Returns whether a date is a working day, accounting for weekends and public holidays in the given country or subdivision.

Find the first working day after a date.

Find the last working day before a date.

Move a number of working days forward or backward from a date, skipping weekends and public holidays. Use a negative number to count backwards. Zero returns the date unchanged.

Counts the working days between two dates, excluding weekends and public holidays. The range is half-open — the start date counts and the end date does not — so Monday to Tuesday is one working day. The result is negative when the end precedes the start.

Returns the first working day of a given month.

Returns the last working day of a given month.

Works out when a service-level agreement falls due, counting only business hours on working days. If the clock starts outside business hours it waits until the next working day opens. Business hours default to 09:00-17:00 and times are wall-clock in the calendar's own locality.

Checks whether a five-field cron expression is syntactically valid. Parsing only; nothing is scheduled or run.

Translate a five-field cron expression into plain English. Supports ranges, lists, steps, and month or weekday names. This describes the expression; it never schedules or executes anything.

Computes when a five-field cron expression would next fire after a given start time, returning up to 60 timestamps. A pure calculation over the expression: no job is created, stored, or executed.

Check whether an iCalendar recurrence rule (RRULE) is valid and supported. Parsing only; nothing is scheduled.

Describes an iCalendar recurrence rule (RRULE) in plain English. Nothing is scheduled or executed.

Expand an iCalendar recurrence rule (RRULE) into its next occurrences from a start date and time, honouring INTERVAL, COUNT, UNTIL, BYDAY, BYMONTHDAY, and BYMONTH. A pure calculation: it creates no schedule, stores nothing, and runs nothing.