PR:15037 - Unit Tests for 1904 date windowing; submitted by Dan Sherman

git-svn-id: https://svn.apache.org/repos/asf/jakarta/poi/trunk@352937 13f79535-47bb-0310-9956-ffa450edef68

src/testcases/org/apache/poi/hssf/usermodel/TestHSSFCell.java

@@ -77,6 +77,7 @@ import java.util.GregorianCalendar;
  * Tests various functionity having to do with HSSFCell.  For instance support for
  * paticular datatypes, etc.
  * @author Andrew C. Oliver (andy at superlinksoftware dot com)
+ * @author  Dan Sherman (dsherman at isisph.com)
  */
 
 public class TestHSSFCell
@@ -139,6 +140,43 @@ extends TestCase {
             in.close();
     }
 
+    /**
+    * Checks that the recognition of files using 1904 date windowing
+    *  is working properly. Conversion of the date is also an issue,
+    *  but there's a separate unit test for that.
+    */
+    public void testDateWindowing() throws Exception {
+        GregorianCalendar cal = new GregorianCalendar(2000,0,1); // Jan. 1, 2000
+        Date date = cal.getTime();
+        String path = System.getProperty("HSSF.testdata.path");
+
+        // first check a file with 1900 Date Windowing
+        String filename = path + "/1900DateWindowing.xls";
+        FileInputStream stream   = new FileInputStream(filename);
+        POIFSFileSystem fs       = new POIFSFileSystem(stream);
+        HSSFWorkbook    workbook = new HSSFWorkbook(fs);
+        HSSFSheet       sheet    = workbook.getSheetAt(0);
+
+        assertEquals("Date from file using 1900 Date Windowing",
+                        date.getTime(),
+                           sheet.getRow(0).getCell((short)0)
+                              .getDateCellValue().getTime());
+        stream.close();
+        
+        // now check a file with 1904 Date Windowing
+        filename = path + "/1904DateWindowing.xls";
+        stream   = new FileInputStream(filename);
+        fs       = new POIFSFileSystem(stream);
+        workbook = new HSSFWorkbook(fs);
+        sheet    = workbook.getSheetAt(0);
+
+        assertEquals("Date from file using 1904 Date Windowing",
+                        date.getTime(),
+                           sheet.getRow(0).getCell((short)0)
+                              .getDateCellValue().getTime());
+        stream.close();
+    }
+
     public static void main(String [] args) {
         System.out
         .println("Testing org.apache.poi.hssf.usermodel.TestHSSFCell");

src/testcases/org/apache/poi/hssf/usermodel/TestHSSFDateUtil.java

@@ -65,6 +65,7 @@ import java.util.GregorianCalendar;
  *
  *
  * @author
+ * @author  Dan Sherman (dsherman at isisph.com)
  * @version %I%, %G%
  */
 
@@ -95,5 +96,23 @@ public class TestHSSFDateUtil
             assertEquals("Checking hour = " + hour, date.getTime().getTime(),
                          HSSFDateUtil.getJavaDate(excelDate).getTime());
         }
+        
+        // check 1900 and 1904 date windowing conversions
+        double excelDate = 36526.0;
+                 // with 1900 windowing, excelDate is Jan. 1, 2000
+                 // with 1904 windowing, excelDate is Jan. 2, 2004
+        GregorianCalendar cal = new GregorianCalendar(2000,0,1); // Jan. 1, 2000
+        Date dateIf1900 = cal.getTime();
+        cal.add(GregorianCalendar.YEAR,4); // now Jan. 1, 2004
+        cal.add(GregorianCalendar.DATE,1); // now Jan. 2, 2004
+        Date dateIf1904 = cal.getTime();
+        // 1900 windowing
+        assertEquals("Checking 1900 Date Windowing",
+                        dateIf1900.getTime(),
+                           HSSFDateUtil.getJavaDate(excelDate,false).getTime());
+        // 1904 windowing
+        assertEquals("Checking 1904 Date Windowing",
+                        dateIf1904.getTime(),
+                           HSSFDateUtil.getJavaDate(excelDate,true).getTime());
     }
 }