Cron Expression Generator - Cron Builder, Parser & Translator

What This Cron Generator Helps You Do

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Cron syntax is compact, but it is also easy to misread. This page is organized into two tabs that share the same expression:

1. Expression tab — A terminal-style console for editing the raw cron string, with live plain-English translation, next-run previews, preset library, and cheat sheet.
2. Visual Builder tab — A field-by-field builder for composing minute, hour, day, month, and weekday values visually, paired with a field guide that explains each token.

Changes in either tab automatically sync to the other.

Cron Field Order

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OpsKit uses the standard five-field Linux cron format:

1
2
3
4
5
6
7
8

* * * * *
- - - - -
| | | | |
| | | | +--- day of week (0-7, Sunday is 0 or 7)
| | | +----- month (1-12 or JAN-DEC)
| | +------- day of month (1-31)
| +--------- hour (0-23)
+----------- minute (0-59)

How To Use The Page

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1. Start on the Expression tab with a preset or type a cron expression directly into the terminal input.
2. Read the live description and warning box before copying the schedule.
3. Switch to the Visual Builder tab if you want to compose the expression field by field.
4. Check the next-run preview to confirm the schedule behaves the way you expect in your local timezone.

Cron Shortcuts Supported

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The tool understands common aliases and expands them into standard five-field syntax:

• @hourly
• @daily / @midnight
• @weekly
• @monthly
• @yearly / @annually
• @reboot

Common Cron Patterns

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Cron Expression Examples By Use Case

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These examples help when you know the intent but do not yet know the cron syntax. They also improve search relevance for queries such as “every weekday cron”, “monthly cron expression”, and “run every hour cron”.

AI-Assisted Cron Expression Generator

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If you know the schedule you want but do not remember cron syntax, use the built-in AI Assistant on this page as an AI-assisted cron expression generator.

It is useful for prompts like:

• “run every 15 minutes during office hours on weekdays”
• “run at 2 AM on the first day of every month”
• “create a Kubernetes CronJob schedule for every Sunday backup”

The assistant helps translate natural language scheduling requests into cron expressions, while the live preview and parser on the page let you verify the result before you use it.

Why The Next-Run Preview Matters

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The same cron expression can look obvious and still be wrong:

• 0 0 * * 1-5 is weekdays at midnight, not every five days.
• */15 9-17 * * * means every 15 minutes during hours 9 through 17.
• 0 0 31 2 * looks valid syntactically, but there is no February 31st.

Reading the next few scheduled times is the fastest way to catch these mistakes before a production job is deployed.

Cron Aliases vs Standard Expressions

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Aliases are convenient, but standard five-field expressions are easier to compare, debug, and move between systems. This page shows both mental models so you can translate cron syntax faster.

Common Cron Mistakes

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Mixing day of month and day of week

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Many Linux cron implementations treat those two fields with OR semantics. If you fill both, the job can run more often than you expected.

Using 1-5 in the wrong field

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1-5 means a range within a single field, not “every five”. In the weekday field, it means Monday through Friday.

Forgetting local timezone assumptions

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Cron itself does not explain timezone behavior. The preview on this page uses your browser’s local time so you can see what the schedule means where you are reading it.

Writing impossible dates

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Expressions like 0 0 31 2 * look structured but never match because February 31 does not exist.

Privacy

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This tool runs entirely in your browser. OpsKit does not send your cron expressions to a backend for parsing, storage, or logging.

FAQ

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Does this support Quartz or six-field cron?

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No. This page is intentionally focused on the standard five-field Linux cron format used in most crontab-style schedulers.

Does the preview use UTC?

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The next-run preview uses your browser’s local timezone so you can validate schedules the same way you usually read system time on your machine.

Can I type month or weekday names?

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Yes. Named values like JAN, MON, and MON-FRI are supported.

Is there an AI cron expression generator on this page?

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Yes. The built-in AI Assistant can help turn natural-language scheduling requests into cron expressions, and you can then validate the result with the parser and next-run preview.

Related Tools

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• kubectl Builder - useful when cron schedules become Kubernetes CronJobs
• YAML Linter - validate Kubernetes or CI files that embed cron schedules
• DNS Tools - troubleshoot the infrastructure jobs often depend on