time-stamp-inserts-lines

time-stamp-inserts-lines 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 `symbolp'.

Documentation:
Whether M-x time-stamp can change the number of lines in a file.
If nil, M-x time-stamp skips as many lines as there are newlines in
`time-stamp-format' before looking for the `time-stamp-end' pattern,
thus it tries not to change the number of lines in the buffer.
If non-nil, M-x time-stamp starts looking for the end pattern
immediately after the start pattern. This behavior can cause
unexpected changes in the buffer if used carelessly, but it is useful
for generating repeated time stamps.

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