Microsoft的Java OLE自动化日期转换器

如何将Java日期转换为OADate：

        public static String convertToOADate(Date date) throws ParseException {    double oaDate;    SimpleDateFormat myFormat = new SimpleDateFormat("dd MM yyyy");    Date baseDate = myFormat.parse("30 12 1899");    Long days = TimeUnit.DAYS.convert(date.getTime() - baseDate.getTime(), TimeUnit.MILLISECONDS);    oaDate = (double) days + ((double) date.getHours() / 24) + ((double) date.getMinutes() / (60 * 24)) + ((double)          date.getSeconds() / (60 * 24 * 60));    return String.valueOf(oaDate);    }

如何将OADa​​te转换为Java日期：

public static Date convertFromOADate(double d) throws ParseException {    double  mantissa = d - (long) d;    double hour = mantissa*24;    double min =(hour - (long)hour) * 60;    double sec=(min- (long)min) * 60;    SimpleDateFormat myFormat = new SimpleDateFormat("dd MM yyyy");    Date baseDate = myFormat.parse("30 12 1899");    Calendar c = Calendar.getInstance();    c.setTime(baseDate);    c.add(Calendar.DATE,(int)d);    c.add(Calendar.HOUR,(int)hour);    c.add(Calendar.MINUTE,(int)min);    c.add(Calendar.SECOND,(int)sec);    return c.getTime();}