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    <body><table border="1" cellspacing="0" cellpadding="8">
        <tr>
          <th>Bug ID</th>
          <td><a class="bz_bug_link 
          bz_status_UNCONFIRMED "
   title="UNCONFIRMED - =WEEKNUM(xxx;2) Returns Wrong Week Number for 2021"
   href="https://bugs.documentfoundation.org/show_bug.cgi?id=139548">139548</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>=WEEKNUM(xxx;2) Returns Wrong Week Number for 2021
          </td>
        </tr>

        <tr>
          <th>Product</th>
          <td>LibreOffice
          </td>
        </tr>

        <tr>
          <th>Version</th>
          <td>7.0.4.2 release
          </td>
        </tr>

        <tr>
          <th>Hardware</th>
          <td>x86-64 (AMD64)
          </td>
        </tr>

        <tr>
          <th>OS</th>
          <td>Linux (All)
          </td>
        </tr>

        <tr>
          <th>Status</th>
          <td>UNCONFIRMED
          </td>
        </tr>

        <tr>
          <th>Severity</th>
          <td>normal
          </td>
        </tr>

        <tr>
          <th>Priority</th>
          <td>medium
          </td>
        </tr>

        <tr>
          <th>Component</th>
          <td>Calc
          </td>
        </tr>

        <tr>
          <th>Assignee</th>
          <td>libreoffice-bugs@lists.freedesktop.org
          </td>
        </tr>

        <tr>
          <th>Reporter</th>
          <td>mails.bugs.documentfoundation.org@gunter.ohrner.net
          </td>
        </tr></table>
      <p>
        <div>
        <pre>Description:
If I don't significantly misread all documentation I could find, WEEKNUM does
not work as documented for the year 2021:

<a href="https://help.libreoffice.org/7.0/en-US/text/scalc/01/func_weeknum.html?&DbPAR=WRITER&System=UNIX">https://help.libreoffice.org/7.0/en-US/text/scalc/01/func_weeknum.html?&DbPAR=WRITER&System=UNIX</a>

System 2

<span class="quote">> The week containing the first Thursday of the year is the first week of the
> year, and is numbered week 1. That means that week number 1 of any year is
> the week that contains January 4th. ISO 8601 defines this system and that the
> week starts on Monday.</span >

However:

01.01.21        1       =KALENDERWOCHE(A1;2)
02.01.21        1       =KALENDERWOCHE(A2;2)
03.01.21        1       =KALENDERWOCHE(A3;2)
04.01.21        2       =KALENDERWOCHE(A4;2)
05.01.21        2       =KALENDERWOCHE(A5;2)
06.01.21        2       =KALENDERWOCHE(A6;2)
07.01.21        2       =KALENDERWOCHE(A7;2)


Steps to Reproduce:
1. Use the example data pasted to the description field


Actual Results:
The week containing the 4th of January is counted as "week 2".

Expected Results:
The week containing the 4th of January should be counted as "week 1". That's
what the documentation states, and also what my calendar says...


Reproducible: Always


User Profile Reset: No



Additional Info:
Reproducable in both
* 7.0.4.2 Linux 64 Bit desktop binary
* and LibreOffice 6.4 (Collabora CODE).</pre>
        </div>
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