包括將世界標準時間轉換為本地時間和將世界標準時間轉換為目標時區的本地時間，以及將本地時間轉換為世界標準時間。

/**
 * @author j.tommy
 * @version 1.0
 * @date 2017/12/10
 */
public final class DateUtil {
    /**
     * 將世界標準時間轉換為本地時間
     * @param gmtDate
     * @return
     */
    public static Date convertGMT2Local(Date gmtDate) {
        Calendar c = Calendar.getInstance();
        c.setTime(gmtDate);
        int
 
 zoneOffset = c.get(Calendar.ZONE_OFFSET);
        int dstOffset = c.get(Calendar.DST_OFFSET);
        c.add(Calendar.MILLISECOND,zoneOffset+dstOffset);
        return c.getTime();
    }
    /**
     * 將世界標準時間轉換為目標時區的本地時間
     * @param gmtDate
     * @param id
     * @return
     */
    public static Date convertGMTToLocal
 
(Date gmtDate, String id) {
        Calendar calendar = Calendar.getInstance(TimeZone.getTimeZone("UTC"));
        calendar.setTime(gmtDate);
        calendar.setTimeZone(TimeZone.getTimeZone(id));
        int zoneOffset = calendar.get(Calendar.ZONE_OFFSET);
        int dstOffset = calendar.get(Calendar.DST_OFFSET);
        calendar.add(Calendar.MILLISECOND, dstOffset+zoneOffset);
        return
 
 calendar.getTime();
    }
    /**
     * 將本地時間轉換為世界標準時間
     * @param date
     * @return
     */
    public static Date convertToGMT(Date date) {
        //Local Time Zone Calendar Instance
        Calendar calendar = Calendar.getInstance();
        calendar.setTime(date);
        int zoneOffset = calendar.get(Calendar.ZONE_OFFSET);
        int dstOffset = calendar.get(Calendar.DST_OFFSET);
        calendar.add(Calendar.MILLISECOND, -(dstOffset+zoneOffset));
        return calendar.getTime();
    }
    public static void main(String[] args) {
        String gmtDateString = "2017-12-10T04:10:01.794Z";
        SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss.SSS'Z'");
        SimpleDateFormat sdf2 = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss.SSS");
        try {
            Date gmtDate = sdf.parse(gmtDateString);
            Date localDate = convertGMT2Local(gmtDate);
            System.out.println(sdf2.format(localDate));
//            for (String id : TimeZone.getAvailableIDs()) {
//                System.out.println(id);
//            }
            localDate = convertGMTToLocal(gmtDate,"Asia/Hong_Kong");
            System.out.println(sdf2.format(localDate));
            gmtDate = convertToGMT(localDate);
            System.out.println(sdf.format(gmtDate));
        } catch (ParseException e) {
            e.printStackTrace();
        }
    }
}