I personally do want to see all the jobs for the day (regardless of visual space constraints). The cat crontab.txt | perl cron-explain.pl [-n 3] output seem odd to me for 21 * * * * job would be running many times over before the next one listed with time of 0,30 6 * * *.

In any case, sooner or later I am bound to change the original to list every single event time from the current time for rest of the current day (default; or, any other date via option).