/**
* 获取UTC格式的过期时间
* @param expectedExpiredTime 交易过期时间，请换算为分钟
* @return UTC时间
*/
private static String getTradeExpireTime(int expectedExpiredTime) {
SimpleDateFormat formater = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss.SSSZ");
formater.setTimeZone(TimeZone.getTimeZone("UTC"));
Calendar calendar = Calendar.getInstance();
calendar.set(Calendar.MINUTE, calendar.get(Calendar.MINUTE) + expectedExpiredTime);
return formater.format(calendar.getTime());
}