{"id":65871,"date":"2026-10-14T12:11:13","date_gmt":"2026-10-14T06:41:13","guid":{"rendered":"https:\/\/www.quickonlinetips.com\/archives\/?page_id=65871"},"modified":"2026-10-14T14:30:41","modified_gmt":"2026-10-14T09:00:41","slug":"week-number","status":"publish","type":"page","link":"https:\/\/www.quickonlinetips.com\/archives\/tools\/week-number\/","title":{"rendered":"What Week Is It? Week Number Today and Calendar"},"content":{"rendered":"<p>Find the <strong>week number<\/strong> for today or any date. 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var(--qt-line);border-radius:8px;background:repeating-conic-gradient(#E2E8F0 0 25%,#fff 0 50%) 0 0\/16px 16px} .qt-tool .qt-lb{display:inline-flex;width:44px;height:44px;border-radius:50%;align-items:center;justify-content:center;font-weight:700;font-size:17px;background:#fff;color:#1A202C;border:2px solid var(--qt-accent);margin:3px} .qt-tool .qt-lb.qt-bonus{background:#E53E3E;color:#fff;border-color:#E53E3E} .qt-tool .qt-8{width:230px;height:230px;border-radius:50%;margin:16px auto;background:radial-gradient(circle at 35% 30%,#666,#000 62%);display:flex;align-items:center;justify-content:center;cursor:pointer;box-shadow:0 10px 24px rgba(0,0,0,.35)} .qt-tool .qt-8 span{width:116px;height:116px;border-radius:50%;background:radial-gradient(circle,#2747a8,#0b1a4a);color:#fff;display:flex;align-items:center;justify-content:center;text-align:center;font-size:13px;font-weight:700;padding:16px;box-sizing:border-box;line-height:1.25;transition:opacity .3s} .qt-tool .qt-shake{animation:qt-shake .7s} @keyframes qt-shake{0%,100%{transform:translate(0)}20%{transform:translate(-12px,4px) rotate(-6deg)}40%{transform:translate(10px,-6px) rotate(5deg)}60%{transform:translate(-8px,6px) rotate(-4deg)}80%{transform:translate(6px,-3px) rotate(3deg)}} .qt-tool .qt-grid>.qt-field{display:flex;flex-direction:column;justify-content:flex-end} .qt-tool .qt-field input[type=range]{height:46px;padding:0 10px} .qt-tool .qt-field input[type=color]{height:46px} .qt-tool .qt-drop .qt-sub{font-weight:400;font-size:14px;margin:4px 0 0} .qt-tool .qt-board{display:grid;gap:5px;margin:14px auto 0;max-width:100%;user-select:none;-webkit-user-select:none;touch-action:manipulation} .qt-tool .qt-cell{display:flex;align-items:center;justify-content:center;background:#fff;border:1px solid #AEC3DB;border-radius:6px;font-weight:700;cursor:pointer;aspect-ratio:1;font-size:clamp(14px,4vw,26px);color:#1A202C;padding:0;min-width:0;font-family:inherit;line-height:1} .qt-tool .qt-cell:disabled{cursor:default} .qt-tool .qt-win{background:#C6F6D5;border-color:#38A169} .qt-tool .qt-sel{background:#BEE3F8;border-color:#3182CE} .qt-tool .qt-bad{background:#FED7D7;border-color:#E53E3E} .qt-tool select{-webkit-appearance:none;-moz-appearance:none;appearance:none;padding-right:40px;cursor:pointer;border:2px solid #90B4DA;font-weight:600;background-color:#fff;background-image:url(\"data:image\/svg+xml,%3Csvg xmlns='http:\/\/www.w3.org\/2000\/svg' viewBox='0 0 14 9'%3E%3Cpath d='M1.5 1.5l5.5 5.5 5.5-5.5' fill='none' stroke='%232B6CB0' stroke-width='2.4' stroke-linecap='round' stroke-linejoin='round'\/%3E%3C\/svg%3E\");background-repeat:no-repeat;background-position:right 14px center;background-size:14px 9px} .qt-tool select:hover{border-color:var(--qt-accent);background-color:#F4F8FD} .qt-tool select::-ms-expand{display:none} .qt-next{margin:0 0 