localtime_rz
return USE_LOCALTIME_RZ ? localtime_rz(gmtz, tp, tmp) : gmtime_r(tp, tmp);
# define my_localtime_rz localtime_rz
tmp = localtime_rz(tz, tp, tmp);
struct tm *newtmp = localtime_rz(tz, &newt, &newtm);
newtmp = localtime_rz(tz, &newt, &newtm);
struct tm *localtime_rz(timezone_t restrict, time_t const *restrict,