{"id":65872,"date":"2026-10-14T12:11:15","date_gmt":"2026-10-14T06:41:15","guid":{"rendered":"https:\/\/www.quickonlinetips.com\/archives\/?page_id=65872"},"modified":"2026-10-14T14:30:39","modified_gmt":"2026-10-14T09:00:39","slug":"day-of-the-week","status":"publish","type":"page","link":"https:\/\/www.quickonlinetips.com\/archives\/tools\/day-of-the-week\/","title":{"rendered":"Day of the Week Calculator: What Day Was It?"},"content":{"rendered":"<p>This <strong>day of the week calculator<\/strong> tells you which weekday any date falls on, from the year 1 to 9999. Check the day you were born, the weekday of a historical event, or whether a future birthday falls on a weekend. 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.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-dw\">\n<div class=\"qt-grid\">\n<div class=\"qt-field\"><label for=\"qt-dw-d\">Date<\/label><input type=\"date\" id=\"qt-dw-d\" min=\"0001-01-01\" max=\"9999-12-31\"><\/div>\n<\/div>\n<div class=\"qt-row\"><button type=\"button\" class=\"qt-btn qt-btn-ghost qt-btn-sm\" data-qt-dw=\"1969-07-20\">Moon landing<\/button><button type=\"button\" class=\"qt-btn qt-btn-ghost qt-btn-sm\" data-qt-dw=\"1947-08-15\">Indian independence<\/button><button type=\"button\" class=\"qt-btn qt-btn-ghost qt-btn-sm\" data-qt-dw=\"1776-07-04\">US independence<\/button><button type=\"button\" class=\"qt-btn qt-btn-ghost qt-btn-sm\" data-qt-dw=\"2000-01-01\">Jan 1, 2000<\/button><\/div>\n<div class=\"qt-result qt-roman\" id=\"qt-dw-out\" aria-live=\"polite\" style=\"font-size:28px\"><\/div>\n<div class=\"qt-stats\">\n<div class=\"qt-stat\"><span class=\"qt-num\" id=\"qt-dw-doy\">&#8211;<\/span><span class=\"qt-lab\">Day of year<\/span><\/div>\n<div class=\"qt-stat\"><span class=\"qt-num\" id=\"qt-dw-left\">&#8211;<\/span><span class=\"qt-lab\">Days left in year<\/span><\/div>\n<div class=\"qt-stat\"><span class=\"qt-num\" id=\"qt-dw-leap\">&#8211;<\/span><span class=\"qt-lab\">Leap year<\/span><\/div>\n<div class=\"qt-stat\"><span class=\"qt-num\" id=\"qt-dw-ago\">&#8211;<\/span><span class=\"qt-lab\">Days from today<\/span><\/div>\n<\/div>\n<div class=\"qt-status\" id=\"qt-dw-status\" aria-live=\"polite\"><\/div>\n<table class=\"qt-table\">\n<thead>\n<tr>\n<th>Same date in<\/th>\n<th>Weekday<\/th>\n<\/tr>\n<\/thead>\n<tbody id=\"qt-dw-next\"><\/tbody>\n<\/table>\n<p class=\"qt-sub\" id=\"qt-dw-f13\">\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-dw-d'); if (!dEl) { return; } function $(id) { return document.getElementById(id); } var DAY = 864e5, W = ['Sunday', 'Monday', 'Tuesday', 'Wednesday', 'Thursday', 'Friday', 'Saturday']; function pad(n) { return (n > 9 ? '' : '0') + n; } function mk(y, m, d) { var t = new Date(0); t.setUTCFullYear(y, m, d); return t; } function leap(y) { return y % 4 === 0 ? (y % 100 !== 0 || y % 400 === 0) : false; } var now = new Date(), today = mk(now.getFullYear(), now.getMonth(), now.getDate()).getTime(); function upd() { var m = dEl.value.match(\/^(\\d{4,})-(\\d\\d)-(\\d\\d)$\/); if (!m) { return; } var y = +m[1], mo = +m[2] - 1, d = +m[3]; var t = mk(y, mo, d); if (t.getUTCMonth() !== mo) { $('qt-dw-out').textContent = 'That date does not exist.'; return; } var ms = t.getTime(); var long = t.toLocaleDateString('en-US', { timeZone: 'UTC', month: 'long', day: 'numeric' }) + ', ' + y; var past = today > ms, fut = ms > today; $('qt-dw-out').textContent = long + (past ? ' was a ' : (fut ? ' will be a ' : ' is a ')) + W[t.getUTCDay()]; var doy = Math.round((ms - mk(y, 0, 1).getTime()) \/ DAY) + 1, len = leap(y) ? 366 : 365; $('qt-dw-doy').textContent = doy; $('qt-dw-left').textContent = len - doy; $('qt-dw-leap').textContent = leap(y) ? 'Yes' : 'No'; var diff = Math.round((ms - today) \/ DAY); $('qt-dw-ago').textContent = (diff > 0 ? '+' : '') + diff.toLocaleString('en-US'); $('qt-dw-status').textContent = diff === 0 ? 'That is today.' : Math.abs(diff).toLocaleString('en-US') + ' days ' + (diff > 0 ? 'from now' : 'ago') + ', about ' + (Math.abs(diff) \/ 365.2425).toFixed(1) + ' years.' + (1583 > y ? ' Dates before 1583 use the modern Gregorian calendar extended backwards; historical records may use the Julian calendar.' : ''); var body = $('qt-dw-next'); body.textContent = ''; var cy = now.getFullYear(), got = 0; for (var yy = Math.max(cy, y + 1); got !== 8; yy++) { if (yy - cy > 40) { break; } var tt = mk(yy, mo, d); if (tt.getUTCMonth() !