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      <base href="https://bugs.documentfoundation.org/">
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    <body><span class="vcard"><a class="email" href="mailto:oliver.brinzing@gmx.de" title="Oliver Brinzing <oliver.brinzing@gmx.de>"> <span class="fn">Oliver Brinzing</span></a>
</span> changed
          <a class="bz_bug_link 
          bz_status_UNCONFIRMED "
   title="UNCONFIRMED - FILEOPEN wrong column format in ODS but not XLSX"
   href="https://bugs.documentfoundation.org/show_bug.cgi?id=119509">bug 119509</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>oliver.brinzing@gmx.de
           </td>
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      <p>
        <div>
            <b><a class="bz_bug_link 
          bz_status_UNCONFIRMED "
   title="UNCONFIRMED - FILEOPEN wrong column format in ODS but not XLSX"
   href="https://bugs.documentfoundation.org/show_bug.cgi?id=119509#c3">Comment # 3</a>
              on <a class="bz_bug_link 
          bz_status_UNCONFIRMED "
   title="UNCONFIRMED - FILEOPEN wrong column format in ODS but not XLSX"
   href="https://bugs.documentfoundation.org/show_bug.cgi?id=119509">bug 119509</a>
              from <span class="vcard"><a class="email" href="mailto:oliver.brinzing@gmx.de" title="Oliver Brinzing <oliver.brinzing@gmx.de>"> <span class="fn">Oliver Brinzing</span></a>
</span></b>
        <pre>i can confirm with your attached *.ods test file:

- open attached *.ods file
- format cells B2:B38 with Number Standard
- save
- reload
- B2:B38 has Date format TT.MM.JJ

test file's content.xml stored the date with "MM/DD/YY" format:
<table:table-cell table:style-name="ce1" office:value-type="date"
office:date-value="2018-06-27" calcext:value-type="date">
<text:p>06/27/18</text:p>
</table:table-cell>

and i can reproduce with a new spreadsheet, if i change the 
cell language property from "Default (German)" -> Date Format 
"TT.MM.JJ" to "English (USA)" -> "MM/DD/YY" (direct formatting).

Version: 6.2.0.0.alpha0+ (x64)
Build ID: ae5d6e44ce2310ef3ec4b0d12fe2d0005567a1ef
CPU threads: 4; OS: Windows 10.0; UI render: default; 
Locale: de-DE (de_DE); Calc: threaded

workaround:
- select B2:B38
- context menu: "Clear Direct Formatting"
- save and reload

this will add "table:style-name="Default" to <table:table-cell/> 
elements in "content.xml"</pre>
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