Nhazi nke ụbọchị
Chọ̀ọ́ nọmba izu ISO na ụbọchị nke afọ maka ụbọchị ọbụla.
Nhọrọ ndị ahụ ga-akpụzi mgbe ị na-etipụta.
N'ihe banyere calculator a
A week number calculator returns the ISO 8601 week number for a date — the standard used across business, logistics and Europe, where weeks run Monday to Sunday and week 1 is the week containing the first Thursday of the year. It also gives the ISO week-numbering year, the calendar quarter, the day-of-year number and how many weeks are left in the year.
Under the ISO rule a year has 52 or 53 weeks, each running Monday to Sunday, and week 1 is defined as the week that holds the year’s first Thursday (equivalently, the week containing 4 January). This is why a date in the first days of January can still belong to the last week of the previous year, and a late-December date can already sit in week 1 of the next year — the tool reports the ISO week-numbering year separately so that mismatch is clear.
For example, 1 January 2026 falls in ISO week 1 of 2026, but 1 January 2023 (a Sunday) sits in ISO week 52 of 2022. Manufacturing, shipping, publishing and European payroll systems schedule by these "CW" or "KW" week numbers, so this is the tool for answering "what week number is it", planning a delivery for "week 34", or checking which quarter a date belongs to.
Ajụjụ ndị a na-ajụkarị
Olee otú nọmba izu ISO si kọwaa?
N'okpuru ISO 8601, izu ndị ahụ na-amalite na Monday na izu 1 bụ izu nke nwere ụbọchị mbụ nke afọ ahụ - dị ka nke ahụ, izu nke nwere 4 Jenụwarị. Nke a bụ ihe mere ụbọchị nke oge mbụ Jenụwarị na nke oge nkewasị Jenụwarị nwere ike ịbụ nke afọ dị nso.
Gịnị mere afọ ISO ji dị iche n'oge ụfọdụ n'ihe gbasara afọ kalenda?
Dáánàgụ̀ na ụbọchị mbụ nke Jenụwarị nwere ike ị̀ba n'ụbọchị ISO nke ikpeazụ nke afọ gara aga, nakwa ụbọchị nke oge a na-agwụcha na Déèfọ́ọ̀ltụ̀ nwere ike ị̀ba n'ụbọchị 1 nke afọ na-esonụ. Ọnwa ISO nke ụbọchị-ọnụọgụgụ na-egosi afọ nke izu ahụ na-abịa.
Kedụ kwaịràtị nke ụbọchị ahụ nọ na ya?
The quarter is the calendar quarter of the ordinary date: Q1 is January–March, Q2 April–June, Q3 July–September and Q4 October–December.
Olee ụbọchị ole ka e nwere n'afọ?
N'okpuru ISO 8601, afọ nwere izu 52 n'ime afọ ndị kasị ukwuu na 53 n'ime aka (n'oge 1 nke Jenụwarị mọọbụ afọ nke 31 nke Desanm na-apụta na ụbọchị Mọnde). Otuto ahụ na-agwa gị ole izu ISO ka echefuru n'afọ ọfụụ.
Gịnị bụ ọdịiche dị n'etiti ISO na US ụbọchị ụbọchị?
ISO izu ụka na-amalite na Monday na izu 1 na-echekwa Thursday mbụ. US n'ozuzu ya na-amalite izu ụka na Sunday na-akpọ izu nke 1 January izu 1. Calculator a na-eji ISO ụkpụrụ, yabụ na nọmba nwere ike ịdị iche site n'otu site na US kalenda.
Gịnị bụ CW mọọbụ KW na kalenda?
CW (ụbọchị kalenda) na KW German (Kalenderwoche) bụ naanị léèbụ̀ maka ọnụọgụgụ izu ISO - CW 34 bụ izu ISO 34. Tinye ụbọchị ọbụla n'ime izu ahụ ka ịkọwa CW/KW ọbụla ọ na-emetụta.
API — jiri kaadị a site na kóòdù
Kpọọ kalkulata a dịka ebe ngwụcha JSON n'efu - enweghị kii achọrọ. Ziga valiu ebe ahụ n'okpuru dịka paramita ajụjụ mọọbụ JSON. Ihe ọbụla ị na-ewepụ na-eji dìfọ́ọ̀ltụ̀ nke a na-edebe ihuakwụkwọ a na ya; parameter a na-amaghị bụ 400, ọ dịghị sẽọ̀rọ̀. Gụọ ngwe ndị ahụ niile →
Ebemkpofuozi
GET https://calculator.free/api/v1/week-number/curl
curl "https://calculator.free/api/v1/week-number/?date=2026-09-08"JavaScript fetch()
const r = await fetch(
"https://calculator.free/api/v1/week-number/?" + new URLSearchParams({
"date": "2026-09-08"
}));
const data = await r.json();
console.log(data.results);Ihe a na-ahụta bụ n'ihi nlekọta n'ozuzu ya, ọ bụghị nlekọta ego, ọgwụ ma ọ bụ nlekọta ego.