utc时间转毫秒

public class DateUtils {


    private DateUtils() {
    }

    public static final String FORMAT_UTC =  "yyyy-MM-dd'T'HH:mm:ss.SSS'Z'";
 

 
    public static long formatUTCToLong(String utc) throws ParseException {
        SimpleDateFormat sdf = new SimpleDateFormat(FORMAT_UTC);
        Date parse = sdf.parse(utc);
        Calendar calendar = Calendar.getInstance();
        calendar.setTime(parse);
        calendar.set(Calendar.HOUR, calendar.get(Calendar.HOUR) + 8);
        return calendar.getTimeInMillis();
    }

public static void main(String[] args) throws ParseException {
    String FORMAT_UTC =  "yyyy-MM-dd'T'HH:mm:ss.SSS'Z'";
    String utc ="2022-11-15T14:00:08.996Z";
    SimpleDateFormat sdf = new SimpleDateFormat(FORMAT_UTC);
    Date parse = sdf.parse(utc);
    Calendar calendar = Calendar.getInstance();
    calendar.setTime(parse);
    calendar.set(Calendar.HOUR, calendar.get(Calendar.HOUR) + 8);
    System.out.println(formatUTCToLong("2022-11-15T14:00:08.996Z"));
    System.out.println(formatUTCToLong("2022-11-15T14:00:08.997Z"));
    System.out.println(formatUTCToLong("2022-11-15T14:00:09.000Z"));
}

}

输出效果

1668520808996
1668520808997
1668520809000