Defined to a number with the release date of allegro.
#include <allegro.h>
#define ALLEGRO_DATE
Defined to an integer containing the release date of Allegro in the packed format `yyyymmdd'. Example:
const int year = ALLEGRO_DATE / 10000; const int month = (ALLEGRO_DATE / 100) % 100; const int day = ALLEGRO_DATE % 100; allegro_message("Year %d, month %d, day %d\n", year, month, day);