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    <body><span class="vcard"><a class="email" href="mailto:rb.henschel@t-online.de" title="Regina Henschel <rb.henschel@t-online.de>"> <span class="fn">Regina Henschel</span></a>
</span> changed
          <a class="bz_bug_link 
          bz_status_RESOLVED  bz_closed"
   title="RESOLVED NOTABUG - LibreOffice counts weeknumbers wrong, starting in 2021..."
   href="https://bugs.documentfoundation.org/show_bug.cgi?id=139342">bug 139342</a>
          <br>
             <table border="1" cellspacing="0" cellpadding="8">
          <tr>
            <th>What</th>
            <th>Removed</th>
            <th>Added</th>
          </tr>

         <tr>
           <td style="text-align:right;">CC</td>
           <td>
                
           </td>
           <td>rb.henschel@t-online.de
           </td>
         </tr>

         <tr>
           <td style="text-align:right;">Resolution</td>
           <td>---
           </td>
           <td>NOTABUG
           </td>
         </tr>

         <tr>
           <td style="text-align:right;">Status</td>
           <td>NEW
           </td>
           <td>RESOLVED
           </td>
         </tr></table>
      <p>
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            <b><a class="bz_bug_link 
          bz_status_RESOLVED  bz_closed"
   title="RESOLVED NOTABUG - LibreOffice counts weeknumbers wrong, starting in 2021..."
   href="https://bugs.documentfoundation.org/show_bug.cgi?id=139342#c4">Comment # 4</a>
              on <a class="bz_bug_link 
          bz_status_RESOLVED  bz_closed"
   title="RESOLVED NOTABUG - LibreOffice counts weeknumbers wrong, starting in 2021..."
   href="https://bugs.documentfoundation.org/show_bug.cgi?id=139342">bug 139342</a>
              from <span class="vcard"><a class="email" href="mailto:rb.henschel@t-online.de" title="Regina Henschel <rb.henschel@t-online.de>"> <span class="fn">Regina Henschel</span></a>
</span></b>
        <pre>The function WEEKNUM has a second parameter to determine, which calculating
system to use. For getting ISO system, you need mode 21.
=WEEKNUM(DATE(2021;1;1);21)
<a href="https://help.libreoffice.org/7.2/en-US/text/scalc/01/func_weeknum.html?DbPAR=CALC#bm_id3159161">https://help.libreoffice.org/7.2/en-US/text/scalc/01/func_weeknum.html?DbPAR=CALC#bm_id3159161</a>

Or you use directly ISOWEEKNUM.
=ISOWEEKNUM(DATE(2021;1;1))
<a href="https://help.libreoffice.org/7.2/en-US/text/scalc/01/func_isoweeknum.html?DbPAR=CALC#bm_id3159161">https://help.libreoffice.org/7.2/en-US/text/scalc/01/func_isoweeknum.html?DbPAR=CALC#bm_id3159161</a></pre>
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