if ($time_iso8601 ~ "^(\d{4})-(\d{2})-(\d{2})T(\d{2}):(\d{2}):(\d{2})") {

set $year $1;

set $month $2;

set $day $3;

set $hour $4;

set $minutes $5;

set $seconds $6;

}

access_log  logs/access_${year}-${month}-${day}_${hour}.log  main;