cron
Standard 5-field cron (minute hour day-of-month month day-of-week), evaluated in zone and validated here, at construction. With withSeconds a seconds field is prepended (6 fields). Names (MON, JAN), lists, ranges and steps are supported; Quartz L/W/# operators are not and never will be: complex business calendars are served by the typed DSL. DST behavior matches dailyAt.
Throws
when expression does not parse, naming the offending field.