Fix writing dates before 1000 year

src/main/java/com/linuxense/javadbf/DBFWriter.java

@@ -319,7 +319,8 @@ private void writeRecord(DataOutput dataOutput, Object[] objectArray) throws IOE
 				if (objectArray[j] != null) {
 					GregorianCalendar calendar = new GregorianCalendar();
 					calendar.setTime((Date) objectArray[j]);
-					dataOutput.write(String.valueOf(calendar.get(Calendar.YEAR)).getBytes(StandardCharsets.US_ASCII));
+					dataOutput.write(DBFUtils.textPadding(String.valueOf(calendar.get(Calendar.YEAR)),
+							StandardCharsets.US_ASCII, 4, DBFAlignment.RIGHT, (byte) '0'));
 					dataOutput.write(DBFUtils.textPadding(String.valueOf(calendar.get(Calendar.MONTH) + 1),
 							StandardCharsets.US_ASCII, 2, DBFAlignment.RIGHT, (byte) '0'));
 					dataOutput.write(DBFUtils.textPadding(String.valueOf(calendar.get(Calendar.DAY_OF_MONTH)),

src/test/java/com/linuxense/javadbf/bug_dates/BugDatesTest.java

@@ -0,0 +1,57 @@
+package com.linuxense.javadbf.bug_dates;
+
+import java.io.File;
+import java.io.FileInputStream;
+import java.io.FileOutputStream;
+import java.io.InputStream;
+import java.io.OutputStream;
+import java.sql.Timestamp;
+import java.util.GregorianCalendar;
+
+import org.junit.Assert;
+import org.junit.Test;
+
+import com.linuxense.javadbf.DBFDataType;
+import com.linuxense.javadbf.DBFField;
+import com.linuxense.javadbf.DBFReader;
+import com.linuxense.javadbf.DBFWriter;
+
+public class BugDatesTest {
+
+	public BugDatesTest() {
+		super();
+	}
+
+	@Test
+	public void test1() throws Exception {
+		File dbfFile = File.createTempFile("dates", ".dbf");
+		try {
+			DBFWriter dbfWriter = new DBFWriter();
+			DBFField field = new DBFField();
+			field.setName("date"); // give a name to the field
+			field.setType(DBFDataType.DATE); // and set its type
+			dbfWriter.setFields(new DBFField[] {field});
+			GregorianCalendar calendar = new GregorianCalendar(2,1,1);
+			Timestamp date = new Timestamp(calendar.getTime().getTime());
+			dbfWriter.addRecord(new Object[] {date});
+
+			OutputStream os = new FileOutputStream(dbfFile);
+			dbfWriter.write(os);
+			dbfWriter.close();
+			os.close();
+
+
+			InputStream is = new FileInputStream(dbfFile);
+			DBFReader reader = new DBFReader(is);
+			Object[] o = reader.nextRecord();
+			is.close();
+			Object value = o[0]; 
+			System.out.println(value);
+			Assert.assertEquals(calendar.getTime(), value);
+		}
+		finally {
+			dbfFile.delete();
+		}
+	}
+
+}