时间的类型的相互转换（date/String）及时区的比较

String ->Date ->String

    @Test
    public void date() throws ParseException{
        String sdate = "01-01-2025";
        SimpleDateFormat sdf = new SimpleDateFormat("dd-MM-yyyy");
        Date date = sdf.parse(sdate);
        System.out.println("--date--"+date);

        sdate = (new SimpleDateFormat("yyyy-MM-dd")).format(date);

        System.out.println("---String---"+sdate);
    }

打印结果：

--date--Wed Jan 01 00:00:00 CST 2025
---String---2025-01-01

XMLGregorianCalendar -> Date -> String

    /**
     * 将Date类转换为XMLGregorianCalendar
     * @param date
     * @return
     */
    public static XMLGregorianCalendar dateToXmlDate(Date date){
            Calendar cal = Calendar.getInstance();
            cal.setTime(date);
            DatatypeFactory dtf = null;
             try {
                dtf = DatatypeFactory.newInstance();
            } catch (DatatypeConfigurationException e) {
            }
            XMLGregorianCalendar dateType = dtf.newXMLGregorianCalendar();
            dateType.setYear(cal.get(Calendar.YEAR));
            //由于Calendar.MONTH取值范围为0~11,需要加1
            dateType.setMonth(cal.get(Calendar.MONTH)+);
            dateType.setDay(cal.get(Calendar.DAY_OF_MONTH));
            dateType.setHour(cal.get(Calendar.HOUR_OF_DAY));
            dateType.setMinute(cal.get(Calendar.MINUTE));
            dateType.setSecond(cal.get(Calendar.SECOND));
            return dateType;
        }   

    /**
     * 将XMLGregorianCalendar转换为Date
     * @param cal
     * @return
     */
    public static Date xmlDate2Date(XMLGregorianCalendar cal){
        return cal.toGregorianCalendar().getTime();
    }

有关TimeZone的计算

/**
     * Convert the string date value to date value.
     *
     * @param format
     *            - Time pattern for this date format.
     * @param dateStr
     *            - String date value to be converted.
     * @return Date value for the input date string.
     */
    public static Date getStrToGMTDate(final String format, final String timeZoneOffset, final String dateStr) throws ParseException {
        Date result = null;
        if (!StringUtils.isEmpty(dateStr)) {
            SimpleDateFormat simpleDateFormat = new SimpleDateFormat();
            TimeZone tz=TimeZone.getTimeZone(TIMEZONE_GMT+timeZoneOffset);
            simpleDateFormat.setTimeZone(tz);
            simpleDateFormat.applyPattern(format);
            simpleDateFormat.setLenient(false);
            result = simpleDateFormat.parse(dateStr);
        }
        return result;
    }

    @Test
    public void date1() {

        String departureDateTimeStr = "2017-05-04 10:00";
        LocalDateTime departureDateTime = LocalDateTime.parse(departureDateTimeStr,
                DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm"));

        ZoneOffset offset = ZoneOffset.of("+08:00");
        long hours = Instant.now().until(departureDateTime.toInstant(offset), ChronoUnit.HOURS);
        // Check if the hour difference is more than 24 hours
        if (hours >= ) {
            System.out.println("----------" + hours);
        }
    }

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参考资料：

http://www.howsoftworks.net/javaapi/java.time/indexlocaldatetime.html

https://docs.oracle.com/javase/8/docs/api/java/time/ZoneOffset.html