java 时区转换日期转换：东八区转为UTC零时区

@Test
    public void redd111(){
        System.out.println(toTimeFormatZone0("2023-03-31 13:24:51"));
    }
    public String toTimeFormatZone0(String timeString) {
        if (StringUtils.isBlank(timeString)) {return "";}
        if (timeString.indexOf("T") >0 || timeString.indexOf("Z") >0) {return timeString;}  //原数据本身就是零时区,直接返回
        Date date = null;
        try {
            SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
            ParsePosition pos = new ParsePosition(0);
            date = formatter.parse(timeString, pos);
            SimpleDateFormat sdf8 = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss'Z'");
            sdf8.setTimeZone(TimeZone.getTimeZone("GMT"));//设置时区为0区
            timeString = sdf8.format(date);
        } catch (Exception e) {
            e.printStackTrace();
        }
        return timeString;
    }