1.75em} .qt-next .qt-next-h{font-size:14px;font-weight:700;letter-spacing:.05em;text-transform:uppercase;color:#4A5568;margin:0 0 8px} .qt-next-g{display:grid;grid-template-columns:repeat(3,1fr);gap:8px} .qt-next-g a{display:flex;align-items:center;min-height:46px;padding:9px 12px;border:1px solid #AEC3DB;border-radius:8px;background:#F4F8FD;color:#215387;font-weight:600;font-size:15px;line-height:1.3;text-decoration:none} .qt-next-g a:hover,.qt-next-g a:focus{background:#E3EEFF;border-color:#2B6CB0;text-decoration:none} @media (max-width:600px){.qt-next-g{grid-template-columns:repeat(2,1fr)}}<\/style>\n<div class=\"qt-tool\" id=\"qt-wn\">\n<div class=\"qt-result qt-roman\" id=\"qt-wn-big\" aria-live=\"polite\" style=\"font-size:30px\"><\/div>\n<div class=\"qt-grid\">\n<div class=\"qt-field\"><label for=\"qt-wn-d\">Date<\/label><input type=\"date\" id=\"qt-wn-d\"><\/div>\n<div class=\"qt-field\"><label for=\"qt-wn-y\">Show weeks of year<\/label><input type=\"number\" id=\"qt-wn-y\" min=\"1900\" max=\"2200\"><\/div>\n<\/div>\n<div class=\"qt-stats\">\n<div class=\"qt-stat\"><span class=\"qt-num\" id=\"qt-wn-iso\">&#8211;<\/span><span class=\"qt-lab\">ISO week<\/span><\/div>\n<div class=\"qt-stat\"><span class=\"qt-num\" id=\"qt-wn-us\">&#8211;<\/span><span class=\"qt-lab\">US week (Sunday start)<\/span><\/div>\n<div class=\"qt-stat\"><span class=\"qt-num\" id=\"qt-wn-doy\">&#8211;<\/span><span class=\"qt-lab\">Day of year<\/span><\/div>\n<div class=\"qt-stat\"><span class=\"qt-num\" id=\"qt-wn-tot\">&#8211;<\/span><span class=\"qt-lab\">ISO weeks this year<\/span><\/div>\n<\/div>\n<div class=\"qt-status\" id=\"qt-wn-status\" aria-live=\"polite\"><\/div>\n<table class=\"qt-table\">\n<thead>\n<tr>\n<th>Week<\/th>\n<th>Monday<\/th>\n<th>Sunday<\/th>\n<\/tr>\n<\/thead>\n<tbody id=\"qt-wn-out\"><\/tbody>\n<\/table>\n<p class=\"qt-note\">Everything runs in your browser. Nothing you enter is sent to or stored on our server.<\/p>\n<\/div>\n<p><script>(function () { function qtReady(fn) { if (document.readyState === 'loading') { document.addEventListener('DOMContentLoaded', fn); } else { fn(); } } function qtCopy(text, statusEl, okMsg) { function done(ok) { if (statusEl) { statusEl.textContent = ok ? (okMsg || 'Copied to clipboard.') : 'Press Ctrl+C (or Cmd+C) to copy.'; } } function fallback() { var ta = document.createElement('textarea'); ta.value = text; ta.setAttribute('readonly', ''); ta.style.position = 'fixed'; ta.style.top = '-1000px'; document.body.appendChild(ta); ta.select(); var ok = false; try { ok = document.execCommand('copy'); } catch (e) { ok = false; } document.body.removeChild(ta); done(ok); } if (navigator.clipboard) { if (window.isSecureContext) { navigator.clipboard.writeText(text).then(function () { done(true); }, fallback); return; } } fallback(); } function qtRand32() { var c = window.crypto || window.msCrypto; if (c) { if (c.getRandomValues) { var a = new Uint32Array(1); c.getRandomValues(a); return a[0]; } } return Math.floor(Math.random() * 4294967296); } function qtRandInt(range) { if (range === 4294967296) { return qtRand32(); } var limit = Math.floor(4294967296 \/ range) * range; var x = qtRand32(); while (x >= limit) { x = qtRand32(); } return x % range; } qtReady(function () { var dEl = document.getElementById('qt-wn-d'); if (!dEl) { return; } function $(id) { return document.getElementById(id); } var DAY = 864e5; function