TIMESTAMP is a C library which can print or return the current YMDHMS date 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 timestamp, may be misleading or subject to unintentional modification.
The computer code and data files described and made available on this web page are distributed under the GNU LGPL license.
TIMESTAMP is available in a C version and a C++ version and a FORTRAN77 version and a FORTRAN90 version and a JAVA version and a Mathematica version and a MATLAB version and a PYTHON version.
TIMER, C programs which demonstrate how to compute CPU time or elapsed time.
WTIME, a C library which returns a reading of the wall clock time in seconds.
You can go up one level to the C source codes.