cronic

A component of a schedule's field

n => Comp(n, n, 0) n..m => Comp(n, m, 1) n/s => Comp(n, -1, s) n..m/s => Comp(n, m, s)

Invariants:

• min < start < max
• stop < max
• step >= 0

Specification of a recurring event, based on set of date and time filters.

A schedule is considered to happen at a point in time when all its filters are satisfied.

Schedules work up to a precision of seconds.

Notes:

• an empty filter is equivalent to '*' in cron
• contrary to POSIX cron, if weekday and day are set then both must be fulfilled