pad(n) { return (n > 9 ? '' : '0') + n; } function iso(t) { var d = new Date(t); var day = d.getUTCDay() || 7; d.setUTCDate(d.getUTCDate() + 4 - day); var y = d.getUTCFullYear(); return [y, Math.ceil(((d - Date.UTC(y, 0, 1)) \/ DAY + 1) \/ 7)]; } function weeks(y) { return iso(Date.UTC(y, 11, 28))[1]; } function monday(y, w) { var j4 = Date.UTC(y, 0, 4); var day = new Date(j4).getUTCDay() || 7; return j4 - (day - 1) * DAY + (w - 1) * 7 * DAY; } function fmt(t, long) { return new Date(t).toLocaleDateString('en-US', { timeZone: 'UTC', weekday: long ? 'long' : 'short', month: 'short', day: 'numeric', year: 'numeric' }); } function parse(v) { var m = v.match(\/^(\\d{4})-(\\d\\d)-(\\d\\d)$\/); return m ? Date.UTC(+m[1], +m[2] - 1, +m[3]) : NaN; } var now = new Date(), today = Date.UTC(now.getFullYear(), now.getMonth(), now.getDate()); var cur = iso(today); function table() { var y = parseInt($('qt-wn-y').value, 10), body = $('qt-wn-out'); body.textContent = ''; if (!(y >= 1900)) { return; } if (y > 2200) { return; } for (var w = 1; weeks(y) >= w; w++) { var m = monday(y, w), tr = document.createElement('tr'); [String(w), fmt(m), fmt(m + 6 * DAY)].forEach(function (x) { var td = document.createElement('td'); td.textContent = x; tr.appendChild(td); }); if (y === cur[0]) { if (w === cur[1]) { tr.style.fontWeight = '700'; tr.className = 'qt-ok'; } } body.appendChild(tr); } } function upd() { var t = parse(dEl.value); if (!isFinite(t)) { return; } var i = iso(t), d = new Date(t), y = d.getUTCFullYear(); var j1 = Date.UTC(y, 0, 1), doy = Math.round((t - j1) \/ DAY) + 1; var us = Math.floor((doy - 1 + new Date(j1).getUTCDay()) \/ 7) + 1; $('qt-wn-iso').textContent = i[1]; $('qt-wn-us').textContent = us; $('qt-wn-doy').textContent = doy; $('qt-wn-tot').textContent = weeks(i[0]); var m = monday(i[0], i[1]); $('qt-wn-big').textContent = (t === today ? 'This is week ' : 'Week ') + i[1] + (i[0] !== y ? ' of ' + i[0] : ''); $('qt-wn-status').textContent = fmt(t, true) + ' is in ISO week ' + i[0] + '-W' + pad(i[1]) + ', which runs from ' + fmt(m) + ' to ' + fmt(m + 6 * DAY) + '.' + (i[0] !== y ? ' Early January and late December days can belong to the next or previous ISO year.' : ''); } dEl.value = now.getFullYear() + '-' + pad(now.getMonth() + 1) + '-' + pad(now.getDate()); $('qt-wn-y').value = cur[0]; dEl.addEventListener('input', function () { upd(); var t = parse(dEl.value); if (isFinite(t)) { var yy = iso(t)[0]; if (+$('qt-wn-y').value !== yy) { $('qt-wn-y').value = yy; table(); } } }); $('qt-wn-y').addEventListener('input', table); upd(); table(); }); })();<\/script><\/p>\n<div class=\"qt-next\">\n<p class=\"qt-next-h\">Try another free tool<\/p>\n<div class=\"qt-next-g\"><a href=\"https:\/\/www.quickonlinetips.com\/archives\/tools\/time-zone-converter\/\">Time Zone Converter<\/a><a href=\"https:\/\/www.quickonlinetips.com\/archives\/tools\/countdown-to-date\/\">Countdown to a Date<\/a><a href=\"https:\/\/www.quickonlinetips.com\/archives\/tools\/day-of-the-week\/\">Day of the Week Calculator<\/a><a href=\"https:\/\/www.quickonlinetips.com\/archives\/tools\/sleep-calculator\/\">Sleep Calculator<\/a><a href=\"https:\/\/www.quickonlinetips.com\/archives\/tools\/pomodoro-timer\/\">Pomodoro Timer<\/a><a href=\"https:\/\/www.quickonlinetips.com\/archives\/tools\/days-between-dates\/\">Days Between Dates<\/a><\/div>\n<\/div>\n<p><strong>Quick answer:<\/strong> The big number at the top is the current ISO week. ISO weeks start on Monday, and week 1 is the week that contains the first Thursday of January, so a year has 52 or 53 weeks.