Java 将Excel中时间数字格式转为指定格式

   在编程过程中经常会遇到时间格式转换的问题，而Excel表格中的时间转换方式不太一样，下面就是转换的代码，再次记录一下

public static Date getDate(int days) {
		Calendar c = Calendar.getInstance();
		c.set(1900, 0, 1);
		c.add(Calendar.DATE, days - 2);
		return c.getTime();
	}

	public static Date getTime(Date date, double ditNumber) {
		Calendar c = Calendar.getInstance();
		int mills = (int) (Math.round(ditNumber * 24 * 3600));
		int hour = mills / 3600;
		int minute = (mills - hour * 3600) / 60;
		int second = mills - hour * 3600 - minute * 60;
		c.setTime(date);
		c.set(Calendar.HOUR_OF_DAY, hour);
		c.set(Calendar.MINUTE, minute);
		c.set(Calendar.SECOND, second);
		return c.getTime();
	}

public static void main(String[] args) throws java.lang.Exception {
		// SimpleDateFormat s = new SimpleDateFormat("yyyy-MM-dd hh:mm:ss");
		// System.out.println(s.format(43188.468333)); Excel数字时间

		int days = 43188;
		double ditNumber = 0.468333;
		Date date =new DateConvert().getDate(days);
		Date dateTime = new DateConvert().getTime(date, ditNumber);
		SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
		System.out.println(sdf.format(dateTime));
               //输出：2018-03-29 11:14:24

	}