DateFormat df = new SimpleDateFormat("yyyy-MM-dd‘T‘HH:mm:ss.SSS‘Z‘");
df.setTimeZone(TimeZone.getTimeZone("UTC"));
String timestamp = df.format(new Date());
System.out.println("timestamp = " + timestamp);//timestamp = 2019-06-14T02:05:14.302Z
原文：https://www.cnblogs.com/hujinshui/p/11022466.html