Cron Expression Parser

Inspect minute, hour, day, month, and weekday sets locally with Unix/Cronie day-field OR semantics; occurrence calculators are separate tools.

Five-field Unix cron expression

—Minute values

—Hour values

—Month values

—Weekday values

ReadyUnix/Cronie day-of-month/day-of-week OR semantics are used when both fields are restricted.

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.