic month is about 29.5 days, so any working lunar calendar requires observation and adjustment rather than arithmetic alone.
Crucially, Sogbesan records that unlike the Gregorian calendar the Yoruba calendar does not begin on a fixed day or month, and that traditional festivals have no fixed date and vary from town to town . This is the most important structural fact about Yoruba time and it is routinely lost in modern presentations. The year began with an observed event, not with a date: the Aboòrìṣà account is that the new year starts with the arrival of the seasonal rains that sprout new leaves on the trees . The associated proverb Sogbesan records:
Oníra ni kẹ́ bọ lọ Ìràwé ni dé bọ le
Oníra / is-the-one / takes / the-offering / out, Ìràwé / is-the-one / brings / the-offering / in.
Onira puts the offering out Irawe brings the offering in
Translator: Sogbesan, who gives it as a Yoruba proverb without further attribution; the literal gloss is mine and the diacritics are reconstructed, so treat as medium confidence.
Ìràwé is the first month of the year on Sogbesan's table and Oníra is the last-named festival month, so the proverb is a mnemonic for the year's boundary: the offerings go out at one end of the cycle and come back in at the other. Ìràwé is also an ordinary Yoruba word for dry or fallen leaves, which is why the name attaches to the month at the turn of the season when the old leaves go and the new ones come. English cannot carry the double sense of the month name and the leaf simultaneously.
The thirteen months, with the Gregorian alignment and associated festivals that Sogbesan records from Ọ̀yọ́ town :
| # | Òṣù | Gregorian | Festivals recorded |
|---|---|---|---|
| 1 | Òṣù Ìràwé (New Year) | April/May | Òòṣà Èfú |
| 2 | Òṣù Egúngún | May/June | Ìyámàpó |
| 3 | Òṣù Àlànù | June/July | Egúngún |
| 4 | Òṣù Yemọja | July/August | Ṣàngó |
| 5 | Òṣù Òòṣà Oko | Aug/Sept | Ṣàngó, Yemọja, Ọ̀ṣun |
| 6 | Òṣù Orún | Sept/Oct | Èṣù, Òòṣà Oko |
| 7 | Òṣù Gbáyanrin | Oct/Nov | Orún |
| 8 | Òṣù Ògún | Nov/Dec | Ògún |
| 9 | Òṣù Irá | Dec/Jan | Ọya |
| 10 | Òṣù Beere | Jan/Feb | Obàlúayé, Ṣàngó |
| 11 | Òṣù Àlénù | Feb/Mar | (recorded as impractical for farming) |
| 12 | Òṣù Aláràn Ọ̀yígí | Mar/April | |
| 13 | Òṣù Molè | April | Molè |
Two cautions. This table is one town's practice, recorded from contemporary traditional worshippers at Ọ̀yọ́ and published in 2022, and it should not be taken as the Yoruba calendar in general. And the widely circulated online claim that the Yoruba year runs from 3 June to 2 June, with the era count known as Kọ́jọ́dá , does not match this scholarly reconstruction, which places the new year at the rains in April or May and states explicitly that the year does not begin on a fixed date. The Kọ́jọ́dá era numbering, which produces year counts in the ten thousands, circulates almost entirely in practitioner and diaspora sources without scholarly corroboration, and this corpus does not endorse it. Where a fixed 3 June new year is now observed, it is a modern standardisation of an observational calendar, which is a legitimate contemporary practice but is not evidence about the precolonial one.
The seasons were the operative agricultural division, subdivided by rain type, and Sogbesan's table records names for them: Ìràwé, Ògìnnìntìn (cold rain), Èwo (small rain), Àrámoká (strong rain), Òyé (the cold noisy wind, the harmattan), Èèrùn (dry), Bàárú (dryness with small night rain), Ìjì (strong wind) and Ejidún (the first daily rain) . A farmer navigating by nine named rain and wind conditions is navigating by observation of the actual weather, not by a date, which is the same principle as the moveable new year.
Days that matter
Ọjọ́ Olóyìn, the last and the first day of the month, is recorded as important because it is when farmers and hunters return to town to their families, and communities meet at the palace . That is a good illustration of how the calendar organised social life materially: a monthly boundary that pulls a dispersed population back into the town and into the presence of the ọba.
Ọ̀sẹ̀ Ifá, the four-day observance of Ifá by its priests, continues, and is the most widely practised survival of the four-day week as a religious cycle.
Annual festivals were the town's calendar. Each òrìṣà has its festival, the ọba's festivals mark the year, and the sequence of festivals through the year was what a town's ritual calendar consisted of. Because the festivals had no fixed dates and varied from town to town , the annual round was set locally, typically by the priesthood in consultation with divination and with the state of the season.
The two calendars now
The Gregorian calendar arrived with trade, was entrenched by missionary schooling and colonial administration, and is now overwhelmingly dominant. Sogbesan's account of the mechanism is direct: the seven-day week arrived with Christianity, the missionaries enforced their ideology of time through education, and the four-day week was gradually relegated to the Aboòrìṣà while the seven-day week took over political, socio-cultural and economic life .
What happened next is the interesting part. The seven-day week was indigenised. Yoruba names were supplied for the Anglo-Saxon days :
| English | Yoruba |
|---|---|
| Monday | Ajé |
| Tuesday | Ìṣẹ́gun |
| Wednesday | Ọjọ́rú |
| Thursday | Ọjọ́bọ̀ |
| Friday | Ẹtì |
| Saturday | Àbámẹ́ta |
| Sunday | Àìkú |
The names are not translations. Ajé is wealth or the deity of wealth and prosperity, Ìṣẹ́gun is victory, Àìkú is deathlessness. So the days of a Christian week acquired Yoruba names carrying Yoruba religious content, and the greeting on a Monday, wishing a person a week of ajé, still says what it says. Sogbesan makes the pointed observation that the Anglo-Saxon day names are themselves named for Germanic deities, so the choice to abandon Yoruba day names because they were associated with òrìṣà rests on a distinction that does not survive examination .
The four-day week has not disappeared. It survives in the market cycle, in Ọ̀sẹ̀ Ifá and in òrìṣà observance, and it is maintained deliberately by traditional worshippers. Sogbesan notes that the traditional calendar still serves as a reference for hunters, traders, farmers, traditional worshippers and communities in their socio-cultural activities . What has been lost is the naming and the reckoning, not entirely the rhythm.
For a reader raised Christian, the practical upshot is that they have been using a Yoruba calendar all along without knowing it. The Yoruba names of the days of the week are not a folk translation of English ones; they are an indigenous religious vocabulary that was mapped onto an imported cycle, and the four-day cycle that the imported one displaced is still running underneath it in every market in Yorubaland.