str_time
static char *str_time(time_t);
str_time((long)m_lftc->sadb_lifetime_addtime));
printf("\tcurrent: %s\n", str_time(tmp_time));
str_time((long)m_lftc->sadb_lifetime_usetime));
str_time((long)m_lftc->sadb_lifetime_addtime));
str_time((long)m_lftc->sadb_lifetime_usetime));