What is the difference between * and */5 in cron syntax?

An asterisk (*) represents 'every value' (e.g. * in the minute field means execute every minute). A step value like */5 means 'every 5 increments' (e.g. minutes 0, 5, 10, 15, 20, etc.).

Does this tool support 6-field quartz cron expressions?

This tool defaults to standard POSIX crontab 5-field syntax used by Linux crontab, Docker, GitHub Actions, AWS EventBridge, and Node-cron. Support for Quartz 6-field syntax (with leading seconds) is planned.

How do Day-of-Month and Day-of-Week interact when both are specified?

In standard POSIX crontab implementations, if both Day-of-Month and Day-of-Week are non-asterisk values, the job triggers if EITHER condition matches (an OR relationship, not AND).

Cron Expression Generator & Human Translator

Generate, validate, and translate crontab expressions into plain English. Inspect the next 10 execution dates in Local and UTC time.

Capabilities

Key Features

Dual operating modes: Interactive Visual Schedule Builder and Raw Expression Parser
Instant plain-English translation for standard 5-part POSIX crontab syntax
Deterministic calculator computing the next 10 execution dates and relative times
Timezone toggle to review schedules in your Local System Time or Universal UTC
Pinpoint syntax validator checking bounds for minutes (0-59), hours (0-23), and days
Production crontab command generator with standard stdout/stderr logging redirects
One-click schedule presets: Every 5 minutes, Weekday 9 AM, Midnight, and Monthly
100% client-side calculation with zero server logging and complete privacy

Quick Guide

How to use

Choose visual mode or enter an expression

Use the dropdown controls to build a custom interval, or paste an existing cron string (e.g., */15 * * * *) directly.

Review plain-English translation

Read the translated human schedule to ensure the expression matches your exact business cadence and timing requirements.

Examine upcoming execution timestamps

Inspect the list of next 10 scheduled runs to confirm when the job will trigger, verifying timezone alignment between Local and UTC.

Copy expression or crontab command

Click to copy the validated 5-part expression or full crontab syntax ready for deployment in Linux crontab, Kubernetes, or AWS EventBridge.

Technical Guide

About Cron Expression Generator & Human Translator

Cron Expression Generator & Human Translator is an interactive scheduling utility for developers, DevOps engineers, and system administrators. Build 5-part crontab expressions through intuitive visual controls or paste complex existing cron strings for instant plain-English translation. Inspect the upcoming 10 scheduled execution dates in local time and UTC to verify job cadence before deploying to production.

FAQ

Frequently Asked Questions

Standard POSIX crontab strings consist of 5 fields separated by spaces: Minute (0-59), Hour (0-23), Day of Month (1-31), Month (1-12 or JAN-DEC), and Day of Week (0-6 or SUN-SAT, where 0 is Sunday).

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