Cron Expression Parser & Next Runs

Parse a 5-field UNIX cron string (minute hour day-of-month month day-of-week), see the next ten run times in your local timezone and UTC, and use presets for common schedules.

Runs in browser

Fields: minute hour dom month dow — Sunday can be 0 or 7 depending on engine; cron-parser follows common UNIX semantics.

Presets

What you get from this cron reader

  • Immediate validation with helpful parser errors when syntax drifts.
  • Readable hints for presets plus room for custom expressions.
  • Ten upcoming executions in both local and UTC clocks for distributed teams.
  • One-click copy of the summary block for tickets or runbooks.

How to read the output

  1. Enter or paste your five cron fields in standard UNIX order.
  2. Use presets to baseline common jobs, then tweak individual fields.
  3. Click parse to refresh the next-ten list whenever you edit the string.
  4. Compare UTC vs local lines when filing incidents across regions.

Ideal workflows

SRE rotations, marketing drip schedules, and data pipeline windows all depend on cron literacy. Document the expression alongside infrastructure code and cross-link automation notes in JSON configs for reproducible releases.

Need human-friendly numbers too?

Combine scheduling math with the scientific and financial calculators when you are estimating runtime budgets or SLA windows.

Works great with these tools

Cron outputs often feed JSON APIs — validate payloads with our free JSON formatter.

Encoding secrets for CI variables? Use our free Base64 encoder alongside schedule checks.

Need quick date offsets or financial math around job windows? Use our free online calculators.

Last updated:

How to use this tool

Cron expressions schedule background jobs on Linux servers, Kubernetes, GitHub Actions, and many SaaS dashboards. Paste a five-field UNIX cron string, confirm it is valid, read what each field means in plain language, and list the next ten run times in your timezone and UTC before deploying to production.

Step 1

Open the Cron Expression Parser and enter the text, URL, file, or settings the tool asks for.

Step 2

Review the options, adjust any settings, and run the tool to generate the result.

Step 3

Check the output, copy or download it if available, and use the related tools below for the next step.

Features

  • Five-field UNIX cron validation with clear errors
  • Plain-language explanation of each schedule part
  • Next ten run times in local timezone and UTC
  • Presets for common schedules like hourly and weekly

Common use cases

  • Validate cron syntax before editing server crontab
  • Explain scheduled jobs to teammates and clients
  • Preview next run times for on-call windows
  • Debug broken automation triggers in CI/CD

Why use this tool?

Cron Expression Parser is built for quick, practical work without making you create an account first. It keeps the interface focused, works on mobile and desktop, and pairs naturally with related ToolsRacks utilities such as JSON Formatter and Robots.txt Generator & Tester.

Frequently asked questions

Common questions people ask before using this tool.

What is a cron expression?

A cron expression is a compact schedule format — usually five fields for minute, hour, day-of-month, month, and day-of-week — that tells a scheduler when to run a job.

How do I check the next cron run time?

Paste a valid expression into the parser and it lists the next ten upcoming executions in your local timezone plus UTC.

Why is my cron expression invalid?

Common issues include wrong field count, values outside allowed ranges, impossible day-of-month and day-of-week combinations, or typos in special characters.

Does this parser support five-field UNIX cron?

Yes. It focuses on the standard five-field UNIX style used by crontab, many Linux servers, and numerous cloud schedulers.

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