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New FAQ. 

git-svn-id: https://svn.apache.org/repos/asf/jakarta/poi/trunk@352586 13f79535-47bb-0310-9956-ffa450edef68
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Glen Stampoultzis 2002-05-03 00:42:58 +00:00
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@ -42,4 +42,72 @@
at this feel free to add it as a plugin module. We wont be hosting it here however.
</answer>
</faq>
<faq>
<question>
How do you tell if a field contains a date with HSSF?
</question>
<answer>
Excel stores dates as numbers therefore the only way to determine if a cell is
actually stored as a date is to look at the formatting. This solution from
Jason Hoffman:
<p>
Okay, here is a little code I used to determine if the cell was a number or
date, and then format appropriately. I hope it helps. I keep meaning to
submit a patch with the helper method below.... but just haven't had a
chance.
</p>
<source>
/////// code snippet ////////////
case HSSFCell.CELL_TYPE_NUMERIC:
double d = cell.getNumericCellValue();
// test if a date!
if (isCellDateFormatted(cell)) {
// format in form of M/D/YY
cal.setTime(HSSFDateUtil.getJavaDate(d));
cellText =
(String.valueOf(cal.get(Calendar.YEAR))).substring(2);
cellText = cal.get(Calendar.MONTH)+1 + "/" +
cal.get(Calendar.DAY_OF_MONTH) + "/" +
cellText;
}
/////// end code snippet ////////////
// HELPER METHOD BELOW TO DETERMINE IF DATE
// method to determine if the cell is a date, versus a number...
public static boolean isCellDateFormatted(HSSFCell cell) {
boolean bDate = false;
double d = cell.getNumericCellValue();
if ( HSSFDateUtil.isValidExcelDate(d) ) {
HSSFCellStyle style = cell.getCellStyle();
int i = style.getDataFormat();
switch(i) {
// Internal Date Formats as described on page 427 in
// Microsoft Excel Dev's Kit...
case 0x0e:
case 0x0f:
case 0x10:
case 0x11:
case 0x12:
case 0x13:
case 0x14:
case 0x15:
case 0x16:
case 0x2d:
case 0x2e:
case 0x2f:
bDate = true;
break;
default:
bDate = false;
break;
}
}
return bDate;
}
</source>
</answer>
</faq>
</faqs>