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Editorial Team
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Asked: 2026-05-13T13:16:56+00:00

I generate an XML file through C#, and the relevent part looks like this

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I generate an XML file through C#, and the relevent part looks like this

<ss:Cell>
    <ss:Data ss:Type="DateTime">2009-01-18T00:00:00.000</ss:Data>
</ss:Cell>

However it displays in excel as a number , like 41249 that bears no resemblence to the original date. If I right click the cell, and change the format to dd/MM/yyyy or whatever, then it displays the correct date. Anyone know how I can set the format in the XML for how the date is displayed? The data is there, it’s just being displayed incorrectly.

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1 Answer

  1. Editorial Team

    In the <Styles> section add

      <Style ss:ID="s22">
   <NumberFormat ss:Format="yyyy\-mm\-dd"/>
  </Style>

    then mark your cell with the style:

    <Cell ss:StyleID="s22"><Data ss:Type="DateTime">2009-01-21T00:00:00.000</Data></Cell>

    Alternatively, open your XML file in Excel, make the change you want, re-save it as XML, then look to see what changed.

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