Date & time

Cron expression parser with time-zone previews

Explain five-field cron expressions and preview the next eight runs in UTC, Shanghai, New York, London or Tokyo. Includes weekday rules and common pitfalls.

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How to use

Format: minute hour day month weekday. Time zones and daylight saving are supported. Preview the next 8 runs. Restricted day-of-month and weekday fields follow cron OR semantics.

Your input stays yours

Step by step

Enter five fields: minute, hour, day of month, month and weekday.
Select the scheduler’s intended time zone and choose Run.
Review the explanation and next eight times, then compare them with the deployment platform.

Weekdays at 9 AM

0 9 * * 1-5

With Asia/Shanghai selected, this means 09:00 Monday to Friday in that zone. The tool previews schedules without creating jobs or changing servers.

Frequently asked questions

Does it support six fields or Quartz?

Only five-field expressions are accepted, without a seconds field. Do not paste six- or seven-field Quartz expressions directly.

How do restricted day and weekday fields interact?

This tool uses cron OR semantics: either restricted field can match. Implement and verify any requirement for both conditions in the actual scheduling logic.

Can daylight saving time affect the schedule?

Yes. Preview calculations use the selected zone, but platforms can differ in handling missing or repeated local times. Check the actual scheduler; a fixed offset does not replace a named time zone.