需要使用到 timeiso8601内嵌变量来获取时间。time_iso8601 内嵌变量来获取时间。timei​so8601内嵌变量来获取时间。time_iso8601格式如下：2018-09-21T16:01:02+02:00。然后使用正则表达式来获取所需时间的数据。

按天分割日志
配置在server段：

if ($time_iso8601 ~ "^(\d{4})-(\d{2})-(\d{2})") {
        set $year $1;
        set $month $2;
        set $day $3;
}
 access_log  /var/logs/xxxx/access/xxxxx_xx_access_$year-$month-$day.log  main;

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查看日志是否生成：

[xx@xxx access]# ll  xxxxx_xx_access_2018-09-21.log 
-rw-r--r-- 1 root root 408848 Sep 21 16:01 xxxxx_xx_access_2018-09-21.log

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按小时、分、秒分割：

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 $6;
}
access_log  /var/logs/xxxx/access/xxxxx_xx_access_$year-$month-$day-hour-minutes-seconds.log  main;

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在必要的时候可以按小时分割,方便日志分析。