java获取UTC时间

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/*
        方法一：获取UTC时间
     */
    private static String getUTCDate() {
        String dateStr = "";
        Date date = null;
        String months = "", days = "", hours = "", sec = "", minutes = "";
        DateFormat format = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss'Z'");
        StringBuffer UTCTimeBuffer = new StringBuffer();
        Calendar cal = Calendar.getInstance();
        int zoneOffset = cal.get(java.util.Calendar.ZONE_OFFSET);
        int dstOffset = cal.get(java.util.Calendar.DST_OFFSET);
        cal.add(java.util.Calendar.MILLISECOND, -(zoneOffset + dstOffset));
        int year = cal.get(Calendar.YEAR);
        int month = cal.get(Calendar.MONTH) + 1;
        int day = cal.get(Calendar.DAY_OF_MONTH);
        int hour = cal.get(Calendar.HOUR_OF_DAY);
        int minute = cal.get(Calendar.MINUTE);
        int second = cal.get(Calendar.SECOND);
        if (month < 10) {
            months = "0" + String.valueOf(month);
        }
        else {
            months = String.valueOf(month);
        }
        if (minute < 10) {
            minutes = "0" + String.valueOf(minute);
        }
        else {
            minutes = String.valueOf(minute);
        }
        if (day < 10) {
            days = "0" + String.valueOf(day);
        }
        else {
            days = String.valueOf(day);
        }
        if (hour < 10) {
            hours = "0" + String.valueOf(hour);
        }
        else {
            hours = String.valueOf(hour);
        }
        if (second < 10) {
            sec = "0" + String.valueOf(second);
        }
        else {
            sec = String.valueOf(second);
        }
        UTCTimeBuffer.append(year).append("-").append(months).append("-").append(days);
        UTCTimeBuffer.append("T").append(hours).append(":").append(minutes).append(":").append(sec).append("Z");
        try {
            date = format.parse(UTCTimeBuffer.toString());
            dateStr = format.format(date);
        }
        catch (Exception e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        return dateStr;
    }

    /*
       方法二：获取UTC时间
     */
    public static String getUTCTimeStr(){
        LocalDateTime now = LocalDateTime.now(ZoneOffset.UTC);
        return now.format(DateTimeFormatter.ofPattern("yyyy-MM-dd'T'HH:mm:ss'Z'"));
    }

    public static void main(String[] args) {
        System.out.println(getUTCTimeStr());
        System.out.println("------");
        System.out.println(getUTCDate());
    }