I put a logrotate configuration file in /etc/logrotate.d/ and expected the logs to rotate at a consistent time; however, they do not... log rotation times are seemingly random +/- one hour.

Why are the log rotation start times random, and how can I change this?

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Informational: my logrotate config file looks like this...

/opt/backups/network/*.conf {
        copytruncate
        rotate 30
        daily
        create 644 root root
        dateext
        maxage 30
        missingok
        notifempty
        compress
        delaycompress
        postrotate
            ## Create symbolic links in daily/
            PATH=`/usr/bin/dirname $1`;
            FILE=`/bin/basename $1`;
            /bin/ln -s $1 $PATH/daily/$FILE
        endscript
}