<\/p>\n<h2>How to find the week number<\/h2>\n<ol>\n<li>The tool opens on today&#8217;s date and shows this week&#8217;s number straight away.<\/li>\n<li>Pick any other date to get its ISO week, its US week number and its day of the year.<\/li>\n<li>Change the year to list every week with its Monday and Sunday dates. The current week is highlighted.<\/li>\n<\/ol>\n<h2>ISO week numbers explained<\/h2>\n<p>The ISO 8601 standard is used across Europe, in much of Asia and in most planning, payroll and manufacturing software. Its rules are simple:<\/p>\n<ul>\n<li>Weeks start on <strong>Monday<\/strong> and end on Sunday.<\/li>\n<li><strong>Week 1<\/strong> is the week with the year&#8217;s first Thursday in it, which is the same as the week that contains January 4.<\/li>\n<li>Most years have 52 weeks. Years that start on a Thursday, and leap years that start on a Wednesday, have <strong>53<\/strong>.<\/li>\n<li>Because of this, January 1 to 3 can belong to the last week of the previous year, and December 29 to 31 can be in week 1 of the next year.<\/li>\n<\/ul>\n<p>ISO weeks are written like <strong>2026-W42<\/strong>, or with a day number, such as 2026-W42-3 for the Wednesday.<\/p>\n<h2>US week numbers<\/h2>\n<p>Calendars in the United States, Canada and some other countries usually start weeks on Sunday and call the week containing January 1 &#8220;week 1&#8221;. That can give a number one higher than the ISO week. Outlook, Google Calendar and Excel can show either system, so check which one your team uses.<\/p>\n<h2>Week numbers in Excel and Google Sheets<\/h2>\n<p>Use <code>=ISOWEEKNUM(A1)<\/code> for the ISO week, or <code>=WEEKNUM(A1)<\/code> for the US-style week starting on Sunday. In Google Sheets, <code>=WEEKNUM(A1, 21)<\/code> also returns the ISO week.<\/p>\n<p>More date tools: find the weekday of any date with the <a href=\"https:\/\/www.quickonlinetips.com\/archives\/tools\/day-of-the-week\/\">day of the week calculator<\/a>, count the gap between two dates with <a href=\"https:\/\/www.quickonlinetips.com\/archives\/tools\/days-between-dates\/\">days between dates<\/a>, or count down to an event with the <a href=\"https:\/\/www.quickonlinetips.com\/archives\/tools\/countdown-to-date\/\">countdown timer<\/a>.<\/p>\n<h2>FAQ<\/h2>\n<h3>What week of the year is it?<\/h3>\n<p>The number at the top of the tool is today&#8217;s ISO week, based on your device&#8217;s date.<\/p>\n<h3>How many weeks are in a year?<\/h3>\n<p>52 weeks and 1 day, or 52 weeks and 2 days in a leap year. In ISO terms a year has either 52 or 53 numbered weeks.<\/p>\n<h2>More free tools<\/h2>\n<div class=\"qt-cards\"><a class=\"qt-card\" href=\"https:\/\/www.quickonlinetips.com\/archives\/tools\/time-zone-converter\/\"><strong>Time Zone Converter<\/strong><span>Compare times across cities and plan meetings.<\/span><\/a><a class=\"qt-card\" href=\"https:\/\/www.quickonlinetips.com\/archives\/tools\/countdown-to-date\/\"><strong>Countdown to a Date<\/strong><span>Live countdown to any date, event or holiday.<\/span><\/a><a class=\"qt-card\" href=\"https:\/\/www.quickonlinetips.com\/archives\/tools\/day-of-the-week\/\"><strong>Day of the Week Calculator<\/strong><span>Find the weekday for any date in history.