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The time-stamp command can be used to update
automatically a template in a file with a new time stamp every
time you save the file. Customize the hook
before-save-hook to add the function
time-stamp to arrange this. It you use Custom to do
this, then time-stamp is conveniently listed as an
option in the customization buffer.
The time stamp is updated only if the customizable variable
time-stamp-active is on, which it is by default; the
command time-stamp-toggle-active can be used to
toggle it. The format of the time stamp is set by the
customizable variables time-stamp-format and
time-stamp-time-zone.
The variables time-stamp-line-limit,
time-stamp-start, time-stamp-end,
time-stamp-count, and
time-stamp-inserts-lines control finding the
template. Do not change these in your init file or you will be
incompatible with other people’s files. If you must change
them, do so only in the local variables section of the file
itself.
Normally the template must appear in the first 8 lines of a file and look like one of the following:
Time-stamp: <> Time-stamp: " "
The time stamp is written between the brackets or quotes:
Time-stamp: <1998-02-18 10:20:51 gildea>