2.1.7 Working file mtime option ------------------------------- Two commands that mutate the working file (⇒ci, ⇒co) accept an option of the form ‘-M’ or ‘-MREV’. This option works with ‘-u’ or ‘-l’ to specify that the working file’s modification time should be set to the date associated with revision REV (defaults to the branch tip if unspecified). Like ‘-T’, this can be useful when the working file is named in a Makefile target’s list of prerequisites.