Parse cron expressions to human-readable schedules
Cron is a time-based job scheduler in Unix-like systems. The cron expression uses five fields: minute (0-59), hour (0-23), day of month (1-31), month (1-12), and day of week (0-7 where 0/7 = Sunday). Special characters include * (any), / (step), , (list), and - (range).