Parse cron expressions to show human-readable descriptions and calculate the next N execution times.
A cron expression compresses a recurring schedule into a few position-dependent fields. Cron Expression Parser separates those fields, interprets wildcards, lists, ranges, and step values, then presents the schedule in plain language and calculates the requested number of future occurrences. The main source of surprise is portability: cron dialects do not all support the same field count or extensions, and time-zone or day-matching rules can make an expression behave differently in the system that ultimately runs it.
In the conventional five-field form, positions represent minute, hour, day of month, month, and day of week, in that order. An asterisk leaves a field unrestricted. Commas select multiple values, hyphens describe ranges, and slashes express intervals within an allowed set. The parser combines these constraints into a human-readable description of the recurring schedule.
The next-times calculation applies the decoded field constraints to future calendar dates and clock times until it has collected the requested number of matches. Its results therefore depend on the evaluation date and the time zone in effect. Changing N changes the length of the preview, while changing any cron field can alter the recurrence itself.
No. The tool only describes the expression and previews future matching times. It does not install a crontab entry, invoke a command, or remain active as a scheduler. You must place the verified expression into the relevant operating system, application, CI service, or orchestration configuration separately.
The parser and scheduler may use different cron dialects, time zones, or rules for matching restricted day-of-month and day-of-week fields. Daylight-saving transitions can also skip or repeat local clock times. Confirm the target scheduler's accepted syntax and time-zone configuration rather than treating a readable description alone as proof of identical behavior.
The behavioral notes were checked against the browser implementation. Standards and primary references below define the relevant format, formula, or platform behavior.
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