code: protected static FileLastModifiedFilter create(RelationalOperator<Long> operator) {
      return new FileLastModifiedFilter() {
        @Override @NullSafe
        public boolean accept(File file) {
          return (file != null && operator.evaluate(file.lastModified()));
        }
      };
    }
docs: Creates an instance of {@link FileLastModifiedFilter} initialized with the provided {@link RelationalOperator},
  which is in the evaluation of the {@link File}s last modified timestamp when {@link #accept(File)} is called.
  
  @param operator {@link RelationalOperator} used to evaluate the {@link File}.
  @return an instance of {@link FileLastModifiedFilter} initialized with the given {@link RelationalOperator}
  used when evaluating the {@link File}.
  @see org.cp.elements.lang.RelationalOperator
  @see FileLastModifiedFilter