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Cron Expression
Generator & Explainer.

Build valid UNIX cron expressions visually. Select quick presets, customize individual fields, and get immediate plain-English translations.

GENERATED CRON EXPRESSION
*/5 * * * *
▹ Every 5 minutes.

Understanding Cron Syntax

Automated background jobs and daemon scheduling rely on deterministic Cron strings. Whether you are orchestrating background data pipelines, cleaning expired cache entries, or dispatching automated reporting agents, clean Cron scheduling prevents server resource spikes.

Each field supports specific wildcard and range characters:

  • * (Asterisk): Matches any possible value in the field.
  • */n (Step): Runs every n units (e.g., */15 in minutes runs every 15 mins).
  • x-y (Range): Runs within an inclusive range (e.g., 1-5 in weekday runs Mon–Fri).
  • x,y (List): Runs at multiple discrete values (e.g., 0,30 in minutes runs at :00 and :30).

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