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<base href="https://bugs.documentfoundation.org/">
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_UNCONFIRMED "
title="UNCONFIRMED - FILEOPEN DBF timestamp fields (type '@') trigger corruption error"
href="https://bugs.documentfoundation.org/show_bug.cgi?id=143715">143715</a>
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<th>Summary</th>
<td>FILEOPEN DBF timestamp fields (type '@') trigger corruption error
</td>
</tr>
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<th>Product</th>
<td>LibreOffice
</td>
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<th>Version</th>
<td>unspecified
</td>
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<th>Hardware</th>
<td>All
</td>
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<th>OS</th>
<td>All
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<th>Status</th>
<td>UNCONFIRMED
</td>
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<th>Severity</th>
<td>normal
</td>
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<th>Priority</th>
<td>medium
</td>
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<th>Component</th>
<td>Calc
</td>
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<th>Assignee</th>
<td>libreoffice-bugs@lists.freedesktop.org
</td>
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<th>Reporter</th>
<td>dev@sheetjs.com
</td>
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<pre>Description:
dBASE Level 7 DBF supports the timestamp field (type '@'). Valid DBF files
generated from dBASE are flagged as corrupt and LibreOffice fails to repair
them
Steps to Reproduce:
1. Download sample file
<a href="https://github.com/SheetJS/test_files/raw/master/dbf/d11.dbf">https://github.com/SheetJS/test_files/raw/master/dbf/d11.dbf</a>
2. open in LibreOffice
Actual Results:
Error message "The file 'd11.dbf' is corrupt and therefore cannot be opened.
LibreOffice can try to repair the file."
Attempting to repair the file yields a new error message "The file 'd11.dbf'
could not be repaired and therefore cannot be opened."
Expected Results:
The file opens properly and the field is interpreted as Date
Reproducible: Always
User Profile Reset: Yes
Additional Info:
SheetJS currently uses the following algorithm to extract values. The
algorithm agrees with dBASE 2019 on the values in the test file:
- Parse the 8 bytes of the field as an IEEE754 double in big-endian order
- Subtract 0x388317533400 (62135683200000, a number that can be exactly
represented in a IEEE754 double)
- Interpret the code as milliseconds since January 1 1970 (which is what JS
uses as the 0 value for the native Date object)</pre>
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