== mo) { continue; } got++; var tr = document.createElement('tr'), a = document.createElement('td'), b = document.createElement('td'); a.textContent = String(yy); b.textContent = W[tt.getUTCDay()]; if (tt.getUTCDay() % 6 === 0) { b.className = 'qt-ok'; } tr.appendChild(a); tr.appendChild(b); body.appendChild(tr); } var f = []; for (var k = 0; 12 > k; k++) { if (mk(y, k, 13).getUTCDay() === 5) { f.push(mk(y, k, 13).toLocaleDateString('en-US', { timeZone: 'UTC', month: 'long' })); } } $('qt-dw-f13').textContent = 'Friday the 13th in ' + y + ': ' + (f.length ? f.join(', ') : 'none') + '.'; } dEl.value = now.getFullYear() + '-' + pad(now.getMonth() + 1) + '-' + pad(now.getDate()); dEl.addEventListener('input', upd); Array.prototype.forEach.call(document.querySelectorAll('[data-qt-dw]'), function (b) { b.addEventListener('click', function () { dEl.value = b.getAttribute('data-qt-dw'); upd(); }); }); upd(); }); })();<\/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\/week-number\/\">Week Number<\/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> Pick a date and the tool says which day of the week it was or will be. For example, July 20, 1969 (the Moon landing) was a Sunday, and January 1, 2000 was a Saturday.<\/p>\n<h2>How to use the day of the week calculator<\/h2>\n<ol>\n<li>Choose a date with the date picker or type it in. It opens on today.<\/li>\n<li>Read the weekday in the large text, plus the day of the year and how many days ago or ahead it is.<\/li>\n<li>Check the table to see which weekday the same date falls on in the coming years. Weekends are in green, handy for planning birthdays and anniversaries.<\/li>\n<li>Try a preset to see the weekday of a famous date.<\/li>\n<\/ol>\n<h2>How to work out the day of the week in your head<\/h2>\n<p>Mathematician John Conway&#8217;s <strong>Doomsday rule<\/strong> lets you find any weekday with a little practice. Each year has a &#8220;doomsday&#8221;, a weekday shared by easy-to-remember dates: 4\/4, 6\/6, 8\/8, 10\/10, 12\/12, 5\/9, 9\/5, 7\/11, 11\/7, the last day of February and March 14 (Pi Day). In 2026 the doomsday is Saturday, so October 10, 2026 is a Saturday, and October 14 is four days later, a Wednesday.<\/p>\n<p>The doomsday moves forward one weekday each year, and two after a leap day. The anchor days for each century are Tuesday for the 1900s, Wednesday for the 2000s and Friday for the 2100s.<\/p>\n<h2>Leap years<\/h2>\n<p>A year is a leap year if it divides by 4, except century years, which must divide by 400. So 2000 and 2024 were leap years, while 1900 and 2100 are not. A date moves forward one weekday each year, or two if February 29 falls in between, which is why your birthday rarely lands on the same weekday two years running.<\/p>\n<h2>Calendar notes<\/h2>\n<p>The calculator uses the Gregorian calendar, introduced in 1582 and adopted by Britain and its colonies in 1752. For earlier dates, historians often quote the old Julian calendar, which can differ by 10 or more days.<\/p>\n<p>Related tools: the <a href=\"https:\/\/www.quickonlinetips.com\/archives\/tools\/age-calculator\/\">age calculator<\/a> works out your exact age, <a href=\"https:\/\/www.quickonlinetips.com\/archives\/tools\/days-between-dates\/\">days between dates<\/a> counts the gap between two dates, and the <a href=\"https:\/\/www.quickonlinetips.com\/archives\/tools\/week-number\/\">week number<\/a> tool shows the ISO week for any date.<\/p>\n<h2>FAQ<\/h2>\n<h3>What day of the week was I born?<\/h3>\n<p>Enter your birth date and the answer appears at once. The table also shows the weekday of your birthday in the next few years.<\/p>\n<h3>How often does Friday the 13th happen?<\/h3>\n<p>At least once and at most three times every year. The tool lists the months for the year you pick.<\/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\/week-number\/\"><strong>Week Number<\/strong><span>Today&#8217;s ISO week number and dates for any week.<\/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>This day of the week calculator tells you which weekday any date falls on, from the year 1 to 9999. Check the day you were born, the weekday of a historical event, or whether a future birthday falls on a weekend. It also shows the day of the year, whether the year is a leap&#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-65872","page","type-page","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.quickonlinetips.com\/archives\/wp-json\/wp\/v2\/pages\/65872","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=65872"}],"version-history":[{"count":3,"href":"https:\/\/www.quickonlinetips.com\/archives\/wp-json\/wp\/v2\/pages\/65872\/revisions"}],"predecessor-version":[{"id":66443,"href":"https:\/\/www.quickonlinetips.com\/archives\/wp-json\/wp\/v2\/pages\/65872\/revisions\/66443"}],"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=65872"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}