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/* ====================================================================
   Licensed to the Apache Software Foundation (ASF) under one or more
   contributor license agreements.  See the NOTICE file distributed with
   this work for additional information regarding copyright ownership.
   The ASF licenses this file to You under the Apache License, Version 2.0
   (the "License"); you may not use this file except in compliance with
   the License.  You may obtain a copy of the License at

       http://www.apache.org/licenses/LICENSE-2.0

   Unless required by applicable law or agreed to in writing, software
   distributed under the License is distributed on an "AS IS" BASIS,
   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   See the License for the specific language governing permissions and
   limitations under the License.
==================================================================== */

package org.apache.poi.examples.hssf.usermodel;

import java.io.FileOutputStream;
import java.io.IOException;
import java.util.Date;

import org.apache.poi.hssf.usermodel.HSSFCell;
import org.apache.poi.hssf.usermodel.HSSFCellStyle;
import org.apache.poi.hssf.usermodel.HSSFDataFormat;
import org.apache.poi.hssf.usermodel.HSSFRow;
import org.apache.poi.hssf.usermodel.HSSFSheet;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;

/**
 * An example on how to cells with dates.  The important thing to note
 * about dates is that they are really normal numeric cells that are
 * formatted specially.
 */
public class CreateDateCells {
    public static void main(String[] args) throws IOException {
        try (HSSFWorkbook wb = new HSSFWorkbook()) {
            HSSFSheet sheet = wb.createSheet("new sheet");

            // Create a row and put some cells in it. Rows are 0 based.
            HSSFRow row = sheet.createRow(0);

            // Create a cell and put a date value in it.  The first cell is not styled as a date.
            HSSFCell cell = row.createCell(0);
            cell.setCellValue(new Date());

            // we style the second cell as a date (and time).  It is important to create a new cell style from the workbook
            // otherwise you can end up modifying the built in style and effecting not only this cell but other cells.
            HSSFCellStyle cellStyle = wb.createCellStyle();
            cellStyle.setDataFormat(HSSFDataFormat.getBuiltinFormat("m/d/yy h:mm"));
            cell = row.createCell(1);
            cell.setCellValue(new Date());
            cell.setCellStyle(cellStyle);

            // Write the output to a file
            try (FileOutputStream fileOut = new FileOutputStream("workbook.xls")) {
                wb.write(fileOut);
            }
        }
    }
}