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class=headline-banner__brief>Enter a week number to locate the week on a calendar; or enter any date to see in which week number it falls.</p></div></section></div></div><section class=bn-header__extra><div class=nav-tabs__wrap><div class=fixed><nav class=nav-tabs><a href="/date/duration.html" id=datetabs_duration class=nav-tabs__item title="Find out the number of weeks, days, hours, minutes, and seconds between two dates of your choice.">Count Days</a><a href="/date/dateadd.html" id=datetabs_dateadd class=nav-tabs__item title="Add or subtract any number of days, weeks, months, or years from a date of your choice.">Add Days</a><a href="/date/workdays.html" id=datetabs_workdays class=nav-tabs__item title="Calculate the number of working or non-working days between two dates of your choice.">Workdays</a><a href="/date/weekdayadd.html" id=datetabs_weekdayadd class=nav-tabs__item title="Add or subtract any number of working or non-working days from a date of your choice.">Add Workdays</a><a href="/date/weekday.html" id=datetabs_weekday class=nav-tabs__item title="Find out the day of the week for a date of your choice.">Weekday</a><a href="/date/weeknumber.html" id=datetabs_weeknumber class="nav-tabs__item active" title="Calculate the calendar week number for any date or find out the start and end date for a calendar week of your choice.">Week №</a></nav></div></div></section></header><main class="tpl-banner__main layout-grid layout-grid--sky tpl-banner__main--tools"><article class="layout-grid__main tpl-banner__content"><p class=tpl-banner__abstract></p><div class=tool__wrap><div class=fixed><div class=tool__inner><div class="tool__main twelve columns"><form name=f id=f class="large bg-r pn" onsubmit="return false;" method=get action=""><div class=form-row><div class="five columns"><div class=date-select><div class=left><label for=d1>Day:</label><input tad-va=date placeholder=dd type=text autocomplete=off onfocus="window.ifc&&ifc(this,'d')" pattern="[0-9]*" maxlength=2 size=3 id=d1 name=d1 title="Please enter the day of the month as a one or two-digit number. The valid range is from 1 to 31."><span class=fld-aid> / </span></div><div class=left><label for=m1>Month:</label><input tad-va=date placeholder=mm type=text autocomplete=off onfocus="window.ifc&&ifc(this,'m')" maxlength=12 size=3 id="m1" name="m1" title="Please enter the month of the year as a one or two-digit number, or as a name. The valid numeric range is from 1 to 12, and valid names, for example, are 'Oct' or 'October'."><span class=fld-aid> / </span></div><div class=left><label for=y1>Year:</label><input placeholder=yyyy type=text autocomplete=off tad-va=date onfocus="window.ifc&&ifc(this,'y')" pattern="[0-9]*" maxlength=4 size=5 id=y1 name=y1 title="Enter year as a 4-digit number."></div><div class=left><label>Date:</label><script type="text/javascript"> TAD=window.TAD||{};TAD.dayord="d\/M\/y";TAD.timord="H:m:s";TAD.ftime="HH:mm:ss";TAD.fyear=1753;TAD.lyear=2099;TAD.co="sg";TAD.fdow=0;TAD.dn1=['S','M','T','W','T','F','S'];TAD.fmn=['January','February','March','April','May','June','July','August','September','October','November','December']; </script><button type=button class=btn-datepicker onclick="window.calp&&calp(this,'1')" title="Select date">   </button></div></div><p class=mt5><a href="#" class=bigger title="Set End Date to today's date." onclick="return settoday(1)">Today</a></p><input type=submit name=calcw id=subcalcfromdate value="Calculate Week Number"></div><div class="two columns"><h2 id=label_or>OR</h2></div><div class="five columns"><div class=date-select><div class=left><label for=w2>Week:</label><input type=text pattern="[0-9]*" placeholder=ww maxlength=2 size=4 id=w2 name=w2 title="Enter week number as a 2-digit number." onclick="ifc(this,'w')"><span class=sep-2> / </span></div><div class=left><label for=y2>Year:</label><input placeholder=yyyy type=text tad-va=date onfocus="window.ifc&&ifc(this,'y')" pattern="[0-9]*" maxlength=4 size=5 id=y2 name=y2 title="Enter year as a 4-digit number."