code: public static LocalDateTime localDateTimeUTC( long millis ) {
          CheckArg.isPositive(millis, "millis");
          return LocalDateTime.ofInstant(Instant.ofEpochMilli(millis), UTC);
      }
docs: Creates a new UTC {@link LocalDateTime} instance  based on the given millis value
  
  @param millis a positive amount of millis
  @return a {@link LocalDateTime} instance.