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(emacs)Time Stamps

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Updating Time Stamps Automatically
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   You can arrange to put a time stamp in a file, so that it will be
updated automatically each time you edit and save the file.  The time
stamp has to be in the first eight lines of the file, and you should
insert it like this:

     Time-stamp: <>

or like this:

     Time-stamp: ""

   Then add the hook function `time-stamp' to the hook
`write-file-hooks'; that hook function will automatically update the
time stamp, inserting the current date and time when you save the file.
You can also use the command `M-x time-stamp' to update the time stamp
manually.  For other customizations, see the Custom group `time-stamp'.
Note that non-numeric fields in the time stamp are formatted according
to your locale setting (Note: Environment).