XLS

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m (Fixed broken link via data.cdlib.org to uc3.cdlib.org ("Abandon all hope, ye who enter dates in Excel"))
(add ForensicsWiki entry link)
 
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* [http://support.microsoft.com/kb/180162 XL: The 1900 Date System vs. the 1904 Date System]
 
* [http://support.microsoft.com/kb/180162 XL: The 1900 Date System vs. the 1904 Date System]
 
* [http://decalage.info/file_formats_security/office MS Office 97-2003 legacy/binary formats security] - article with lots of resources on MS Office formats, including analysis techniques, tools and parsing libraries
 
* [http://decalage.info/file_formats_security/office MS Office 97-2003 legacy/binary formats security] - article with lots of resources on MS Office formats, including analysis techniques, tools and parsing libraries
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== External links ==
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* [https://forensicswiki.xyz/wiki/index.php?title=Excel_Spreadsheet_(XLS) ForensicsWiki entry] (need to copy over whatever relevant details are available)
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[[Category:Microsoft]]
 
[[Category:Microsoft]]
 
[[Category:Microsoft Compound File]]
 
[[Category:Microsoft Compound File]]

Latest revision as of 00:13, 27 November 2020

File Format
Name XLS
Ontology
Extension(s) .xls
MIME Type(s) application/vnd.ms-excel

XLS is a family of spreadsheet formats native to Microsoft Excel.

Contents

[edit] Microsoft Office EXCEL 97-2007

The Excel Binary File Format (.xls) Structure is the binary file format used by Microsoft Excel 97, 2000, 2002, and Office Excel 2003. It is also supported by Microsoft Office Excel 2007.

Later Excel versions use XLSX as their native format, though they still support the older format as well.

[edit] Handling of date values

Excel stores date values as floating point numbers that represent the number of days since a given start date. According to this piece, the default start dates are different for Excel for Windows (which uses January 1, 1900 and) Excel for Mac (which uses January 1, 1904). On top of this, the 1900 date system also erroneously assumes that 1900 was a leap year. This assumption was introduced on purpose in order to ensure compatibility with a bug in Lotus 1-2-3. In practice this may lead to dates that are off by 4 years and 1 day, depending on the software that is used to read/process the files.

[edit] Software

[edit] Sample files

[edit] References

[edit] External links

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