New Post: Convert range to table, treat all rows as data rows

Below is the code we use to convert a Range to a DataTable.
We had an issue with certain dateformats being the Julian # of days since 1/1/1900 so this tries to convert those. This also converts RichText to HTML:

public static DataTable RangeToDataTable(IXLRange range, bool firstLineHeadings = true)
{
    if (range.IsMerged())
    {
        range = range.Unmerge(); // Unmerge any merged cells
    }

    DataTable dt = new DataTable();
    // First just do headers (1st row in Range)
    int columnCnt = range.ColumnCount();
    for (int k = 1; k <= columnCnt; k++)
    {
        var name  = range.Row(1).Cell(k).Address.ColumnLetter;
        if (firstLineHeadings) name = range.Row(1).Cell(k).GetString();
        dt.Columns.Add(name);
    }

    bool firstRow = true;
    foreach (var myrow in range.RowsUsed()) // RowsUsed seems to also make merged called all report the same value (which we want)
    {
        if (firstRow && firstLineHeadings) { firstRow = false; continue; }
        if (myrow.IsEmpty()) continue;
        DataRow workRow = dt.NewRow();
        for (int j = 1; j <= columnCnt; j++)
        {
            IXLCell cellObj = myrow.Cell(j); // not 0 based
            var cellValue = cellObj.Value;
            var checkForDate = cellObj.GetFormattedString();
            if (checkForDate.Contains("-yy") && checkForDate.Contains("[$-"))
                cellValue = FromExcelSerialDate(cellValue);
            else
            {
                if (cellObj.HasHyperlink && cellObj.Hyperlink.IsExternal) cellValue = "<a href='" + cellObj.Hyperlink.ExternalAddress + "'>" + cellObj.Value + "</a>";
                if (cellObj.HasRichText) cellValue = RichTextToHTML(cellObj); // If the link is formatted this overwrites with the prettier link
            }
            workRow[j - 1] = cellValue; // 0 based in DataRow object for [] indexing
        }
        dt.Rows.Add(workRow);
    }
    return dt;
}

public static DateTime FromExcelSerialDate(object serialDate)
{
    int excelNumber = int.Parse(serialDate.ToString());
    if (excelNumber > 59) excelNumber -= 1; //Excel/Lotus 2/29/1900 bug   
    return new DateTime(1899, 12, 31).AddDays(excelNumber);
}

public static string RichTextToHTML(IXLCell cell)
{
    StringBuilder myString = new StringBuilder();
    // Special case when the whole cell has a link vs. a http:// string in one of the rich text parts below in the loop
    if (cell.HasHyperlink && cell.Hyperlink.IsExternal) myString.Append("<a href='" + cell.Hyperlink.ExternalAddress + "'>");
    foreach (var richText in cell.RichText)
    {
        myString.Append("<span style='"); // Start SPAN and CSS here then add to it below

        if (richText.Bold) myString.Append("font-weight: bold;");
        if (richText.Strikethrough) myString.Append("text-decoration:line-through;");
        if (richText.Italic) myString.Append("font-style: italic;");
        if (richText.Underline == XLFontUnderlineValues.Single) myString.Append("text-decoration: underline;");
        if (richText.FontName != "Arial") myString.Append("font-face: " + richText.FontName + ";");
        if (richText.FontColor.Color.IsKnownColor) myString.Append("color: " + richText.FontColor.Color.Name + ";");
        if (richText.FontSize != 10) myString.Append("font-size: " + richText.FontSize + ";");
        myString.Append("'>"); // End the SPAN
        if (richText.Text.Contains("http")) myString.Append("<a href='" + richText.Text + "'>");

        myString.Append(richText.Text.Replace("\r\n", "<br>"));
        if (richText.Text.Contains("http")) myString.Append("</a>");
        myString.Append("</span>");
    }
    if (cell.HasHyperlink && cell.Hyperlink.IsExternal) myString.Append("</a>");
    return myString.ToString();
}