TIMESTAMP is a PYTHON routine which prints the current YMDHMS date (year-month-day-hours-minutes-seconds) as a timestamp.
This is useful when documenting the run of a program. By including a timestamp, the output of the program will always contain a clear indication of when it was created. Other indicators, such as the file modification timestamp, may be misleading or subject to unintentional modification.
TIMESTAMP simply gives the current time. If you are trying to do careful timings of the speed of execution of a computer code, this may not be very accurate, especially on a computer that uses timesharing.
TIMESTAMP is also available in a C version, and a C++ version, and a FORTRAN77 version, and a FORTRAN90 version, and a Mathematica version and a MATLAB version and a PERL version.
You can go up one level to the PYTHON source codes.