time-stamp-pattern

time-stamp-pattern is a variable defined in `time-stamp.el'.
Its value is

nil

• This variable is safe as a file local variable if its value
  satisfies the predicate `stringp'.

Documentation:
Convenience variable setting all `time-stamp' location and format values.
This string has four parts, each of which is optional.
These four parts set `time-stamp-line-limit', `time-stamp-start',
`time-stamp-format', and `time-stamp-end'. See the documentation
for each of these variables for details.

The first part is a number followed by a slash; the number sets the number
of lines at the beginning (negative counts from end) of the file searched
for the time stamp. The number and the slash may be omitted to use the
normal value.

The second part is a regexp identifying the pattern preceding the time stamp.
This part may be omitted to use the normal pattern.

The third part specifies the format of the time stamp inserted. See
the documentation for `time-stamp-format' for details. Specify this
part as "%%" to use the normal format.

The fourth part is a regexp identifying the pattern following the time stamp.
This part may be omitted to use the normal pattern.

Examples:
"-10/"
"-9/^Last modified: %%$"
"@set Time-stamp: %:b %:d, %:y$"
"newcommand{\\\\timestamp}{%%}"

Do not change `time-stamp-pattern' `time-stamp-line-limit',
`time-stamp-start', or `time-stamp-end' for yourself or you will be
incompatible with other people's files! If you must change them for
some application, do so only in the local variables section of the
time-stamped file itself.