Hello Anatoli, Le jeudi 22 octobre 2020 à 19:23 -0300, Anatoli a écrit : > #if (AC_TYPE(time_t) == "long long int") > #define TIME_T_FMT "%lld" > #elif (AC_TYPE(time_t) == "long int") > #define TIME_T_FMT "%ld" > #else > #error dont know what to use for TIME_T_FMT > #endif Is it not possible to always use "%lld" and always convert the arguments to (long long int)? Best regards, divoplade