user_id=$(mysql -h$HOST -P$PORT -u$USER -p$PASS$DB -sN -e "SELECT user_id FROM user WHERE user_id = '$username' AND user_pass = SHA1('$password') AND user_enable=1 AND (TO_DAYS(now()) >= TO_DAYS(user_start_date) OR user_start_date='0000-00-00') AND (TO_DAYS(now()) <= TO_DAYS(user_end_date) OR user_end_date='0000-00-00')")