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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 - Dates are not correctly auto-extrapolated if exclude days"
   href="https://bugs.documentfoundation.org/show_bug.cgi?id=144377">144377</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>Dates are not correctly auto-extrapolated if exclude days
          </td>
        </tr>

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

        <tr>
          <th>Version</th>
          <td>7.1.5.2 release
          </td>
        </tr>

        <tr>
          <th>Hardware</th>
          <td>All
          </td>
        </tr>

        <tr>
          <th>OS</th>
          <td>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>buggymcbug@bobmail.info
          </td>
        </tr></table>
      <p>
        <div>
        <pre>Created <span class=""><a href="https://bugs.documentfoundation.org/attachment.cgi?id=174887" name="attach_174887" title="File with date set rows demonstrating the issue.">attachment 174887</a> <a href="https://bugs.documentfoundation.org/attachment.cgi?id=174887&action=edit" title="File with date set rows demonstrating the issue.">[details]</a></span>
File with date set rows demonstrating the issue.

The auto-extrapolation of months doesn't work if days are excluded.


If you have a row of fields with dates that exclude:

2019-10
2019-11
2019-12

etc, and you set the date field to ISO 8601, when you ask Calc to guess the
next field, it brings up:

2019-13
2019-14
etc

It's subjective if that's a date given technically ISO 8601 requires the day as
well.

However, if I then do the same thing but specify the field type as user
customised: YYYY-MM - you get the exact same behaviour:
2019-13
2019-14
etc


Expected in both cases is:
2020-01
2020-02
etc</pre>
        </div>
      </p>


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