code: public static FileLastModifiedFilter outside(Calendar onBefore, Calendar onAfter) {
      return outside(onBefore.getTimeInMillis(), onAfter.getTimeInMillis());
    }
docs: Factory method to create an instance of the {@link FileLastModifiedFilter} that evaluates and filters {@link File}s
  based on whether they were last modified before or after a given span of time.
  
  @param onBefore {@link Calendar} used to filter {@link File}'s that were last modified on or before this date/time.
  @param onAfter {@link Calendar} used to filter {@link File}'s that were last modified on or after this date/time.
  @return an instance of the {@link FileLastModifiedFilter}.
  @see java.util.Calendar#getTimeInMillis()
  @see #outside(long, long)