f_timestamp

This a Fortran module to get UNIX timestamp from the standard C library function gettimeofday() using iso_c_binding.

This is an early release and it is tested only under Linux x86_64. It must not be used under 32 bits systems.

It provides the function timestamp() without any argument that returns a character string. This string is the count of seconds (since 00:00:00 UTC Thursday 1, January 1970), a dot as separator and 6 digits for microseconds.

Example, this short program, compiled with gfortran compiler at command line (gfortran time_mod.f08 gettimeofday_smod.f08 test.f08):

Program test
   use time,only:timestamp
   print*,timestamp()
end program test

gives something like:

$ ./a.out
 1501688363.955201
$ 

"1501688363.955201" means, in human language:

2017-08-02T15:39:23+00:00 (in ISO 8601)
Wed, 02 Aug 2017 15:39:23 +0000 (in RFC 822, 1036, 1123, 2822)
Wednesday, 02-Aug-17 15:39:23 UTC (in RFC 2822)
2017-08-02T15:39:23+00:00 (in RFC 3339)