al_get_time - Allegro 5 API

       Return the number of seconds since the Allegro library was initialised.  The return value is undefined if
       Allegro  is  uninitialised.  The resolution depends on the used driver, but typically can be in the order
       of microseconds.

Allegro reference manual                                                                    al_get_time(3alleg5)

       al_get_time - Allegro 5 API

              #include <allegro5/allegro.h>

              double al_get_time(void)