*/30 * * * * perl /path/to/cron_lib/some_worker1
###sample 2014-12-31 00:00:00

0 23 * * * perl /path/to/cron_lib/some_worker2
###sample 2014-12-31 23:00:00

0 15 * * * perl /path/to/cron_lib/some_worker3