></div></div><br><input type=submit name=calcd id=subcalcfromweek value="Calculate Dates"></div><div class="twelve columns"><fieldset id=advanced class="collapse mgb0"><legend>Expand for More Options</legend><div><label for=wncm title="Choose which month the week numbering should begin at">Week Year Start Month:</label><select id=wncm name=wncm><option value=1 selected>January</option><option value=2>February</option><option value=3>March</option><option value=4>April</option><option value=5>May</option><option value=6>June</option><option value=7>July</option><option value=8>August</option><option value=9>September</option><option value=10>October</option><option value=11>November</option><option value=12>December</option></select><label for=wncd title="Choose which date the week numbering should begin at">Week Year Start Date:</label><input tad-va=date placeholder=dd type=text onfocus="window.ifc&&ifc(this,'d')" pattern="[0-9]*" maxlength=2 size=3 id=wncd name=wncd title="Please enter the day of the month as a one or two-digit number. The valid range is from 1 to 31." value=1><label for=wncs title="What is the required numbers of days on/after the start date to start week 1">When does week 1 start:</label><select id=wncs name=wncs><option value=1>Start date above is always week 1</option><option value=2>Week 1 has at least 2 days on/after start date</option><option value=3>Week 1 has at least 3 days on/after start date</option><option value=4 selected>Week 1 has at least 4 days on/after start date</option><option value=5>Week 1 has at least 5 days on/after start date</option><option value=6>Week 1 has at least 6 days on/after start date</option><option value=7>Week 1 is the first full week on/after start date</option></select><label for=fdow>First day of week:</label><select id=fdow name=fdow><option value=0>Use default for country</option><option value=7>Sunday</option><option value=1>Monday</option><option value=2>Tuesday</option><option value=3>Wednesday</option><option value=4>Thursday</option><option value=5>Friday</option><option value=6>Saturday</option></select></div></fieldset></div></div></form><div id=detail class="detail success" style="display:none;"></div> </div></div></div></div><p class="help-link noprint"><a href="/date/weeknumber-help.html"> Need some help?</a></p><div class=row><div class="four columns push-right"><div class="clip-block clip-block--card"><article class="card card card--list card--small"><a href="/ios/datecalculator/" class=card__link aria-label="Time & Date Calculator App for iOS"><div class=card__img-wrap><img src="//c.tadst.com/gfx/ios/app/datecalc-100.png"></div><section class=card__content><h4 class=card__title>Time & Date Calculator App for iOS</h4><p class=card__text>See how long remains before a deadline or exactly when those 30 days are up.</p></section></a></article></div><div class="clip-block clip-block--card"><article class="card card card--list card--small"><a href="/services/calendar-logo.html" class=card__link aria-label="Calendar with Logo (PDF)"><div class=card__img-wrap><img src="//c.tadst.com/gfx/64x64/og-calendar-logo.png?1" width=64 height=64 alt="Illustration image" class=card__img></div><section class=card__content><h4 class=card__title>Calendar with Logo (PDF)</h4><p class=card__text>Add your company logo to our printable calendars.</p></section></a></article></div><article class="card card--list card--small"><a href="https://dev.timeanddate.com/calculator/" class=card__link aria-label="Date Calculator API"><div class=card__img-wrap><img src="//c.tadst.com/gfx/64x64/calc-api.png?1" width=64 height=64 alt="Illustration image" class=card__img></div><section class=card__content><h4 class=card__title>Date Calculator API</h4><p class=card__text>Find a specific business date and calculate the working days in a given period.</p></section></a></article></div><div class="eight columns"><div class=botlnk><h2>Date Calculators</h2><ul><li><a href="/date/timeduration.html">Time and Date Duration</a> – Calculate duration, with both date and time included</li><li><a href="/date/dateadd.html">Date Calculator</a> – Add or subtract days, months, years</li><li><a href="/date/weekday.html">Weekday Calculator</a> – What day is this date?</li><li><a href="/date/birthday.html">Birthday Calculator</a> – Find when you are 1 billion seconds old</li></ul><h2>Related Links</h2><ul><li><a href="/calendar/info.html">Calendar & Holidays Overview</a> – Explore calendar tools</li><li><a href="/calendar/generate.html">Calendar Generator</a> – Create a calendar for any year</li><li><a href="/worldclock/">The World Clock</a> – Current time all over the world</li><li><a href="/countdown/create">Countdown to Any Date</a> – Create your own countdown</li></ul></div></div></div></article><aside class="layout-grid__sky layout-grid__sky--sticky tpl-banner__sky"><fieldset id=ad1><legend>Advertising</legend><div id='div-gpt-com-300x600'><script> AdMgr.dispSlot(0); 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