Allegro 5 api
#include <allegro5/allegro.h> time_t al_get_fs_entry_mtime(ALLEGRO_FS_ENTRY *e)
Returns the time in seconds since the epoch since the entry was last modified.
al_get_fs_entry_atime(3alleg5), al_get_fs_entry_ctime(3alleg5), al_update_fs_entry(3alleg5)