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    <p>Cells may have styles. These are uints that index cellXfs in the styleSheet. Each cellXfs item contains a set of attributes. The most important is NumberFormatID. If its value falls in the range 14-22 it is a "standard" date. If it falls in the range 165 - 180, it is a "formatted" date and will have a corresponding NumberingFormat attribute.</p> <h1>Standard Date</h1> <p>[x:c r="A2" s="2"][x:v]38046[/x:v][/x:c]</p> <p>[x:xf numFmtId="14" fontId="0" fillId="0" borderId="0" xfId="0" applyNumberFormat="1" /] (ordinal position 2)</p> <h1>Formatted Date</h1> <p>[x:c r="A4" s="4"][x:v]38048[/x:v][/x:c]</p> <p>[x:xf numFmtId="166" fontId="0" fillId="0" borderId="0" xfId="0" applyNumberFormat="1" /](ordinal position 4)</p> <p>[x:numFmt numFmtId="166" formatCode="m/d;@" /]</p> <p>This code extracts a list of style IDs that correspond to these date formats.</p> <pre><code> private void GetDateStyles() { // // The only way to tell dates from numbers is by looking at the style index. // This indexes cellXfs, which contains NumberFormatIds, which index NumberingFormats. // This method creates a list of the style indexes that pertain to dates. WorkbookStylesPart workbookStylesPart = (WorkbookStylesPart) UriPartDictionary["/xl/styles.xml"]; Stylesheet styleSheet = workbookStylesPart.Stylesheet; CellFormats cellFormats = styleSheet.CellFormats; int i = 0; foreach (CellFormat cellFormat in cellFormats) { uint numberFormatId = cellFormat.NumberFormatId; if ((numberFormatId &gt;= 14 &amp;&amp; numberFormatId &lt;= 22) || (numberFormatId &gt;= 165u &amp;&amp; numberFormatId &lt;= 180u)) { _DateStyles.Add(i.ToString()); } i++; } </code></pre>
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