Build → explain → project → verify
Treat cron as a deployment configuration: confirm dialect, field count, timezone, day-of-month/day-of-week behavior and several future runs before shipping.
Test a specific UTC date-time against parsed minute, hour, day, month, and weekday fields.
Treat cron as a deployment configuration: confirm dialect, field count, timezone, day-of-month/day-of-week behavior and several future runs before shipping.