Àwọn Àwọn Àkọ́lé

Wá ọjọ́ tí asiko kan bá jẹ́, fún àwọn ààyè-iṣẹ́ tí tí kọja àti àwọn ààyè-iṣẹ́ tí tí wá.

Ọjọ́ àìpẹ̀ —

Àwọn àyọkà ìṣàmúlò-ètò —

Àwọn àwọn ààyè-iṣẹ́ —

Àwọn àwọn —

Àwọn ìrísí-lẹ́tà —

Àwọn Àtòjọ-ẹ̀yàn àwọn ìṣàmúlò-ètò

Ńlà àwọn àwọn ààtò àtòjọ-ẹ̀yàn yìí?

Àkóónú ìṣàmúlò-ètò yìí

A day of the week calculator tells you which day a given date lands on — Monday through Sunday — for any date, past or future, using the browser’s proleptic Gregorian calendar. Alongside the weekday it reports the day number within the year (1–365 or 366), the ISO-8601 week number, whether the year is a leap year, and how many days remain until the end of the year. It is handy for planning events, checking historical dates, or working out which weekday a birthday or anniversary falls on in a future year.

You simply enter a date (or leave it blank for today) and it maps that date to a definite weekday using the proleptic Gregorian calendar built into every browser — the modern calendar rules projected consistently backward and forward in time. The same lookup yields the day-of-year number, the ISO week the date belongs to, and whether that year carries a 29 February, so a single answer covers several common questions at once.

For example, 4 July 1776 was a Thursday, and 1 January 2000 was a Saturday; enter your own birthdate and you can see which weekday you were born on, then check which weekday it falls on this year. People use it to plan events onto a particular weekday, settle "what day was I born" questions, verify a historical date, or work out that a fixed-date holiday shifts to a new weekday each year.

Àwọn Àtòjọ-ẹ̀yàn

Bawo ní a ṣe lè fi àwọn ọjọ́ tí a tí ìwé kọ̀ǹpútà pamọ́?

The calculator uses the proleptic Gregorian calendar (the same one built into every browser), which projects today’s calendar rules backward and forward, so any date maps to a definite weekday from Monday to Sunday.

Àwọn àwọn

Under ISO 8601, weeks start on Monday and week 1 is the week containing the first Thursday of the year (equivalently, the week with 4 January). That means early-January or late-December dates can belong to week 52/53 of the neighbouring year.

Does it work for dates before 1900 or far in the future?

Ya. Nítorí pé o ló kalẹ́ndà proleptic Gregorian, ò ń gbọ́wọ́lú àwọn ààyè ìtàn àti àwọn ààyè ìtàn nípa ìdáràn, àwọn ààyè ìtàn tí a lò nípa àwọn ààyè ìtàn (gẹ́gẹ́ bíi Julian) lè ń yatọ.

Àwọn ọjọ́ wo ni mò bí?

Enter your date of birth and the calculator names the weekday it fell on, plus the day-of-year number and whether it was a leap year — a quick way to settle "what day was I born".

Kini idi ti ọjọ́ ibílẹ̀ jẹ́ ní ọjọ́ tí a fi ṣẹ́gun ní gbogbo odun?

Òṣù kan ní ọjọ́ 365, tí ó jẹ́ àwọn àkókò 52 àti ọjọ́ kan tí a fi kun, láti jẹ́ pé àwọn ààyè tí a fi àwọn ààyè pàtó nígbà kan láti gbá ìjádé nígbà kan ní gbogbo òṣù, àti àwọn ààyè meji nígbà kan. Fi àwọn ààyè fún àwọn oṣù kékeré láti wò àwọn ìpèwọ̀n.

Fi àwọn ààyè-iṣẹ́ àìdálẹ̀ kùnà - ohun tí ó ń ṣẹlẹ̀?

Tó bá fi ààyè náà pàtó, ìṣàmúlò-ètò náà náà á ló àwọn ààyè ọjọ́ yìí, láti jẹ́ pé o jẹ́ "ọ̀jọ̀ wò ní ọjọ́ yìí" àti àwọn

Ó sọ mì láti mọ́ pé òjó náà jẹ́ ọdun ìtàn?

Ya. O sọ nígbà tí o bá jẹ́ pé oṣù àwọn ààtòjọ-ẹ̀yàn ní ọduń tí a fi pẹ́ (366 ọjọ́) tàbí oṣù tí a fi pẹ́ (365 ọjọ́), tí o tun sọ̀rọ̀ fún idì tí ọjọ́-ọ̀jọ́-ìgbà lè bá 366 lọ́wọ́lọ́wọ́.

API — ló àwọn ìṣàmúlò-ètò yìí láti inú ìṣàmúlò-ètò

Fi àwọn ìṣàmúlò-ètò yìí kọ̀ǹpútà yìí láti jẹ́ ààyè-iṣẹ́ JSON tí a tí fi pamọ́ - kò ní bọ́tìnì kan tí a fẹ́. Fi àwọn fálù ààyè-iṣẹ́ sílẹ̀ sí bí àwọn àwọn ìṣàmúlò-ètò àti JSON. Anything you omit uses the same default this page is pre-filled with; an unknown parameter is a 400, never a silent zero. Ka àwọn àkọlé API kíkún →

Àwọn Ààyè Ìjánu-ìṣàmúlò-ètò

GET https://calculator.free/api/v1/day-of-the-week/

curl

curl "https://calculator.free/api/v1/day-of-the-week/?date=2026-09-09"

JavaScript `fetch()`

const r = await fetch(
  "https://calculator.free/api/v1/day-of-the-week/?" + new URLSearchParams({
    "date": "2026-09-09"
  }));
const data = await r.json();
console.log(data.results);

Results are estimates for general guidance only, not financial, medical or tax advice.

Àkóónú ìṣàmúlò-ètò yìí

Àwọn Àtòjọ-ẹ̀yàn

Àwọn Ìṣàmúlò-ètò Ìṣàmúlò-ètò

Àwọn Ààyè Ìjánu-ìṣàmúlò-ètò

curl

JavaScript fetch()

JavaScript `fetch()`