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Cron Expression Translator

Est. read: 7 minDeveloper
Cron fields represented as a schedule grid

Summary

Definition: Cron expressions describe schedules using positional time fields.

Why it matters: Readable translations prevent missed, duplicated, or mistimed jobs.

Pitfall: Assuming all cron runtimes behave the same.

Key terms
Cron
Scheduling format using positional time fields.
Field
One position in a cron string.
Range
Allowed values for a field.
Step
Interval notation like */5.
Timezone
Time context used to evaluate schedules.

Cron is not one standard

This guide focuses on traditional Unix-style cron with five fields.

Cron dialects
Unix
Five fields, OR semantics for day fields.
Quartz
Six or seven fields with special symbols.
Cloud
Often UTC-based with platform rules.

Cron fields and ranges

Field Range
Minute 0-59
Hour 0-23
Day of month 1-31
Month 1-12
Day of week 0-7 (Sun)

Common mix-up: Cron does not evaluate day-of-week and day-of-month as AND in Unix cron.

Special characters

  • * matches any value.
  • , lists multiple values.
  • - defines a range.
  • / sets a step interval.

Quick examples

Example

Runs every day at 03:30 in the system timezone.

Daily schedule
30 3 * * *
Example

Runs at 09:00 Monday through Friday.

Weekdays
0 9 * * 1-5

Why translators matter

Cron expressions are compact but easy to misread. Translators convert fields into human schedules.

Readable output helps catch timezone mistakes and unintended frequency before production.

Use the Cron Expression Translator

  • Paste a cron string into the translator.
  • Review the readable schedule output.
  • Confirm the timezone and runtime.

Before you deploy

Practical check
  • Translate the cron expression.
  • Verify field ranges and steps.
  • Confirm timezone and runtime dialect.

FAQ

Is cron always five fields?
No. Unix cron uses five fields, while Quartz and some cloud systems add seconds or years.

What does 0 0 * * * mean?
Every day at midnight in the scheduler's configured timezone.

Can day-of-week and day-of-month conflict?
In Unix cron they use OR semantics. In Quartz, one field must usually be unspecified.