<\/span><\/a><a class=\"qt-card\" href=\"https:\/\/www.quickonlinetips.com\/archives\/tools\/sleep-calculator\/\"><strong>Sleep Calculator<\/strong><span>Best times to wake up or go to bed by sleep cycles.<\/span><\/a><a class=\"qt-card\" href=\"https:\/\/www.quickonlinetips.com\/archives\/tools\/pomodoro-timer\/\"><strong>Pomodoro Timer<\/strong><span>25-minute focus timer with breaks and alerts.<\/span><\/a><a class=\"qt-card\" href=\"https:\/\/www.quickonlinetips.com\/archives\/tools\/days-between-dates\/\"><strong>Days Between Dates<\/strong><span>Count days, weeks and business days between two dates.<\/span><\/a><a class=\"qt-card\" href=\"https:\/\/www.quickonlinetips.com\/archives\/tools\/age-calculator\/\"><strong>Age Calculator<\/strong><span>Your exact age in years, months and days, plus next birthday.<\/span><\/a><a class=\"qt-card\" href=\"https:\/\/www.quickonlinetips.com\/archives\/tools\/percentage-calculator\/\"><strong>Percentage Calculator<\/strong><span>Work out X% of Y, percent change and more.<\/span><\/a><a class=\"qt-card\" href=\"https:\/\/www.quickonlinetips.com\/archives\/tools\/online-stopwatch\/\"><strong>Stopwatch and Timer<\/strong><span>Online stopwatch with laps and a countdown timer with alarm.<\/span><\/a><\/div>\n<p>See all of them on the <a href=\"https:\/\/www.quickonlinetips.com\/archives\/tools\/\">QuickOnlineTips free online tools<\/a> page and play our <a href=\"https:\/\/www.quickonlinetips.com\/archives\/games\/\">free online games<\/a>.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Find the week number for today or any date. The tool shows the ISO 8601 week used in Europe, Asia and most business calendars, where weeks start on Monday, plus the US-style week number that starts on Sunday, and a full list of every week in the year with its dates. Date Show weeks of&#8230;<\/p>\n","protected":false},"author":4,"featured_media":0,"parent":65595,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_kad_post_transparent":"","_kad_post_title":"","_kad_post_layout":"","_kad_post_sidebar_id":"","_kad_post_content_style":"","_kad_post_vertical_padding":"","_kad_post_feature":"","_kad_post_feature_position":"","_kad_post_header":false,"_kad_post_footer":false,"_kad_post_classname":"","footnotes":""},"class_list":["post-65871","page","type-page","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.quickonlinetips.com\/archives\/wp-json\/wp\/v2\/pages\/65871","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.quickonlinetips.com\/archives\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/www.quickonlinetips.com\/archives\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/www.quickonlinetips.com\/archives\/wp-json\/wp\/v2\/users\/4"}],"replies":[{"embeddable":true,"href":"https:\/\/www.quickonlinetips.com\/archives\/wp-json\/wp\/v2\/comments?post=65871"}],"version-history":[{"count":3,"href":"https:\/\/www.quickonlinetips.com\/archives\/wp-json\/wp\/v2\/pages\/65871\/revisions"}],"predecessor-version":[{"id":66444,"href":"https:\/\/www.quickonlinetips.com\/archives\/wp-json\/wp\/v2\/pages\/65871\/revisions\/66444"}],"up":[{"embeddable":true,"href":"https:\/\/www.quickonlinetips.com\/archives\/wp-json\/wp\/v2\/pages\/65595"}],"wp:attachment":[{"href":"https:\/\/www.quickonlinetips.com\/archives\/wp-json\/wp\/v2\/media?parent=65871"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}