java 导入eazyexcel 时间转换

public String convertExcelData(Integer days) {

		double ditNumber = 0.4330324074;

		Date date = getDate(days);

		Date dateTime = getTime(date, ditNumber);

		SimpleDateFormat sdf = new SimpleDateFormat("MM/dd/yyyy");

		return sdf.format(dateTime);

	}

	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();
	}