Mostly Ruby question: How to change file modification time?

Ruby 3.1.2 Standard Library Documentation says "   touch(list, options = {})

Options: noop verbose

Updates modification time (mtime) and access time (atime) of file(s) in list. Files are created if they don't exist.

  FileUtils.touch 'timestamp'   FileUtils.touch Dir.glob('*.c'); system 'make'

[Source] "