Cron Expression Descriptor
Runs locally in your browser. Nothing leaves your device.Explain, validate, and preview upcoming run times for cron expressions locally.
Expression and dialect
The preview shows calculated intended times. Actual execution depends on the scheduler and its environment.
Description
Enter a cron expression.
Field analysis
Enter a cron expression.
Next runs
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Previous runs
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How it works
- 1
Enter the dialect and expression
Choose the scheduler dialect and enter the cron expression.
- 2
Set the reference time and timezone
Set the reference time, timezone, and the number of executions to display.
- 3
Review the description and preview
Copy the description and execution preview or download them.
Good to know
The cron expression descriptor translates cron expressions into a readable description directly in your browser, matching the chosen scheduler dialect — since cron syntax differs by platform, the dialect must be chosen first. A field-by-field breakdown additionally shows how each individual field of the expression is interpreted.
A preview shows the next and previous executions in a timezone-aware way from a configurable reference time, with a selectable count. Important: the preview shows calculated target times — actual execution depends on the scheduler and its environment, and cron variants differ in seconds fields and weekdays.
Typical use cases
Understand an unfamiliar cron expression from a deployment
Paste a cron expression from a configuration file to instantly get a readable description of the schedule.
Check upcoming execution times for a scheduled job
Set the reference time and timezone to match the target environment, to check a job's calculated upcoming execution times.
Tips for better results
Choose the dialect first, then check the expression
Since cron syntax differs by platform, for example in seconds fields, choose the matching scheduler dialect before interpreting the expression.
Don't mistake the preview for guaranteed execution
The displayed upcoming executions are calculated target times — whether a job actually runs on time depends on the real scheduler and its environment.
Features
Scheduler dialect selection
Choose the matching cron dialect, since syntax differs by platform.
Timezone-aware execution preview
Shows upcoming and previous executions from a configurable reference time and timezone.
Local processing
Your inputs never leave your device; evaluation runs entirely in the browser.
Frequently asked questions
Does the preview guarantee actual execution times?
No. The preview shows calculated target times; actual execution depends on the scheduler and its environment.
Are my inputs uploaded?
No. Evaluation runs entirely locally in the browser.
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