涉及到跨国项目

时间格式要存时区

北京时区是+8000

Java获取时区或偏移

+8000是偏移

SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss");
//GMT格林威治标准时
Calendar calendar = Calendar.getInstance(TimeZone.getTimeZone("GMT"), Locale.getDefault());
String timeZone = new SimpleDateFormat("Z").format(calendar.getTime());
timeZone = timeZone.substring(0, 3) + ":" + timeZone.substring(3, 5);

System.out.println( format.format(new Date())+timeZone);

2021-01-18T11:15:25+08:00

2021-01-18T11:15:25-05:00