Cron Expression Helper

Build a five-field cron expression or explain one you already have.

Up to 200,000 input characters. Output limit: 2,000,000 characters.

Download result

Your input is processed in your browser and is not uploaded to ToolPixels. This tool does not save your input.

How to use it

  1. Paste your input, or load the example.
  2. Enter an expression directly, or choose a preset and select Use builder fields.
  3. Select Explain cron, then review the result.
  4. Copy the result or download cron-expression-helper.txt.

Five-field Unix syntax

Fields are minute, hour, day of month, month and day of week. Numeric values, *, comma lists, ascending ranges and */step or range/step are supported. Sunday is 0 or 7. Names, macros, seconds, years, ?, L, W and # are not supported. With two restricted day fields, either may match; if either begins with *, both must match. Timezone and daylight-saving behavior belong to your scheduler. This helper neither schedules jobs nor guarantees that a calendar combination such as February 31 will occur.

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