How to create a cron log file in macOS High Sierra

I have cron jobs running, but I'm unable to figure out how to make it create a cron.log file in /var/log. I've edited /etc/syslog.conf file by adding: cron.* /var/log/cron.log and relaunched the syslog daemon, but I still do not get a log file. I've edited the com.vix.cron.plist file and redirected output and error messages to /var/log/cron.log. Even though that works, it is nowhere near being a proper log file with date and time shown.