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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.
Maswali yaliyoulizwa mara nyingi
Idadi ya juma la ISO inafasiliwaje?
Under ISO 8601 weeks start on Monday and week 1 is the week that contains the first Thursday of the year — equivalently, the week containing 4 January. This is why early-January and late-December dates can belong to a neighbouring year.
Kwa nini mwaka wa ISO nyakati nyingine hutofautiana na mwaka wa kalenda?
Tarehe za Januari kwanza zinaweza kuanguka katika juma lililopita la ISO la mwaka uliopita, na tarehe za mwishoni mwa mwezi zitaanguka juma 1 mwaka ujao. Mwaka wa ISO unaonesha mwaka ambao wiki moja ni ya mwaka huu.
Ni robo gani ya tarehe yenyewe?
Robo ni robo ya tarehe ya tarehe ya kawaida: Q1 ni Januari Tourinet, Q2 April Color JJuni, Q3 July3 jujus 1, na Q4 Oktoba 1,2 Oktoba (2 / 10 / 2007) ok.
Ni majuma mangapi kwa mwaka?
Chini ya kituo cha ISO 8601 kwa mwaka mmoja, kuna majuma 52 kwa miaka mingi na 53 katika muda mfupi (wakati Januari 1 au miaka 31 Desemba inapokuwa Alhamisi). Chombo hicho kinakuambia ni majuma mangapi ya kituo cha ISO yanayobaki katika mwaka huu.
Kuna tofauti gani kati ya ISO na idadi ya Marekani ya watu wanaohesabiwa?
KIPOKUWA hapa basi, juma la 1 huanza Jumatatu kwa juma moja, tarehe 1 Alhamisi ya kwanza. Mkusanyiko wa kawaida wa Marekani huanza Jumapili na unaita juma la 1 la Januari 1.
CW au KW humaanisha nini katika kalenda?
CW (juma ya mwisho) na KW (Kalendwoche ya Ujerumani) ni majina ya nambari ya kituo cha ISO HISKW 34 ni wiki 34.
API bustanini hutumia kifaa hiki cha hesabu kutoka kwenye mfumo wa sheria
Ipigie simu kifaa hiki cha kupigia hesabu kama Junse É not doot toder. Chochote unachoacha kinatumia kiwango kilekile cha mwisho ambacho ukurasa huu haujakamilika; parameta isiyojulikana ni 400, si sufuri kimya kamwe. Soma habari kamili za API docs →
keyboard label
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);Matokeo ni makadirio ya mwongozo wa ujumla, si wa kifedha, wa kitiba au wa kodi tu.