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  1. Home
  2. Developer Tools
  3. Cron Expression Parser

Cron Expression Parser

Paste any 5-field cron expression and instantly see what it means in plain English — no more squinting at asterisks and slashes to figure out when a job runs.

What is Cron Expression Parser?

Cron is the standard scheduling syntax used by Unix/Linux cron jobs, CI/CD pipelines, Kubernetes CronJobs, and countless task schedulers. A cron expression packs an entire recurring schedule into five compact fields, which is powerful but famously hard to read at a glance — is "0 */4 * * 1-5" every 4 hours on weekdays, or something else entirely?

This parser breaks a cron expression down field by field and translates it into a plain-English sentence, so you can verify a schedule is correct before deploying it, or quickly understand a schedule someone else wrote without cross-referencing a cron syntax table.

Formula

┌───────────── minute (0-59)
│ ┌───────────── hour (0-23)
│ │ ┌───────────── day of month (1-31)
│ │ │ ┌───────────── month (1-12)
│ │ │ │ ┌───────────── day of week (0-6, Sunday=0)
│ │ │ │ │
* * * * *

How to Calculate

  1. Paste or type a 5-field cron expression into the input.
  2. See each field broken out individually with its meaning.
  3. Read the plain-English translation of the full schedule.
  4. Try a preset button for common schedules like "every hour" or "weekdays at 9 AM".

Example

The expression "0 9 * * 1-5" breaks down to: minute=0, hour=9, every day of month, every month, Monday through Friday — meaning "At 09:00, Monday through Friday."

Key Benefits

  • Instantly translates cryptic cron syntax into plain English
  • Breaks down each of the 5 fields individually for clarity
  • One-click presets for the most common scheduling patterns
  • No sign-up, runs entirely in your browser

Common Mistakes to Avoid

  • Forgetting that day-of-month and day-of-week are OR'd together, not AND'd
  • Mixing up 0-indexed day-of-week (0=Sunday) with 1-indexed conventions from other systems
  • Assuming */7 in the day-of-month field means "every 7 days" — it actually means days 1, 8, 15, 22, 29, restarting each month
  • Forgetting that most cron implementations run in the server's local timezone, not UTC or the user's timezone

Pro Tips

  • When in doubt, test with a very near-future time first to confirm the schedule fires when expected
  • Use ranges (1-5) instead of listing every value with commas when possible, for readability
  • Double check your server or scheduler's timezone setting — this is the most common source of "wrong time" cron bugs
  • For anything more complex than a simple daily/weekly schedule, write out the plain-English description and compare it to your intent before deploying

Key Terms Explained

Cron
A time-based job scheduler used in Unix-like operating systems
Crontab
The file or command used to define a list of cron jobs
Step value
The "/N" syntax meaning "every N units" starting from a field's minimum
CronJob
Kubernetes' native resource for running cron-scheduled tasks

Common Use Cases

  • Verifying a cron schedule before deploying a scheduled task or CI/CD pipeline
  • Understanding a Kubernetes CronJob or serverless scheduled function written by a teammate
  • Debugging why a scheduled job ran (or didn't run) at an unexpected time
  • Learning cron syntax for a sysadmin or DevOps course
  • Auditing existing crontab entries during a server migration

Frequently Asked Questions

What are the 5 fields in a cron expression?
In order: minute (0-59), hour (0-23), day of month (1-31), month (1-12), and day of week (0-6, where 0 is Sunday). A job runs when all five fields match the current time.
What does an asterisk (*) mean in cron syntax?
An asterisk means "every value is allowed" for that field. For example, * in the hour field means the job can run in any hour, effectively meaning that field doesn't restrict the schedule.
What does */5 mean?
The slash denotes a step value. */5 in the minute field means "every 5 minutes" — starting from the field's minimum value and repeating every 5 units.
How do I schedule a job for weekdays only?
Use a range in the day-of-week field: 1-5 represents Monday through Friday. Combined with a specific hour and minute, e.g. "0 9 * * 1-5" runs at 9:00 AM every weekday.

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0
Minute
9
Hour
*
Day (Month)
*
Month
1-5
Day (Week)
In Plain English
At 09:00, on Monday, Tuesday, Wednesday, Thursday, Friday

Common Presets