java时区时间转换

    
    public static String converDateGMT(String dateStr, String sourceTimeZone, String targetTimeZone) throws ParseException {
        sourceTimeZone = StrUtil.isEmpty(sourceTimeZone) ? GMT_8 : sourceTimeZone;
        targetTimeZone = StrUtil.isEmpty(targetTimeZone) ? GMT_8 : targetTimeZone;
        SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
        //获取传入的时间值
        Long time = new Date(sdf.parse(dateStr).getTime()).getTime();
        //获取源时区时间相对的GMT时间
        Long sourceRelativelyGMT = time - TimeZone.getTimeZone(sourceTimeZone).getRawOffset();
        //GMT时间+目标时间时区的偏移量获取目标时间
        Long targetTime = sourceRelativelyGMT + TimeZone.getTimeZone(targetTimeZone).getRawOffset();
        Date date = new Date(targetTime);
        return DateUtil.formatDateTime(date);
    }