import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.ss.usermodel.Workbook;
import org.apache.poi.ss.usermodel.Sheet;
import org.apache.poi.ss.usermodel.Row;
import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.ss.usermodel.WorkbookFactory;
import org.apache.poi.openxml4j.exceptions.InvalidFormatException;
import org.apache.poi.ss.usermodel.CellStyle;
import org.apache.poi.ss.usermodel.CreationHelper;
import java.io.*;
import java.util.Calendar;
import java.util.Date;

public class Sample4_1{
  public static void main(String[] args){
    Workbook wb = new HSSFWorkbook();
    Sheet sheet = wb.createSheet();

    sheet.setColumnWidth(0, 4096);
    sheet.setColumnWidth(1, 4096);

    Row row1 = sheet.createRow(1);
    Row row2 = sheet.createRow(2);

    Cell cell1_0 = row1.createCell(0);
    Cell cell1_1 = row1.createCell(1);
    Cell cell2_0 = row2.createCell(0);
    Cell cell2_1 = row2.createCell(1);

    cell1_0.setCellValue(new Date());
    cell1_1.setCellValue(new Date());
    cell2_0.setCellValue(Calendar.getInstance());
    cell2_1.setCellValue(Calendar.getInstance());

    CreationHelper createHelper = wb.getCreationHelper();
    CellStyle cellStyle = wb.createCellStyle();
    short style = createHelper.createDataFormat().getFormat("yyyy/mm/dd h:mm");
    cellStyle.setDataFormat(style);

    cell1_1.setCellStyle(cellStyle);
    cell2_1.setCellStyle(cellStyle);

    FileOutputStream out = null;
    try{
      out = new FileOutputStream("sample4_1.xls");
      wb.write(out);
    }catch(IOException e){
      System.out.println(e.toString());
    }finally{
      try {
        out.close();
      }catch(IOException e){
        System.out.println(e.toString());
      }
    }
  }
}